diff --git a/docs/quality/diagnostic-allowances-linux.json b/docs/quality/diagnostic-allowances-linux.json
index 102b3e6f..cb9ba933 100644
--- a/docs/quality/diagnostic-allowances-linux.json
+++ b/docs/quality/diagnostic-allowances-linux.json
@@ -1,62 +1,6 @@
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@@ -99,13 +36,6 @@
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@@ -323,13 +162,6 @@
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@@ -365,20 +190,6 @@
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@@ -386,34 +197,6 @@
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@@ -533,62 +316,6 @@
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@@ -687,13 +414,6 @@
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@@ -764,34 +477,6 @@
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@@ -836,941 +521,234 @@
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@@ -2740,73 +1515,24 @@
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@@ -2857,27 +1583,6 @@
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@@ -2892,20 +1597,6 @@
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@@ -2969,20 +1660,6 @@
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diff --git a/docs/quality/diagnostic-allowances.json b/docs/quality/diagnostic-allowances.json
index ffa6609a..6ea56695 100644
--- a/docs/quality/diagnostic-allowances.json
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@@ -2738,34 +1506,6 @@
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-      "fingerprint": "ffa2489531b69a28379bccc8278747181e096c43162692ea2da4e8c3a1d1cf9c",
-      "item": "crate::return_home_allowed",
-      "lint": "unreachable_pub",
-      "path": "src/fleet.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "ad907f25e85f19eaa3dd025e471f21d74241f3fc26097b184fce8f7bf1d028b1",
-      "item": "crate::start",
-      "lint": "unreachable_pub",
-      "path": "src/fleet.rs"
-    },
     {
       "count": 1,
       "fingerprint": "d91fa00511a45a2bbe81098aaedd53117257c5fdaf21b07c035c38750757e1a4",
@@ -4879,20 +2819,6 @@
       "lint": "unreachable_pub",
       "path": "src/http.rs"
     },
-    {
-      "count": 1,
-      "fingerprint": "29c0649b53152c989e6cce54f8ff7429712f981515f1a7f8a0bb7cf0f81b25b7",
-      "item": "crate::PostingsCache::install_chunk",
-      "lint": "unreachable_pub",
-      "path": "src/postings_cache.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "cdef6075904a49d749b5537324284772b22a038225271e402fac5d701f1a87a3",
-      "item": "crate::PostingsCache::runs_for",
-      "lint": "unreachable_pub",
-      "path": "src/postings_cache.rs"
-    },
     {
       "count": 1,
       "fingerprint": "2cc4727e49d4e69d488b184fac42dcec24c8b38b9e3e5d041421d83d92f24a7f",
@@ -4907,13 +2833,6 @@
       "lint": "unreachable_pub",
       "path": "src/product.rs"
     },
-    {
-      "count": 1,
-      "fingerprint": "6487b3fbddd2c3343d03313756888a3276394c4cfb7c47863403ff72fd1df099",
-      "item": "crate::QuotaRegistry::admit_append",
-      "lint": "unreachable_pub",
-      "path": "src/quota.rs"
-    },
     {
       "count": 1,
       "fingerprint": "f6269145e7da12ea84288ac84f204a1635a1bc7f8391b9117d01097252cfd7d8",
@@ -4942,13 +2861,6 @@
       "lint": "unreachable_pub",
       "path": "src/registry.rs"
     },
-    {
-      "count": 1,
-      "fingerprint": "267171222ab33983f7c4565129274bd6a6b36290c6126ea4b8a6d5f816e484ef",
-      "item": "crate::RuntimeCaps::with",
-      "lint": "unreachable_pub",
-      "path": "src/runtime.rs"
-    },
     {
       "count": 1,
       "fingerprint": "4a034c08934265d15e51ea98686e48bde353a689522b69fa1ac6c093effa7883",
diff --git a/docs/quality/owners.json b/docs/quality/owners.json
index a9f80e5f..33fc8ed5 100644
--- a/docs/quality/owners.json
+++ b/docs/quality/owners.json
@@ -1815,6 +1815,86 @@
       "path": "src/postings.rs",
       "reason": "Postings codec and span planner tests; compile beside the same private codec in the server, fuzz and invariant harness crates so the owner stays within the file-size limit; no copied codec or public test API.",
       "syntax": "path = \"postings/tests.rs\""
+    },
+    {
+      "category": "effect",
+      "count": 1,
+      "owner": "crate::TouchJournal::start",
+      "path": "src/touch.rs",
+      "reason": "Per-stream touch flusher started under the journal map lock and ended by the journal's own close; no supervisor is reachable at creation and the task owns nothing beyond its journal.",
+      "syntax": "tokio::spawn"
+    },
+    {
+      "category": "effect",
+      "count": 1,
+      "owner": "crate::TaskSupervisor::launch_shutdown",
+      "path": "src/tasks/shutdown.rs",
+      "reason": "The one shutdown driver: it joins the supervised set and publishes the report every observer waits on, so it cannot itself be supervised.",
+      "syntax": "tokio::spawn"
+    },
+    {
+      "category": "effect",
+      "count": 1,
+      "owner": "crate::main",
+      "path": "src/main.rs",
+      "reason": "Process entry reads the Tokio worker floor once before the runtime exists; no service configuration or credentials are inferred.",
+      "syntax": "std::env::var"
+    },
+    {
+      "category": "global",
+      "count": 1,
+      "owner": "crate::reg::M",
+      "path": "src/failpoints.rs",
+      "reason": "The DST failpoint registry: one process-wide lazily initialised map keyed by point and stream name, armed and read only by the DST program; a per-runtime copy would let a parked point outlive the runtime that armed it.",
+      "syntax": "std :: sync :: OnceLock < Registry >"
+    },
+    {
+      "category": "effect",
+      "count": 1,
+      "owner": "crate::reset_refuses_while_in_flight",
+      "path": "src/dst/trace_store_tests/streams.rs",
+      "reason": "Trace-store regression leaks one abandoned list stream on purpose so its lifetime guard never runs and reset must refuse; nothing else escapes the test.",
+      "syntax": "std::mem::forget"
+    },
+    {
+      "category": "unresolved-glob",
+      "count": 1,
+      "owner": "crate",
+      "path": "src/fleet/tests.rs",
+      "reason": "Fleet test module imports its enclosing production owner; the compiler resolves the parent exports and the fixtures pin peer choice, the return-home budget and victim selection.",
+      "syntax": "compiler-resolved import; syntax cannot infer exports"
+    },
+    {
+      "category": "unresolved-glob",
+      "count": 1,
+      "owner": "crate",
+      "path": "src/sse/session/tests.rs",
+      "reason": "SSE session test module imports its enclosing production owner; the compiler resolves the parent exports and the fixtures pin cursor and segment naming.",
+      "syntax": "compiler-resolved import; syntax cannot infer exports"
+    },
+    {
+      "category": "unresolved-glob",
+      "count": 1,
+      "owner": "crate",
+      "path": "src/tenant/tests.rs",
+      "reason": "Tenant test module imports its enclosing production owner; the compiler resolves the parent exports and the fixtures pin the identity grammar.",
+      "syntax": "compiler-resolved import; syntax cannot infer exports"
+    },
+    {
+      "category": "by-path-module",
+      "count": 1,
+      "owner": "crate::tests",
+      "path": "src/tenant.rs",
+      "reason": "Tenant grammar tests; declared by path because the fuzz and invariant harness crates compile the tenant module by path; no copied grammar or public test API.",
+      "syntax": "path = \"tenant/tests.rs\""
+    },
+    {
+      "category": "effect",
+      "count": 1,
+      "owner": "crate::serve",
+      "path": "src/sse/session.rs",
+      "reason": "The SSE driver task is owned by the subscription it drives and ends with the session; a supervised driver would tie a request-scoped task to the runtime supervisor.",
+      "syntax": "tokio::spawn"
     }
   ]
 }
diff --git a/docs/quality/source-allowances.json b/docs/quality/source-allowances.json
index 936f6d92..b74c2129 100644
--- a/docs/quality/source-allowances.json
+++ b/docs/quality/source-allowances.json
@@ -1554,62 +1554,6 @@
       "path": "bench/awsbench/src/main.rs",
       "syntax": "allow (unreachable_code)"
     },
-    {
-      "category": "exception",
-      "count": 1,
-      "owner": "crate::dlq_and_settle",
-      "path": "src/application/consumer/delivery.rs",
-      "syntax": "allow (clippy :: too_many_arguments)"
-    },
-    {
-      "category": "exception",
-      "count": 1,
-      "owner": "crate::ReadPlan < 'a >::segment",
-      "path": "src/application/read.rs",
-      "syntax": "allow (clippy :: too_many_arguments)"
-    },
-    {
-      "category": "exception",
-      "count": 1,
-      "owner": "crate::TEST_ASSERT_KEYED_DENSE",
-      "path": "src/application/read.rs",
-      "syntax": "allow (clippy :: too_many_arguments)"
-    },
-    {
-      "category": "exception",
-      "count": 1,
-      "owner": "crate::read_merged",
-      "path": "src/application/read.rs",
-      "syntax": "allow (clippy :: too_many_arguments)"
-    },
-    {
-      "category": "exception",
-      "count": 1,
-      "owner": "crate::read_stitched",
-      "path": "src/application/read.rs",
-      "syntax": "allow (clippy :: too_many_arguments)"
-    },
-    {
-      "category": "exception",
-      "count": 1,
-      "owner": "crate::WALK_CLOSE_SUBMITS_SNAPSHOT",
-      "path": "src/dst/tests/runtime_sweep.rs",
-      "syntax": "allow (non_snake_case)"
-    },
-    {
-      "category": "exception",
-      "count": 1,
-      "owner": "crate::TraceState::event",
-      "path": "src/dst/trace_store.rs",
-      "syntax": "allow (clippy :: too_many_arguments)"
-    },
-    {
-      "category": "exception",
-      "count": 1,
-      "owner": "crate::read",
-      "path": "src/history/canonical_span.rs",
-      "syntax": "allow (clippy :: too_many_arguments)"
-    },
     {
       "category": "exception",
       "count": 1,
@@ -1729,20 +1673,6 @@
       "path": "src/product.rs",
       "syntax": "allow (clippy :: result_large_err , reason = \"transport boundary returns Axum wire response directly; application errors stay compact\")"
     },
-    {
-      "category": "exception",
-      "count": 1,
-      "owner": "crate",
-      "path": "src/project_policy.rs",
-      "syntax": "allow (dead_code)"
-    },
-    {
-      "category": "exception",
-      "count": 1,
-      "owner": "crate::serve",
-      "path": "src/sse/session.rs",
-      "syntax": "allow (clippy :: too_many_arguments)"
-    },
     {
       "category": "exception",
       "count": 1,
@@ -1988,13 +1918,6 @@
       "path": "src/failpoints.rs",
       "syntax": "std :: sync :: OnceLock < tokio :: sync :: Notify >"
     },
-    {
-      "category": "global",
-      "count": 1,
-      "owner": "crate::reg::M",
-      "path": "src/failpoints.rs",
-      "syntax": "std :: sync :: OnceLock < Mutex < HashMap < (Fp , String) , FpState > > >"
-    },
     {
       "category": "global",
       "count": 1,
@@ -3773,13 +3696,6 @@
       "path": "src/deployment_bearer.rs",
       "syntax": "compiler-resolved import; syntax cannot infer exports"
     },
-    {
-      "category": "unresolved-glob",
-      "count": 1,
-      "owner": "crate::tests",
-      "path": "src/fleet.rs",
-      "syntax": "compiler-resolved import; syntax cannot infer exports"
-    },
     {
       "category": "unresolved-glob",
       "count": 1,
@@ -4151,13 +4067,6 @@
       "path": "src/sse/service.rs",
       "syntax": "compiler-resolved import; syntax cannot infer exports"
     },
-    {
-      "category": "unresolved-glob",
-      "count": 1,
-      "owner": "crate::tests",
-      "path": "src/sse/session.rs",
-      "syntax": "compiler-resolved import; syntax cannot infer exports"
-    },
     {
       "category": "unresolved-glob",
       "count": 1,
@@ -4186,13 +4095,6 @@
       "path": "src/telemetry_batch.rs",
       "syntax": "compiler-resolved import; syntax cannot infer exports"
     },
-    {
-      "category": "unresolved-glob",
-      "count": 1,
-      "owner": "crate::tests",
-      "path": "src/tenant.rs",
-      "syntax": "compiler-resolved import; syntax cannot infer exports"
-    },
     {
       "category": "unresolved-glob",
       "count": 1,
diff --git a/docs/refactor/test-inventory.json b/docs/refactor/test-inventory.json
index f55f8539..9298ee46 100644
--- a/docs/refactor/test-inventory.json
+++ b/docs/refactor/test-inventory.json
@@ -2160,7 +2160,7 @@
     "attributes": [
       "#[tokio::test(flavor = \"current_thread\", start_paused = true)]"
     ],
-    "function_sha256": "ebd8cf2db4bf1a26a03716d8da99e98671cb514d9f8298a69702f50987631166",
+    "function_sha256": "c19966727f38f37212c94748fdbc1737679222c79fa8a2810079c4740890a7c9",
     "mechanisms": [
       "STORE_LATENCY"
     ],
@@ -2811,7 +2811,7 @@
     "attributes": [
       "#[tokio::test(flavor = \"multi_thread\", worker_threads = 4)]"
     ],
-    "function_sha256": "6a83c50969fe771c13aa8f46f7fbbd163ebcf3a12191a9a8c96cd5797ede4a0e",
+    "function_sha256": "b81632e4d007350aa2784b7a0aa34f3358a943f4102aa5d84e63220658d12f78",
     "mechanisms": [],
     "configuration": [],
     "file": "src/dst/tests/livefeed_history.rs",
@@ -4743,18 +4743,6 @@
     "file": "src/dst/trace_store_tests/streams.rs",
     "scenarios": []
   },
-  {
-    "name": "reset_refuses_while_in_flight",
-    "attributes": [
-      "#[tokio::test]",
-      "#[should_panic(expected = \"while operations are active\")]"
-    ],
-    "function_sha256": "8dbca7724f55e7f2f2d9c3a7fdad5701e038a944e2bdd39d259839d152c0ce70",
-    "mechanisms": [],
-    "configuration": [],
-    "file": "src/dst/trace_store_tests/streams.rs",
-    "scenarios": []
-  },
   {
     "name": "restart_invalidates_process_local_touch_cursors",
     "attributes": [
@@ -5535,7 +5523,7 @@
     "attributes": [
       "#[tokio::test(flavor = \"multi_thread\", worker_threads = 4)]"
     ],
-    "function_sha256": "a546f8f58f27f9b678a3b98253c10f7b695e3f7f36ed75f9e2772ae8ee0d0007",
+    "function_sha256": "db24635d68ea5f36ee93262da9a9e3df35767a2f5e3245972145871d0dfecfad",
     "mechanisms": [],
     "configuration": [
       "let store = FaultStore::uniform(inner.clone(), 103, FaultPlan::new(0, 0, 0));"
diff --git a/examples/readertest.rs b/examples/readertest.rs
index bd05a460..eaaf4bcc 100644
--- a/examples/readertest.rs
+++ b/examples/readertest.rs
@@ -52,6 +52,10 @@ impl slatedb::BlockTransformer for TestTransformer {
     clippy::disallowed_methods,
     reason = "main; the example reads its one path argument from the process environment; routing it through the server's configuration would couple an example to the runtime"
 )]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "main; the example nests the scan loop inside the per-range task it times; flattening it would separate the count from the range it measures"
+)]
 async fn main() -> anyhow::Result<()> {
     let path = std::env::args()
         .nth(1)
diff --git a/scripts/quality/mutations.sh b/scripts/quality/mutations.sh
index 245216d4..4860a8f3 100755
--- a/scripts/quality/mutations.sh
+++ b/scripts/quality/mutations.sh
@@ -16,7 +16,7 @@ BASE=$(python3 -c 'import json,sys; print(json.load(open(sys.argv[1]))["merge_ba
 git diff --no-ext-diff --binary --src-prefix="a/$PREFIX" --dst-prefix="b/$PREFIX" "$BASE" -- > "$QUALITY_MUTANTS_OUT/harness-pr.diff"
 TOTAL=0
 REGISTERED=(src/bin/pilot/benchmark.rs src/bin/pilot/benchmark/config.rs src/bin/pilot/benchmark/window.rs src/bin/pilot/generator.rs src/bin/pilot/generator/membership.rs)
-for owner in postings_codec postings batch retained quota cursors queue rollup_allocation rollup_storage tasks touch read_accumulator read_spool shard_directory history_partition ops scaler postings_cache sharddir crypto tail_ring shard bootstrap read_request http_read queue_cleanup transaction_append record; do
+for owner in postings_codec postings batch retained quota cursors queue rollup_allocation rollup_storage tasks touch read_accumulator read_spool shard_directory history_partition ops scaler postings_cache sharddir crypto tail_ring shard bootstrap read_request http_read queue_cleanup transaction_append record tasks_shutdown runtime runtime_telemetry product_cursor quota_registry fleet sse_session; do
   case "$owner" in
     postings_codec) file=src/postings.rs; filter=postings:: ;;
     postings) file=src/postings/validated.rs; filter=postings:: ;;
@@ -41,6 +41,13 @@ for owner in postings_codec postings batch retained quota cursors queue rollup_a
     queue_cleanup) file=src/shard/transaction/queue/cleanup.rs; filter=shard:: ;;
     transaction_append) file=src/shard/transaction/append.rs; filter=shard:: ;;
     record) file=src/shard/record.rs; filter=shard:: ;;
+    fleet) file=src/fleet.rs; filter=fleet:: ;;
+    sse_session) file=src/sse/session.rs; filter="sse:: dst_tests::sse_delivery:: dst_tests::livefeed_swap::" ;;
+    tasks_shutdown) file=src/tasks/shutdown.rs; filter=tasks:: ;;
+    runtime) file=src/runtime.rs; filter=runtime:: ;;
+    runtime_telemetry) file=src/runtime/telemetry.rs; filter=runtime:: ;;
+    product_cursor) file=src/product_cursor.rs; filter=product_cursor:: ;;
+    quota_registry) file=src/quota.rs; filter=quota:: ;;
     postings_cache) file=src/postings_cache.rs; filter=postings_cache:: ;;
     sharddir) file=src/sharddir.rs; filter=sharddir:: ;;
     crypto) file=src/crypto.rs; filter=crypto:: ;;
@@ -55,7 +62,7 @@ for owner in postings_codec postings batch retained quota cursors queue rollup_a
   package=streams-quality-invariants
   mutation_file="$PREFIX$file"
   mutation_diff="$QUALITY_MUTANTS_OUT/harness-pr.diff"
-  if [[ "$owner" == tasks || "$owner" == touch || "$owner" == read_accumulator || "$owner" == read_spool || "$owner" == shard_directory || "$owner" == history_partition || "$owner" == ops || "$owner" == scaler || "$owner" == postings_cache || "$owner" == sharddir || "$owner" == crypto || "$owner" == tail_ring || "$owner" == shard || "$owner" == bootstrap || "$owner" == read_request || "$owner" == http_read || "$owner" == queue_cleanup || "$owner" == transaction_append || "$owner" == record ]]; then
+  if [[ "$owner" == tasks || "$owner" == touch || "$owner" == read_accumulator || "$owner" == read_spool || "$owner" == shard_directory || "$owner" == history_partition || "$owner" == ops || "$owner" == scaler || "$owner" == postings_cache || "$owner" == sharddir || "$owner" == crypto || "$owner" == tail_ring || "$owner" == shard || "$owner" == bootstrap || "$owner" == read_request || "$owner" == http_read || "$owner" == queue_cleanup || "$owner" == transaction_append || "$owner" == record || "$owner" == tasks_shutdown || "$owner" == runtime || "$owner" == runtime_telemetry || "$owner" == product_cursor || "$owner" == quota_registry || "$owner" == fleet || "$owner" == sse_session ]]; then
     # These owners use actual service clocks, task handles and storage types.
     # Keep their code and tests in the service crate without substitute models.
     package=streams-slate
diff --git a/src/application/consumer.rs b/src/application/consumer.rs
index 09c7e2af..4da27524 100644
--- a/src/application/consumer.rs
+++ b/src/application/consumer.rs
@@ -154,6 +154,10 @@ pub(crate) struct AuthorizedConsumerContext {
     record: crate::queue::ConsumerRecord,
 }
 impl ConsumerService {
+    #[expect(
+        clippy::too_many_arguments,
+        reason = "ConsumerService::authorize; authorization takes the tenant, stream, consumer and credential parts separately as the handler parsed them; a request struct would exist only for this signature"
+    )]
     pub(crate) async fn authorize(
         self: &Arc<Self>,
         sref: &crate::tenant::TenantStreamRef,
@@ -439,6 +443,10 @@ async fn load_consumer_record(
     }
 }
 
+#[expect(
+    clippy::too_many_lines,
+    reason = "put; the consumer put validates the configuration, decides create-versus-update and publishes the record in one conditional-write sequence; splitting it would separate the validation from the write it guards"
+)]
 pub(crate) async fn put(
     context: AuthorizedStreamContext,
     doc: ConfigInput,
@@ -647,6 +655,10 @@ pub(crate) struct QueuePosition {
 }
 /// Internal callers provide the incarnation-bound target only after fleet authorization.
 impl ConsumerService {
+    #[expect(
+        clippy::too_many_arguments,
+        reason = "ConsumerService::sweep_local; the local sweep takes the descriptor, segment, consumer and generation parts separately as the sweep resolved them; a sweep struct would exist only for this signature"
+    )]
     pub(crate) async fn sweep_local(
         &self,
         target: InternalTarget,
@@ -698,6 +710,10 @@ impl ConsumerService {
             }
         }
     }
+    #[expect(
+        clippy::unwrap_used,
+        reason = "ConsumerService::queue_position; a poisoned stream state may hold a half-advanced durable frontier; recovering it could report a queue position past a length never made durable"
+    )]
     pub(crate) async fn queue_position(
         &self,
         target: InternalTarget,
diff --git a/src/application/consumer/deletion.rs b/src/application/consumer/deletion.rs
index 739bbbf0..0713dcd1 100644
--- a/src/application/consumer/deletion.rs
+++ b/src/application/consumer/deletion.rs
@@ -9,6 +9,14 @@ use crate::application::consumer_remote::relay_sweep_segment;
 use crate::application::read_remote::InternalTarget;
 use std::sync::Arc;
 
+#[expect(
+    clippy::too_many_arguments,
+    reason = "delete; consumer deletion takes the tenant, stream, consumer, generation and fencing parts separately as the handler resolved them; a delete struct would exist only for this signature"
+)]
+#[expect(
+    clippy::too_many_lines,
+    reason = "delete; the fence, the tombstone and the per-segment cleanup are one deletion whose resumption depends on which step landed; splitting them would separate the steps from the resumption they order"
+)]
 pub(crate) async fn delete(
     state: Arc<ConsumerService>,
     sref: crate::tenant::TenantStreamRef,
@@ -160,6 +168,10 @@ pub(crate) async fn delete(
     })
 }
 
+#[expect(
+    clippy::too_many_lines,
+    reason = "resume_deletion; resumption replays the per-segment cleanup a fenced deletion left behind in the order the debt records; splitting it would separate the steps from the debt that orders them"
+)]
 async fn resume_deletion(
     context: AuthorizedDeletionContext,
 ) -> Result<DeleteOutcome, ConsumerFailure> {
diff --git a/src/application/consumer/delivery.rs b/src/application/consumer/delivery.rs
index 26f27ee6..ba419b92 100644
--- a/src/application/consumer/delivery.rs
+++ b/src/application/consumer/delivery.rs
@@ -11,6 +11,14 @@ use bytes::Bytes;
 use serde_json::json;
 use std::sync::Arc;
 
+#[expect(
+    clippy::too_many_lines,
+    reason = "pull; the pull walks the lineage oldest-first and each segment's skip, stop and deliver verdicts depend on the walk so far; splitting it would separate the verdicts from the walk that orders them"
+)]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "pull; the walk nests each foreign segment's drain probe and each sealed segment's cursor check inside the lineage loop; flattening it would separate the skip from the segment it skips"
+)]
 pub(crate) async fn pull(
     context: AuthorizedConsumerContext,
     doc: PullInput,
@@ -210,6 +218,10 @@ pub(crate) async fn pull(
     }
 }
 
+#[expect(
+    clippy::too_many_arguments,
+    reason = "foreign_segment_drained; the probe takes the descriptor, segment, consumer, generation, sealed end and owner separately as the walk resolved them; a probe struct would exist only for this signature"
+)]
 async fn foreign_segment_drained(
     state: &Arc<ConsumerService>,
     desc: &StreamDesc,
@@ -238,6 +250,7 @@ async fn foreign_segment_drained(
 
 /// Encode only leases granted by the committer, with the same key, stream
 /// epoch, segment and consumer generation used for the durable Receive.
+#[derive(Clone, Copy)]
 struct MessageContext<'a> {
     desc: &'a StreamDesc,
     key: &'a crate::crypto::StreamKey,
@@ -393,6 +406,10 @@ async fn read_coverage(
     })
 }
 
+#[expect(
+    clippy::too_many_lines,
+    reason = "settle; settlement decides the acknowledged, released, dead-lettered and expired outcomes against one durable Receive; splitting it would separate the outcomes from the leases they settle"
+)]
 pub(crate) async fn settle(
     context: AuthorizedConsumerContext,
     doc: SettleInput,
@@ -573,7 +590,18 @@ pub(crate) async fn settle(
 }
 
 // Preserve the explicit source incarnation and one bounded poisoned segment.
-#[allow(clippy::too_many_arguments)]
+#[expect(
+    clippy::too_many_arguments,
+    reason = "dlq_and_settle; the dead-letter path takes the stream, consumer, key, epoch, identity, route and segment separately as settlement resolved them; a context struct would exist only for this signature"
+)]
+#[expect(
+    clippy::too_many_lines,
+    reason = "dlq_and_settle; the dead-letter appends and the settlement of the poisoned leases are one bounded sequence over the same leases; splitting it would separate the appends from the leases they release"
+)]
+#[expect(
+    clippy::expect_used,
+    reason = "dlq_and_settle; the dead-letter target's incarnation was checked before any message is appended; a second fallible read would add a branch no configured target reaches"
+)]
 async fn dlq_and_settle(
     state: &Arc<ConsumerService>,
     desc: &StreamDesc,
@@ -676,12 +704,14 @@ async fn dlq_and_settle(
                 ts_hint_ms: None,
                 key_version: 0,
             };
-            if let Err(error) = state.append.execute(command).await {
-                if error.definitively_rejected() {
+            match state.append.execute(command).await {
+                Ok(_) => {}
+                Err(error) if error.definitively_rejected() => {
                     blocked += 1;
                     tracing::warn!(stream=%desc.name,consumer=%cname,dead_letter_stream=%dlq,error=%error,"dead-letter delivery refused; source lease retained");
+                    continue;
                 }
-                continue;
+                Err(_) => continue,
             }
         }
         let engine = match state.engine_for(&route).await {
diff --git a/src/application/consumer_remote.rs b/src/application/consumer_remote.rs
index 7c6c0aa7..fa339250 100644
--- a/src/application/consumer_remote.rs
+++ b/src/application/consumer_remote.rs
@@ -4,6 +4,14 @@ use crate::application::read_remote::InternalTarget;
 use serde_json::json;
 use std::sync::Arc;
 
+#[expect(
+    clippy::too_many_arguments,
+    reason = "relay_queue_cursor; the relay takes the owner, stream, consumer, generation and segment parts separately as the pull resolved them; a relay struct would exist only for this signature"
+)]
+#[expect(
+    clippy::expect_used,
+    reason = "relay_queue_cursor; a fleet GET request carries no streaming body, so it is clonable; a fallible clone would add a branch no fleet request reaches"
+)]
 pub(super) async fn relay_queue_cursor(
     state: &Arc<ConsumerService>,
     base: &str,
@@ -37,6 +45,14 @@ pub(super) async fn relay_queue_cursor(
     Some((v["cursor"].as_u64()?, v["tail"].as_u64()?))
 }
 
+#[expect(
+    clippy::too_many_arguments,
+    reason = "relay_sweep_segment; the relay takes the owner, stream, consumer, generation and segment parts separately as the sweep resolved them; a relay struct would exist only for this signature"
+)]
+#[expect(
+    clippy::expect_used,
+    reason = "relay_sweep_segment; a fleet sweep request carries no streaming body, so it is clonable; a fallible clone would add a branch no fleet request reaches"
+)]
 pub(super) async fn relay_sweep_segment(
     state: &Arc<ConsumerService>,
     base: &str,
diff --git a/src/application/creation.rs b/src/application/creation.rs
index c4bad873..8c18e00c 100644
--- a/src/application/creation.rs
+++ b/src/application/creation.rs
@@ -148,6 +148,10 @@ fn init_claim_stale(desc: &crate::registry::PersistedDescriptor) -> bool {
         .as_ref()
         .is_some_and(|init| now_ms() - init.claimed_ms > crate::registry::INIT_CLAIM_MS)
 }
+#[expect(
+    clippy::too_many_arguments,
+    reason = "create_request_hash; the request hash covers every field a client can vary, taken separately as the handler parsed them; a request struct would exist only to be hashed"
+)]
 pub(crate) fn create_request_hash(
     content_type: &str,
     ttl_secs: Option<u64>,
@@ -181,6 +185,10 @@ pub(crate) fn create_request_hash(
     }
     hex(&h.finalize()[..16])
 }
+#[expect(
+    clippy::too_many_arguments,
+    reason = "fresh_desc; a fresh descriptor is built from the resolved name, epoch, policy and fork parts separately as creation decided them; a builder would restate the descriptor's own fields"
+)]
 pub(crate) fn fresh_desc(
     service: &CreationService,
     sref: &crate::tenant::TenantStreamRef,
@@ -220,6 +228,10 @@ pub(crate) fn fresh_desc(
     }
 }
 
+#[expect(
+    clippy::expect_used,
+    reason = "json_entries; a serde_json::Value serialises infallibly; a fallible path would add a branch no value reaches"
+)]
 pub(crate) fn json_entries(body: &[u8], allow_empty_array: bool) -> Result<Vec<Bytes>, String> {
     let v: serde_json::Value =
         serde_json::from_slice(body).map_err(|_| "invalid JSON body".to_string())?;
@@ -250,6 +262,10 @@ mod tests {
     use crate::application::request_work::{Action, Key, Kind, RequestWork, WorkError};
     use std::{sync::Arc, time::Duration};
 
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "r05_cancelled_ttl_attempt_releases_only_its_owned_slot; the fixture nests the drain wait inside the timeout that bounds it inside the test; flattening it would separate the wait from the bound it must respect"
+    )]
     #[tokio::test]
     async fn r05_cancelled_ttl_attempt_releases_only_its_owned_slot() {
         let project = crate::tenant::ProjectId::new("creation-test").unwrap();
diff --git a/src/application/creation/anchor.rs b/src/application/creation/anchor.rs
index 34d81b33..8db86589 100644
--- a/src/application/creation/anchor.rs
+++ b/src/application/creation/anchor.rs
@@ -3,6 +3,10 @@ use super::deletion::release_fork_ref;
 use super::raw::CreatePlan;
 use super::*;
 
+#[expect(
+    clippy::too_many_lines,
+    reason = "install; the anchor install is one conditional write over the source's fork reference plus the compensation each declined outcome requires; splitting it would separate the write from the compensation it orders"
+)]
 pub(super) async fn install(
     state: &Arc<CreationService>,
     plan: &CreatePlan,
@@ -187,6 +191,10 @@ enum ReferenceStamp {
     AlreadyPresent,
     TargetChanged,
 }
+#[expect(
+    clippy::expect_used,
+    reason = "stamp_fork_reference; the persisted copy carries the fork reference the match just observed; a fallible write would add a branch no observed reference reaches"
+)]
 fn stamp_fork_reference(current: &StreamDesc, fork_id: &str) -> Mutation<ReferenceStamp> {
     if current.deleted {
         return Mutation::Decline(ReferenceStamp::TargetChanged);
diff --git a/src/application/creation/claim.rs b/src/application/creation/claim.rs
index 4c02842a..63bfb519 100644
--- a/src/application/creation/claim.rs
+++ b/src/application/creation/claim.rs
@@ -2,6 +2,10 @@
 use super::raw::CreatePlan;
 use super::*;
 
+#[expect(
+    clippy::too_many_lines,
+    reason = "resolve; claim resolution is one decision over the existing descriptor's lifecycle, retained name and pending initialization; splitting it would separate the verdicts from the descriptor they judge"
+)]
 pub(super) async fn resolve(
     state: &Arc<CreationService>,
     plan: &CreatePlan,
diff --git a/src/application/creation/deletion.rs b/src/application/creation/deletion.rs
index 465d6b59..80e536a6 100644
--- a/src/application/creation/deletion.rs
+++ b/src/application/creation/deletion.rs
@@ -65,6 +65,10 @@ pub(super) async fn clear_parent_debt(
     state.registry.invalidate(sref);
     Ok(())
 }
+#[expect(
+    clippy::too_many_lines,
+    reason = "release_fork_ref; one conditional write over the source's fork reference whose absent, foreign, recreated-source and released outcomes each decide conclusiveness; splitting it would separate the read from the verdict it justifies"
+)]
 pub(super) fn release_fork_ref(
     state: &Arc<CreationService>,
     src_ref: crate::tenant::TenantStreamRef,
@@ -253,7 +257,6 @@ fn delete_lifecycle(
     // the deployment tenant's same-named stream while B's own survived.
     let state = state.clone();
     let sref = sref.clone();
-    let name = sref.name().as_str().to_string();
     Box::pin(async move {
         let d = match state.registry.get(&sref).await.map_err(|e| e.to_string())? {
             Some(d) => d,
@@ -268,71 +271,7 @@ fn delete_lifecycle(
         // generation that was tombstoned but never released its own
         // parent is reachable by deleting it again.
         if let crate::registry::Lifecycle::Deleted { parent_ref_pending } = d.lifecycle() {
-            if parent_ref_pending && let Some((src, fid, sep)) = parent.clone() {
-                // Clear the debt only on a CONCLUSIVE release: an
-                // absent reference on a live source may still be
-                // installed by a creator in flight, and this very
-                // retry is what repairs that crash later. A source
-                // recreated since the fork is conclusive too — the
-                // incarnation this debt was owed to is gone.
-                if release_fork_ref(&state, d.ref_in_project(&src), &fid, &sep).await? {
-                    clear_parent_debt(&state, &d.sref(), &d.stream_epoch, Some((&src, &fid)))
-                        .await?;
-                }
-            }
-            // Then walk UP. A crashed cascade leaves the debt on a
-            // hidden intermediate generation, and the only request a
-            // client will ever retry is the original delete of the leaf.
-            // Repairing only this descriptor left the ancestor pinned
-            // and reported success.
-            // Each hop resolves in the project of the descriptor that
-            // HOLDS the reference (chain-invariant today, structurally
-            // per-hop).
-            let mut next = d.forked_from.as_ref().map(|f| d.ref_in_project(&f.source));
-            for _ in 0..64 {
-                let Some(anc_ref) = next else { break };
-                let Some(anc) = state
-                    .registry
-                    .get(&anc_ref)
-                    .await
-                    .map_err(|e| e.to_string())?
-                else {
-                    break;
-                };
-                if !(anc.deleted && anc.parent_ref_pending) {
-                    break;
-                }
-                let conclusive = match anc.forked_from.as_ref() {
-                    Some(gp) => {
-                        release_fork_ref(
-                            &state,
-                            anc.ref_in_project(&gp.source),
-                            &gp.fork_id,
-                            &gp.source_epoch,
-                        )
-                        .await?
-                    }
-                    None => true,
-                };
-                if conclusive {
-                    let debt = anc
-                        .forked_from
-                        .as_ref()
-                        .map(|gp| (gp.source.clone(), gp.fork_id.clone()));
-                    clear_parent_debt(
-                        &state,
-                        &anc_ref,
-                        &anc.stream_epoch,
-                        debt.as_ref().map(|(a, b)| (a.as_str(), b.as_str())),
-                    )
-                    .await?;
-                }
-                next = anc
-                    .forked_from
-                    .as_ref()
-                    .map(|g| anc.ref_in_project(&g.source));
-            }
-            return Ok(());
+            return repair_tombstone(&state, &d, parent_ref_pending).await;
         }
         // Soft-versus-hard is decided INSIDE the CAS, against the
         // children the descriptor has at that instant. Deciding it from
@@ -344,7 +283,7 @@ fn delete_lifecycle(
         // The debt is recorded in the SAME write as the tombstone, so a
         // crash between them is impossible.
         #[cfg(test)]
-        crate::failpoints::pause_delete_before_decision(&name).await;
+        crate::failpoints::pause_delete_before_decision(sref.name().as_str()).await;
         let epoch = d.stream_epoch.clone();
         // Round-22 item 7: ONE logical close instant, decided here,
         // stamped into the tombstone write below and used by every
@@ -389,27 +328,7 @@ fn delete_lifecycle(
         // committer queue is backpressure, never a silent drop; a
         // submission that still fails is safe because the debt lives
         // on the tombstone and the sweep reconciler retries it.
-        {
-            let seg_ids: Vec<u32> = d
-                .segments
-                .as_ref()
-                .map(|m| m.segments.iter().map(|sg| sg.seg_id).collect())
-                .unwrap_or_else(|| vec![0]);
-            for sid in seg_ids {
-                let identity = d.dynamic_segment_identity(sid);
-                let route = d
-                    .segment_route_by_id(sid)
-                    .expect("segment selected from validated topology");
-                if let Ok(engine) = state.resolve(&route).await
-                    && let Err(e) = engine.submit_billing_close(identity, close_stamp).await
-                {
-                    tracing::warn!(
-                        "delete {name}: billing close submit failed \
-                             (tombstone debt persists; sweep retries): {e}"
-                    );
-                }
-            }
-        }
+        submit_billing_closes(&state, &d, close_stamp).await;
         if let Some((src, fid, sep)) = parent {
             // Released CONCLUSIVELY: the tombstone owes nothing more.
             // This is `update`, not `cas_update`, because the
@@ -433,6 +352,116 @@ enum DeleteTransition {
     Retained,
     Tombstoned,
 }
+/// Pay a tombstone's unpaid parent debt, then walk UP the fork chain: a
+/// crashed cascade leaves the debt on a hidden intermediate generation, and
+/// the only request a client will ever retry is the original delete of the
+/// leaf, so repairing only its descriptor left the ancestor pinned.
+async fn repair_tombstone(
+    state: &Arc<CreationService>,
+    d: &StreamDesc,
+    parent_ref_pending: bool,
+) -> Result<(), String> {
+    let parent = d
+        .forked_from
+        .as_ref()
+        .map(|f| (f.source.clone(), f.fork_id.clone(), f.source_epoch.clone()));
+    if parent_ref_pending && let Some((src, fid, sep)) = parent {
+        // Clear the debt only on a CONCLUSIVE release: an
+        // absent reference on a live source may still be
+        // installed by a creator in flight, and this very
+        // retry is what repairs that crash later. A source
+        // recreated since the fork is conclusive too — the
+        // incarnation this debt was owed to is gone.
+        if release_fork_ref(state, d.ref_in_project(&src), &fid, &sep).await? {
+            clear_parent_debt(state, &d.sref(), &d.stream_epoch, Some((&src, &fid))).await?;
+        }
+    }
+    // Then walk UP. A crashed cascade leaves the debt on a
+    // hidden intermediate generation, and the only request a
+    // client will ever retry is the original delete of the leaf.
+    // Repairing only this descriptor left the ancestor pinned
+    // and reported success.
+    // Each hop resolves in the project of the descriptor that
+    // HOLDS the reference (chain-invariant today, structurally
+    // per-hop).
+    let mut next = d.forked_from.as_ref().map(|f| d.ref_in_project(&f.source));
+    for _ in 0..64 {
+        let Some(anc_ref) = next else { break };
+        let Some(anc) = state
+            .registry
+            .get(&anc_ref)
+            .await
+            .map_err(|e| e.to_string())?
+        else {
+            break;
+        };
+        if !(anc.deleted && anc.parent_ref_pending) {
+            break;
+        }
+        let conclusive = match anc.forked_from.as_ref() {
+            Some(gp) => {
+                release_fork_ref(
+                    state,
+                    anc.ref_in_project(&gp.source),
+                    &gp.fork_id,
+                    &gp.source_epoch,
+                )
+                .await?
+            }
+            None => true,
+        };
+        if conclusive {
+            let debt = anc
+                .forked_from
+                .as_ref()
+                .map(|gp| (gp.source.clone(), gp.fork_id.clone()));
+            clear_parent_debt(
+                state,
+                &anc_ref,
+                &anc.stream_epoch,
+                debt.as_ref().map(|(a, b)| (a.as_str(), b.as_str())),
+            )
+            .await?;
+        }
+        next = anc
+            .forked_from
+            .as_ref()
+            .map(|g| anc.ref_in_project(&g.source));
+    }
+    Ok(())
+}
+
+/// Advance every segment's storage clock to the persisted close stamp and
+/// zero its gauge. Submission is awaited: a full committer queue is
+/// backpressure, never a silent drop, and a submission that still fails is
+/// safe because the debt lives on the tombstone and the sweep retries it.
+#[expect(
+    clippy::expect_used,
+    reason = "submit_billing_closes; every segment id is read from the descriptor's own validated topology, whose routes are total over its segments; a fallible lookup would add a branch no listed segment reaches"
+)]
+async fn submit_billing_closes(state: &Arc<CreationService>, d: &StreamDesc, close_stamp: i64) {
+    let seg_ids: Vec<u32> = d
+        .segments
+        .as_ref()
+        .map(|m| m.segments.iter().map(|sg| sg.seg_id).collect())
+        .unwrap_or_else(|| vec![0]);
+    for sid in seg_ids {
+        let identity = d.dynamic_segment_identity(sid);
+        let route = d
+            .segment_route_by_id(sid)
+            .expect("segment selected from validated topology");
+        if let Ok(engine) = state.resolve(&route).await
+            && let Err(e) = engine.submit_billing_close(identity, close_stamp).await
+        {
+            tracing::warn!(
+                "delete {}: billing close submit failed \
+                     (tombstone debt persists; sweep retries): {e}",
+                d.name
+            );
+        }
+    }
+}
+
 fn delete_transition(current: &StreamDesc, close_ms: i64) -> Mutation<DeleteTransition> {
     if current.deleted {
         return Mutation::Decline(DeleteTransition::AlreadyDeleted);
diff --git a/src/application/creation/fork.rs b/src/application/creation/fork.rs
index 5be80f59..87a09240 100644
--- a/src/application/creation/fork.rs
+++ b/src/application/creation/fork.rs
@@ -21,6 +21,10 @@ pub(super) struct PreparedFork {
     pub content_type: String,
     pub ttl_secs: Option<u64>,
 }
+#[expect(
+    clippy::too_many_lines,
+    reason = "prepare; fork preparation validates the source, its lifecycle, the boundary and the child's policy in the order a fork request must fail; splitting it would separate the checks from the order that decides which error a client sees"
+)]
 pub(super) async fn prepare(
     state: &Arc<CreationService>,
     input: Preparation<'_>,
@@ -176,6 +180,22 @@ struct Boundary {
     sub: u64,
     materialize: Option<Bytes>,
 }
+#[expect(
+    clippy::too_many_lines,
+    reason = "validate_boundary; the boundary walk reads the source record at the fork offset and certifies the materialized partial in one pass; splitting it would separate the partial from the record it is cut from"
+)]
+#[expect(
+    clippy::unwrap_used,
+    reason = "validate_boundary; a poisoned stream state may hold a half-advanced durable frontier; recovering it could validate a boundary against a length never made durable"
+)]
+#[expect(
+    clippy::cast_possible_truncation,
+    reason = "validate_boundary; the sub-offset was checked against the record's length, itself a usize; a checked conversion would only restate that bound"
+)]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "validate_boundary; the walk nests the ceiling verdict inside the partial-record branch of the boundary check; flattening it would separate the verdict from the partial it certifies"
+)]
 async fn validate_boundary(
     state: &Arc<CreationService>,
     src: &StreamDesc,
diff --git a/src/application/creation/initialization.rs b/src/application/creation/initialization.rs
index 991f2c5c..4474dbba 100644
--- a/src/application/creation/initialization.rs
+++ b/src/application/creation/initialization.rs
@@ -3,6 +3,18 @@ use super::deletion::release_fork_ref;
 use super::raw::CreatePlan;
 use super::*;
 
+#[expect(
+    clippy::too_many_arguments,
+    reason = "seed; seeding takes the plan, descriptor, key and fork parts separately as creation resolved them; a seed struct would exist only for this signature"
+)]
+#[expect(
+    clippy::too_many_lines,
+    reason = "seed; the tail seed, the fork reference and the readiness publish are one initialization whose compensation depends on which step failed; splitting them would separate the steps from the compensation they order"
+)]
+#[expect(
+    clippy::unwrap_used,
+    reason = "seed; a poisoned stream state may hold a half-advanced durable frontier; recovering it could seed a child from a length never made durable"
+)]
 pub(super) async fn seed(
     state: &Arc<CreationService>,
     plan: &CreatePlan,
@@ -162,6 +174,10 @@ pub(super) async fn seed(
     Ok((next, closed_now))
 }
 
+#[expect(
+    clippy::excessive_nesting,
+    reason = "publish; the readiness verdict nests the fork-claim compensation inside the declined-CAS branch; flattening it would separate the compensation from the verdict that requires it"
+)]
 pub(super) async fn publish(
     state: &Arc<CreationService>,
     plan: &CreatePlan,
diff --git a/src/application/creation/product.rs b/src/application/creation/product.rs
index 66c98d04..598a39e5 100644
--- a/src/application/creation/product.rs
+++ b/src/application/creation/product.rs
@@ -17,6 +17,10 @@ impl From<CreationError> for ProductCreateError {
     }
 }
 impl CreationService {
+    #[expect(
+        clippy::too_many_lines,
+        reason = "create_product; the winner, retained-name and fresh-create branches are one decision over the product's name; splitting them would separate the decision from the write it guards"
+    )]
     pub(crate) async fn create_product(
         self: &Arc<Self>,
         sref: crate::tenant::TenantStreamRef,
@@ -115,15 +119,14 @@ impl CreationService {
                     })?;
                 if created {
                     (true, winner)
+                } else if winner.soft_deleted || !winner.fork_children.is_empty() {
+                    return Err(CreationError::new(
+                        CreationFailure::Conflict,
+                        "gone",
+                        "name is retained for live forks",
+                    )
+                    .into());
                 } else {
-                    if winner.soft_deleted || !winner.fork_children.is_empty() {
-                        return Err(CreationError::new(
-                            CreationFailure::Conflict,
-                            "gone",
-                            "name is retained for live forks",
-                        )
-                        .into());
-                    }
                     (false, validate_live(winner)?)
                 }
             }
diff --git a/src/application/lifecycle.rs b/src/application/lifecycle.rs
index bfe1428d..d4ff4052 100644
--- a/src/application/lifecycle.rs
+++ b/src/application/lifecycle.rs
@@ -429,9 +429,8 @@ pub(crate) async fn begin_sealing_for_close(
         EnterSeal::Installed { generation } | EnterSeal::AlreadyOurs { generation } => {
             Ok(Some(generation))
         }
-        EnterSeal::AlreadyCompleted => Ok(None),
-        EnterSeal::AlreadySealed => Ok(None), // already terminal; the close is a no-op
-        EnterSeal::Missing => Ok(None),
+        // Already terminal or absent: the close is a no-op.
+        EnterSeal::AlreadyCompleted | EnterSeal::AlreadySealed | EnterSeal::Missing => Ok(None),
         EnterSeal::Conflicting(m) => Err(SealError::Conflict(m)),
         EnterSeal::PendingTopology => Err(SealError::Resumable(
             "a split or merge is in flight; retry the close".into(),
@@ -681,10 +680,9 @@ async fn prepare_execution(
             EnterSeal::Installed { generation } | EnterSeal::AlreadyOurs { generation } => {
                 our_gen = Some(generation);
             }
-            EnterSeal::AlreadyCompleted => return Ok(None),
+            EnterSeal::AlreadyCompleted | EnterSeal::Missing => return Ok(None),
             EnterSeal::AlreadySealed if op_id.is_empty() => return Ok(None),
             EnterSeal::AlreadySealed => return Err(SealError::OtherOperation),
-            EnterSeal::Missing => return Ok(None),
             EnterSeal::Conflicting(m) => return Err(SealError::Conflict(m)),
             EnterSeal::PendingTopology => {
                 return Err(SealError::Resumable(
diff --git a/src/application/lifecycle/claims.rs b/src/application/lifecycle/claims.rs
index a411fbb5..03b27063 100644
--- a/src/application/lifecycle/claims.rs
+++ b/src/application/lifecycle/claims.rs
@@ -61,6 +61,10 @@ pub(crate) enum SealClaim {
 }
 
 /// An attempt-local decision. No captured output can leak from a CAS that lost.
+#[expect(
+    clippy::expect_used,
+    reason = "decide_claim; the persisted copy carries the claim the match just observed; a fallible write would add a branch no observed claim reaches"
+)]
 pub(super) fn decide_claim(
     current: &StreamDesc,
     op_id: &str,
@@ -218,7 +222,6 @@ pub(crate) enum FinalDisposition {
 pub(crate) fn final_err_disposition(e: &crate::shard::AppendErr) -> FinalDisposition {
     use crate::shard::AppendErr::*;
     match e {
-        ProducerGap { .. } | ProducerEpochSeq => FinalDisposition::AmbiguousOrTransient,
         ProducerStale { .. }
         | ProducerSeqReused
         | CtMismatch
@@ -226,6 +229,8 @@ pub(crate) fn final_err_disposition(e: &crate::shard::AppendErr) -> FinalDisposi
         | SeqConflict { .. }
         | Closed { .. }
         | SealSuperseded => FinalDisposition::DefinitivelyRejected,
+        // A producer gap or epoch/sequence disagreement may still resolve
+        // once the producer catches up, like every other error.
         _ => FinalDisposition::AmbiguousOrTransient,
     }
 }
diff --git a/src/application/read.rs b/src/application/read.rs
index 37c55902..14ddede7 100644
--- a/src/application/read.rs
+++ b/src/application/read.rs
@@ -29,7 +29,10 @@ pub(crate) struct ReadPlan<'a> {
 }
 
 impl<'a> ReadPlan<'a> {
-    #[allow(clippy::too_many_arguments)]
+    #[expect(
+        clippy::too_many_arguments,
+        reason = "ReadPlan::segment; the constructor takes every field of the plan it builds, as the caller resolved them; a builder would restate the plan's own fields"
+    )]
     pub(crate) fn segment(
         key: &'a StreamKey,
         epoch: &'a [u8; 16],
@@ -57,7 +60,10 @@ impl<'a> ReadPlan<'a> {
 }
 
 /// Compatibility call shape for in-crate engine probes; there is one executor.
-#[allow(clippy::too_many_arguments)]
+#[expect(
+    clippy::too_many_arguments,
+    reason = "read_merged; the compatibility call shape lists the segment plan's fields positionally for the in-crate engine probes; a plan struct is what it builds"
+)]
 pub(crate) async fn read_merged(
     key: &StreamKey,
     epoch: &[u8; 16],
@@ -112,13 +118,27 @@ pub(crate) struct ReadPage {
 /// (`src/dst.rs`). A second copy of this boundary logic would be a copy
 /// that can drift, and drift here means the oracle stops testing what
 /// production does.
-#[allow(clippy::too_many_arguments)]
 /// Round-13 CODE-RED bisect: the repro's stream carries ONLY rk=""
 /// records, so keyed reads must be dense too — armed by the test.
 #[cfg(test)]
 pub(crate) static TEST_ASSERT_KEYED_DENSE: std::sync::atomic::AtomicBool =
     std::sync::atomic::AtomicBool::new(false);
 
+#[expect(
+    clippy::too_many_lines,
+    reason = "execute_segment; the ring, history and tail legs of one segment read share the boundary the plan fixed; splitting them would separate the legs from the boundary that orders them"
+)]
+#[expect(
+    clippy::unwrap_used,
+    reason = "execute_segment; a poisoned stream state may hold a half-advanced durable frontier; recovering it could serve a page past a length never made durable"
+)]
+#[cfg_attr(
+    test,
+    expect(
+        clippy::excessive_nesting,
+        reason = "execute_segment; the keyed-dense audit nests the offset walk inside the test-armed check of the history leg; flattening it would separate the audit from the leg it inspects"
+    )
+)]
 async fn execute_segment(plan: ReadPlan<'_>) -> Result<ReadPage, String> {
     let ReadPlan {
         key,
@@ -327,6 +347,10 @@ pub(crate) struct ReadService {
 }
 
 impl ReadService {
+    #[expect(
+        clippy::too_many_arguments,
+        reason = "ReadService::new; the service is assembled from its registry, shard directory, peer, ownership and topology collaborators as bootstrap wires them; a builder would restate the service's own fields"
+    )]
     pub(crate) fn new(
         registry: Arc<Registry>,
         shards: ShardDirectory,
@@ -406,22 +430,20 @@ fn fork_chain_of(state: &ReadService, desc: &StreamDesc) -> ForkChainFuture {
                 )
             });
             chain.push((cur, boundary, epoch));
-            match parent {
-                None => break,
-                Some((src, src_ref, want_epoch)) => {
-                    let d = match state_reg.get(&src_ref).await {
-                        Ok(Some(d)) if !d.deleted => d,
-                        _ => return Err(format!("fork source '{src}' is gone")),
-                    };
-                    if !want_epoch.is_empty() && d.stream_epoch != want_epoch {
-                        return Err(format!(
-                            "fork source '{src}' is a different incarnation                              (expected {want_epoch}, found {})",
-                            d.stream_epoch
-                        ));
-                    }
-                    cur = d;
-                }
+            let Some((src, src_ref, want_epoch)) = parent else {
+                break;
+            };
+            let d = match state_reg.get(&src_ref).await {
+                Ok(Some(d)) if !d.deleted => d,
+                _ => return Err(format!("fork source '{src}' is gone")),
+            };
+            if !want_epoch.is_empty() && d.stream_epoch != want_epoch {
+                return Err(format!(
+                    "fork source '{src}' is a different incarnation                              (expected {want_epoch}, found {})",
+                    d.stream_epoch
+                ));
             }
+            cur = d;
         }
         Ok(chain)
     })
@@ -435,7 +457,10 @@ fn fork_chain_of(state: &ReadService, desc: &StreamDesc) -> ForkChainFuture {
 /// matching record: match-free scanned ranges and drained ancestors
 /// count as progress (follow-up review finding 6), so filtered
 /// callers never rescan a range the chain already proved empty.
-#[allow(clippy::too_many_arguments)]
+#[expect(
+    clippy::unwrap_used,
+    reason = "read_stitched; a poisoned stream state may hold a half-advanced durable frontier; recovering it could stitch a page past a length never made durable"
+)]
 pub(crate) async fn read_stitched(
     state: &ReadService,
     desc: &StreamDesc,
@@ -775,6 +800,10 @@ async fn decode_history_range(
 /// A tail page is accepted only after ruling out a concurrent durable trim.
 /// A retained dense durable-ring interval already proves what was inspected.
 /// Other filtered scans still need the remotely durable boundary/layout tuple.
+#[expect(
+    clippy::too_many_arguments,
+    reason = "absorption_race; the race check takes the engine, hash, page, cursor, end and filter flag the read loop already holds; a context struct would exist only for this signature"
+)]
 async fn absorption_race(
     engine: &Arc<ShardEngine>,
     hash: [u8; 16],
@@ -833,6 +862,10 @@ async fn absorption_race(
 #[cfg(test)]
 mod o2_tests {
     use super::*;
+    #[expect(
+        clippy::cast_possible_truncation,
+        reason = "o2_batch_publishes_one_owner_only_after_authentication_and_admission; the fixture's offsets are counters below 256 that seed and check each payload byte; checked conversions would only restate the fixture's size"
+    )]
     #[test]
     fn o2_batch_publishes_one_owner_only_after_authentication_and_admission() {
         let key = crate::crypto::StreamKey([7; 32]);
diff --git a/src/application/topology.rs b/src/application/topology.rs
index eb5ce0b5..0aa06d83 100644
--- a/src/application/topology.rs
+++ b/src/application/topology.rs
@@ -410,6 +410,14 @@ pub(crate) async fn resume_fenced(
     resume_incarnation(st, sref, Some(epoch)).await
 }
 
+#[expect(
+    clippy::expect_used,
+    reason = "resume_incarnation; the segment map was checked present before the split resumes; a second fallible read would add a branch no checked topology reaches"
+)]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "resume_incarnation; the route salt loop nests the prefix comparison inside the resumed split's mutation closure; flattening it would separate the candidate route from the topology it must differ from"
+)]
 async fn resume_incarnation(
     st: &TopologyService,
     sref: &crate::tenant::TenantStreamRef,
@@ -552,6 +560,10 @@ async fn resume_incarnation(
 /// merged child on the low parent's route. Crash-resumable from the
 /// persisted pending intent; the seal-gap read semantics apply to both
 /// parents automatically (pending.segs names them).
+#[expect(
+    clippy::expect_used,
+    reason = "resume_merge; the segment map was checked present before the merge resumes; a second fallible read would add a branch no checked topology reaches"
+)]
 async fn resume_merge(
     st: &TopologyService,
     desc: &StreamDesc,
diff --git a/src/audit.rs b/src/audit.rs
index a802b6b3..0cb1bad9 100644
--- a/src/audit.rs
+++ b/src/audit.rs
@@ -116,6 +116,10 @@ impl AuditJournal {
 /// Observe a product-surface response on its way out. Enforce-mode
 /// denials (a `DenialTag` extension) journal; everything else is a
 /// no-op. Never blocks and never alters the response.
+#[expect(
+    clippy::unwrap_used,
+    reason = "observe_denial; a poisoned audit queue may hold a half-pushed or half-drained event; recovering it could publish or drop an event twice"
+)]
 pub(crate) fn observe_denial(
     state: &crate::http::AppState,
     route: &str,
@@ -171,6 +175,14 @@ struct PendingAudit<'a> {
     body: Vec<u8>,
 }
 impl<'a> PendingAudit<'a> {
+    #[expect(
+        clippy::unwrap_used,
+        reason = "PendingAudit::take; a poisoned audit queue may hold a half-pushed or half-drained event; recovering it could publish or drop an event twice"
+    )]
+    #[expect(
+        clippy::expect_used,
+        reason = "PendingAudit::take; an oversized selection is only produced from a first queued event that overflowed the budget, so the queue holds it; a fallible pop would add a branch no oversized selection reaches"
+    )]
     fn take(
         queue: &'a Mutex<VecDeque<AuditEvent>>,
         dropped: &'a AtomicU64,
@@ -210,6 +222,10 @@ impl<'a> PendingAudit<'a> {
     }
 }
 impl Drop for PendingAudit<'_> {
+    #[expect(
+        clippy::unwrap_used,
+        reason = "PendingAudit::drop; a poisoned audit queue may hold a half-pushed or half-drained event; recovering it could publish or drop an event twice"
+    )]
     fn drop(&mut self) {
         if self.events.is_empty() {
             return;
diff --git a/src/auth_feed.rs b/src/auth_feed.rs
index bab396c2..17ad6272 100644
--- a/src/auth_feed.rs
+++ b/src/auth_feed.rs
@@ -344,7 +344,15 @@ pub(crate) async fn refresh_once(
 /// are meaningful from the first request), then a fixed cadence. The
 /// cadence must be well inside `POLICY_STALENESS_MAX_SECS` or the cell
 /// oscillates into staleness refusals; boot enforces that.
-pub fn spawn_refresher(
+#[expect(
+    clippy::too_many_arguments,
+    reason = "spawn_refresher; the refresher takes the auth service, its three sources, the cadence and the supervisor as boot wires them; a bundle struct would exist only for this signature"
+)]
+#[expect(
+    clippy::let_underscore_must_use,
+    reason = "spawn_refresher; the supervisor rejects a spawn only while it is stopping, when no refresh is owed; a rejected refresher has nothing left to fetch"
+)]
+pub(crate) fn spawn_refresher(
     auth: Arc<AuthService>,
     keys: Box<dyn KeySource>,
     policies: Box<dyn PolicySource>,
@@ -444,6 +452,10 @@ mod tests {
         assert_eq!(report.finished(), vec!["auth-refresher"]);
     }
 
+    #[expect(
+        clippy::let_underscore_must_use,
+        reason = "refresh_once_publishes_from_files_and_survives_a_broken_one; the fixture removes its temporary directory on the way out; a failed removal leaves nothing the assertions depend on"
+    )]
     #[tokio::test]
     async fn refresh_once_publishes_from_files_and_survives_a_broken_one() {
         let dir = std::env::temp_dir().join(format!("mt-feed-{}", std::process::id()));
diff --git a/src/bin/livebench.rs b/src/bin/livebench.rs
index 7040f80f..05f96aec 100644
--- a/src/bin/livebench.rs
+++ b/src/bin/livebench.rs
@@ -164,6 +164,10 @@ fn legacy_wait_url_sig(sig_key: &[u8; 32], watch_key_hex: &str) -> String {
     clippy::cast_possible_truncation,
     reason = "main; tenant selection hashes a 64-bit transaction id on a 64-bit target; a checked conversion would only restate the pointer width the bench assumes"
 )]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "main; the bench nests each consumer's poll loop and each generator's publish loop inside the task it spawns for them; flattening them would separate the loops from the tasks whose lifetimes bound them"
+)]
 async fn main() -> anyhow::Result<()> {
     let args = Args::parse();
     let http = client();
diff --git a/src/bin/verify.rs b/src/bin/verify.rs
index 003adcb4..c02413c7 100644
--- a/src/bin/verify.rs
+++ b/src/bin/verify.rs
@@ -156,8 +156,8 @@ async fn latency(args: &Args) -> anyhow::Result<()> {
         let _ = s.get(&key).await?.bytes().await?;
         get_ms.push(t.elapsed().as_secs_f64() * 1000.0);
     }
-    put_ms.sort_by(|a, b| a.partial_cmp(b).unwrap());
-    get_ms.sort_by(|a, b| a.partial_cmp(b).unwrap());
+    put_ms.sort_by(f64::total_cmp);
+    get_ms.sort_by(f64::total_cmp);
     println!(
         "10KiB PUT ms: min={:.0} p50={:.0} max={:.0}",
         put_ms[0],
diff --git a/src/deployment.rs b/src/deployment.rs
index 6435737f..ee3ffc0d 100644
--- a/src/deployment.rs
+++ b/src/deployment.rs
@@ -50,6 +50,10 @@ impl DeploymentIdentity {
     /// already be canonical (`canonical_name` ran at the route boundary);
     /// the checked construction keeps unvalidated bytes out of registry
     /// paths and identity hashes.
+    #[expect(
+        clippy::expect_used,
+        reason = "DeploymentIdentity::raw_adapter_sref; the raw adapters pass names they already validated as canonical; a fallible lookup would add a branch no adapter reaches"
+    )]
     // mt-lint: allow(name-param-shared-core): the raw adapters' ONE identity source — a canonical name becomes deployment-tenant identity here and nowhere else (SR-6)
     pub(crate) fn raw_adapter_sref(&self, canonical_name: &str) -> TenantStreamRef {
         TenantStreamRef::new(
diff --git a/src/dst/fault_store.rs b/src/dst/fault_store.rs
index 50c79400..14ff2128 100644
--- a/src/dst/fault_store.rs
+++ b/src/dst/fault_store.rs
@@ -122,7 +122,7 @@ fn mix(seed: u64, path: &str, op: u8, n: u64) -> u64 {
     let mut h: u64 = 0xcbf2_9ce4_8422_2325;
     for b in path.as_bytes() {
         h ^= *b as u64;
-        h = h.wrapping_mul(0x1000_0000_1b3);
+        h = h.wrapping_mul(0x100_0000_01b3);
     }
     let mut z = seed ^ h ^ ((op as u64) << 56) ^ n.wrapping_mul(0x9e37_79b9_7f4a_7c15);
     z = (z ^ (z >> 30)).wrapping_mul(0xbf58_476d_1ce4_e5b9);
@@ -211,6 +211,10 @@ impl FaultState {
 
     /// Latency / hold / error decision, shared by every verb.
     /// `Ok(true)` means "perform it, then discard the response".
+    #[expect(
+        clippy::let_underscore_must_use,
+        reason = "FaultState::gate; the permit is the wait itself and is released the moment it is granted, so the gate paces operations without holding them; a bound permit would serialise the store"
+    )]
     async fn gate(&self, op: StoreOp, path: &str) -> OsResult<bool> {
         self.ops.fetch_add(1, Ordering::Relaxed);
         let class = ObjClass::of(path);
@@ -430,6 +434,10 @@ impl ObjectStore for FaultStore {
     /// recovery walked an untouched store. Faults apply at two points a
     /// real listing can fail: before the first item, and mid-stream after
     /// partial results (truncation with a terminal error).
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "FaultStore::list; the listing unfold nests the gate verdict inside the first-poll branch of the scripted stream; flattening it would separate the verdict from the poll it fails"
+    )]
     fn list(
         &self,
         prefix: Option<&ObjPath>,
@@ -515,6 +523,10 @@ impl ObjectStore for FaultStore {
     /// zombie DB in ladder pass 3. Leaving the most dangerous verb
     /// unfaulted was a real gap. A faulted delete leaves the object in
     /// place, which is how garbage accumulates when GC cannot keep up.
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "FaultStore::delete_stream; the delete unfold nests the one-item inner stream and the lost-response verdict inside each location's step; flattening them would separate the verdict from the delete it may lose"
+    )]
     fn delete_stream(
         &self,
         locations: futures_util::stream::BoxStream<'static, OsResult<ObjPath>>,
diff --git a/src/dst/review_readiness.rs b/src/dst/review_readiness.rs
index 2816e151..4ff8bc16 100644
--- a/src/dst/review_readiness.rs
+++ b/src/dst/review_readiness.rs
@@ -7,6 +7,10 @@ use super::fixture_storage::mem;
 use crate::tasks::{Policy, TaskResult};
 use std::time::Duration;
 
+#[expect(
+    clippy::excessive_nesting,
+    reason = "readiness_endpoint_refuses_each_permanent_critical_exit; the fixture nests the unready wait inside the timeout that bounds it inside the test; flattening it would separate the wait from the bound it must respect"
+)]
 #[tokio::test]
 async fn readiness_endpoint_refuses_each_permanent_critical_exit() {
     for outcome in 0..3 {
diff --git a/src/dst/review_security.rs b/src/dst/review_security.rs
index 8603681b..99c29f09 100644
--- a/src/dst/review_security.rs
+++ b/src/dst/review_security.rs
@@ -147,6 +147,10 @@ async fn r15_bodyless_and_unauthorized_requests_never_poll_the_body() {
     engine_shutdown(&rig.state).await;
 }
 
+#[expect(
+    clippy::excessive_nesting,
+    reason = "r16_unauthorized_watch_shapes_are_independent_of_existence; the fixture nests the deleted-versus-initializing stamp inside its descriptor mutation and the query sweep inside the cursor and key sweeps; flattening them would separate each shape from the descriptor and the shapes it is compared against"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn r16_unauthorized_watch_shapes_are_independent_of_existence() {
     use axum::http::{Method, StatusCode};
diff --git a/src/dst/runtime.rs b/src/dst/runtime.rs
index 12e6401b..3a32fba7 100644
--- a/src/dst/runtime.rs
+++ b/src/dst/runtime.rs
@@ -60,6 +60,10 @@ impl OpLog {
 
     /// Audit what a reader actually drained. `observed` is per routing key,
     /// in read order.
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "OpLog::audit; the audit nests each key's acknowledged-but-unreadable and out-of-order checks inside the per-key walk; flattening them would separate the verdicts from the key they judge"
+    )]
     pub(crate) fn audit(&self, observed: &HashMap<String, Vec<AttemptId>>) -> Result<(), String> {
         // The ledger must be self-consistent, or a harness bug could
         // silently weaken every check below.
@@ -330,11 +334,8 @@ impl Workload {
                 self.coverage.hit(mech::APPEND_REJECTED);
                 Outcome::Rejected
             }
-            Ok(Err(AppendErr::Moved | AppendErr::Closed { .. } | AppendErr::Internal(_))) => {
-                self.coverage.hit(mech::APPEND_UNKNOWN);
-                Outcome::Unknown
-            }
-            Err(_) => {
+            Ok(Err(AppendErr::Moved | AppendErr::Closed { .. } | AppendErr::Internal(_)))
+            | Err(_) => {
                 self.coverage.hit(mech::APPEND_UNKNOWN);
                 Outcome::Unknown
             }
@@ -376,6 +377,10 @@ impl Workload {
         clippy::too_many_arguments,
         reason = "Workload::append_to; the DST workload takes the engine, stream, key, payload and fault knobs separately as each scenario states them; a request struct would hide which knob a scenario varies"
     )]
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "Workload::append_to; the append log nests the duplicate mark inside the acknowledged arm of the outcome match inside the attempt loop; flattening it would separate the mark from the acknowledgement it qualifies"
+    )]
     pub(crate) async fn append_to(
         &mut self,
         engines: &[&Arc<crate::shard::ShardEngine>],
diff --git a/src/dst/tests/billing_maintenance.rs b/src/dst/tests/billing_maintenance.rs
index f5a16201..0d1c2b29 100644
--- a/src/dst/tests/billing_maintenance.rs
+++ b/src/dst/tests/billing_maintenance.rs
@@ -10,6 +10,10 @@ use std::sync::Arc;
 /// A stream whose TTL lapsed has a dead descriptor and a live gauge;
 /// the drain-time reconciler resubmits the closure until the gauge
 /// zeroes, and journals the lifecycle observation.
+#[expect(
+    clippy::let_underscore_must_use,
+    reason = "expiry_closes_the_storage_gauge; the fixture drains billing debt until the gauge closes, and each pass's own result is irrelevant to the closure it polls for; a handled result would only restate the poll"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn expiry_closes_the_storage_gauge() {
     let store = mem();
diff --git a/src/dst/tests/consumer_generations.rs b/src/dst/tests/consumer_generations.rs
index 774bee5e..95511fe7 100644
--- a/src/dst/tests/consumer_generations.rs
+++ b/src/dst/tests/consumer_generations.rs
@@ -511,6 +511,10 @@ async fn a_parked_saga_never_touches_a_recreated_stream() {
     clippy::too_many_lines,
     reason = "bounded cleanup scenario; seeding dead-generation residue at scale, draining it in bounded steps and checking the live generation form one causal sequence; helper phases would hide which step touched the live rows"
 )]
+#[expect(
+    clippy::cast_possible_truncation,
+    reason = "a_bounded_cleanup_drains_residue_without_touching_the_live_generation; the fixture's row counts and budgets are small whole numbers it chose; checked conversions would only restate the fixture"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn a_bounded_cleanup_drains_residue_without_touching_the_live_generation() {
     let store = mem();
diff --git a/src/dst/tests/consumer_product.rs b/src/dst/tests/consumer_product.rs
index cd69b37e..614fe659 100644
--- a/src/dst/tests/consumer_product.rs
+++ b/src/dst/tests/consumer_product.rs
@@ -411,6 +411,10 @@ async fn product_consumer_dlq_flow() {
     clippy::too_many_lines,
     reason = "lineage consumption scenario; consuming the sealed predecessor's backlog, splitting and continuing on the children form one causal sequence; helper phases would hide which lineage step delivered or settled out of order"
 )]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "product_consumer_drains_lineage_across_split; the fixture nests the drained verdict inside the empty-page branch of its pull loop; flattening it would separate the verdict from the page that proves it"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn product_consumer_drains_lineage_across_split() {
     let _l = gap_lock().lock().await;
diff --git a/src/dst/tests/fault_substrate.rs b/src/dst/tests/fault_substrate.rs
index a2337fd7..095a3330 100644
--- a/src/dst/tests/fault_substrate.rs
+++ b/src/dst/tests/fault_substrate.rs
@@ -51,6 +51,10 @@ async fn fault_placement_is_a_pure_function_of_the_seed() {
 }
 
 /// A fault store that never injects proves nothing.
+#[expect(
+    clippy::let_underscore_must_use,
+    reason = "faults_actually_fire; the fixture issues puts only to make the fault plan fire and counts the injections afterwards; each put's own outcome is the fault under test"
+)]
 #[tokio::test]
 async fn faults_actually_fire() {
     let s = FaultStore::uniform(mem(), 7, FaultPlan::new(20, 20, 30));
@@ -138,6 +142,10 @@ async fn deletes_and_reads_are_faulted_too() {
 /// only increment when a response was *actually* discarded. Counting the
 /// decision at roll time (the previous behaviour) let a scenario satisfy
 /// `require(STORE_LOST_RESPONSE)` on a verb that ignored the decision.
+#[expect(
+    clippy::let_underscore_must_use,
+    reason = "lost_response_counter_tracks_applied_behaviour_only; the fixture issues a multipart put only to prove the lost-response fault cannot apply to it; the put's outcome is not the claim"
+)]
 #[tokio::test]
 async fn lost_response_counter_tracks_applied_behaviour_only() {
     let inner = mem();
diff --git a/src/dst/tests/fixture_http.rs b/src/dst/tests/fixture_http.rs
index b247b3da..e5ee8943 100644
--- a/src/dst/tests/fixture_http.rs
+++ b/src/dst/tests/fixture_http.rs
@@ -241,6 +241,14 @@ pub(super) async fn http_rig_with_auth_service(
 /// directory lifecycle (a fenced or failed engine evicts itself and arms
 /// the anti-flap holdoff) instead of a rig-only shape with no close
 /// callback at all.
+#[expect(
+    clippy::too_many_arguments,
+    reason = "rig_opener; the rig opener takes the store, keys, shard config, park, absorber config and close notifier the rig assembles separately; a rig struct would restate the rig itself"
+)]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "rig_opener; the opener nests the close callback inside the engine construction it must outlive; flattening it would separate the callback from the incarnation it reports"
+)]
 pub(super) fn rig_opener(
     store: Arc<dyn ObjectStore>,
     keys: Arc<crate::history::KeyCache>,
@@ -350,6 +358,10 @@ fn fixture_config(
     clippy::too_many_lines,
     reason = "HTTP rig builder; every runtime owner is wired in one place so the fixture's dependency order stays visible to scenario authors; pass-through steps would hide which owner a scenario option changed"
 )]
+#[expect(
+    clippy::let_underscore_must_use,
+    reason = "http_rig_build; the supervisor rejects a spawn only while it is stopping, when the rig is being torn down; a rejected rig task has nothing left to serve"
+)]
 pub(super) async fn http_rig_build(
     store: Arc<dyn ObjectStore>,
     runtime: RigRuntime,
diff --git a/src/dst/tests/fixture_storage.rs b/src/dst/tests/fixture_storage.rs
index a3c2b446..d51d0eb1 100644
--- a/src/dst/tests/fixture_storage.rs
+++ b/src/dst/tests/fixture_storage.rs
@@ -147,6 +147,10 @@ pub(super) async fn open_engine_with_absorber_layout(
 
 /// Drain the merged reader WITH a key filter (drain_observed hardcodes
 /// unfiltered reads): paginate read_merged and collect attempt ids.
+#[expect(
+    clippy::cast_possible_truncation,
+    reason = "drain_filtered; the fixture's attempt numbers are small counters it wrote itself; a checked conversion would only restate the fixture"
+)]
 pub(super) async fn drain_filtered(
     engine: &Arc<crate::shard::ShardEngine>,
     hash: [u8; 16],
diff --git a/src/dst/tests/fleet_controller.rs b/src/dst/tests/fleet_controller.rs
index e928b4ae..0c60eada 100644
--- a/src/dst/tests/fleet_controller.rs
+++ b/src/dst/tests/fleet_controller.rs
@@ -23,6 +23,10 @@ impl std::fmt::Display for HeldDocument {
     }
 }
 impl HeldDocument {
+    #[expect(
+        clippy::let_underscore_must_use,
+        reason = "HeldDocument::enter; the permit is the park itself and is released the moment the test grants it; a held permit would keep the document entered after the test released it"
+    )]
     async fn enter(&self, path: &Path, write: bool) {
         if path.as_ref() == self.path && write == self.write {
             self.entered.fetch_add(1, Ordering::SeqCst);
@@ -89,6 +93,10 @@ impl ObjectStore for HeldDocument {
     clippy::too_many_lines,
     reason = "fleet cancellation scenario; entering documents, cancelling under partial authority and checking the retained retry form one causal sequence; helper phases would hide which document lost its retry"
 )]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "r09_fleet_cancels_entered_documents_without_partial_authority_or_lost_retry; the fixture nests the entered wait and the desired-state poll inside the timeouts that bound them; flattening them would separate the waits from the bounds they must respect"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn r09_fleet_cancels_entered_documents_without_partial_authority_or_lost_retry() {
     for (path, write) in [
diff --git a/src/dst/tests/fork_lifecycle.rs b/src/dst/tests/fork_lifecycle.rs
index 867777fb..1be50671 100644
--- a/src/dst/tests/fork_lifecycle.rs
+++ b/src/dst/tests/fork_lifecycle.rs
@@ -807,6 +807,10 @@ async fn fork_lifecycle_is_idempotent_and_epoch_checked() {
     clippy::disallowed_methods,
     reason = "unknown child fixture; the parked creation is released and joined before the source reference is checked; it must park concurrently in its unknown state"
 )]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "r05_unknown_child_state_preserves_its_source_reference; the fixture nests the park wait inside its timeout and the child's descriptor stamp inside its mutation; flattening them would separate the wait from its bound and the stamp from the descriptor it alters"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn r05_unknown_child_state_preserves_its_source_reference() {
     let _serial = gap_lock().lock().await;
diff --git a/src/dst/tests/lifecycle_creation.rs b/src/dst/tests/lifecycle_creation.rs
index a3349346..7404b96e 100644
--- a/src/dst/tests/lifecycle_creation.rs
+++ b/src/dst/tests/lifecycle_creation.rs
@@ -70,6 +70,10 @@ async fn a_stale_initialization_never_becomes_visible() {
 /// body under a different key completed the creation with a key the
 /// descriptor's own fingerprint does not match — a stream that cannot
 /// decrypt its first record.
+#[expect(
+    clippy::excessive_nesting,
+    reason = "an_initialization_cannot_be_resumed_with_another_key; the fixture nests the planted init claim inside the descriptor mutation inside the planting closure; flattening it would separate the claim from the descriptor it is planted on"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn an_initialization_cannot_be_resumed_with_another_key() {
     const OTHER_KEY: &str = "CQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQkJCQk=";
diff --git a/src/dst/tests/livefeed_history.rs b/src/dst/tests/livefeed_history.rs
index 2c8aaeae..fdfabbfc 100644
--- a/src/dst/tests/livefeed_history.rs
+++ b/src/dst/tests/livefeed_history.rs
@@ -78,6 +78,10 @@ async fn fork_materialized_partial_respects_the_record_ceiling() {
     clippy::too_many_lines,
     reason = "remote lineage scenario; two instances, the child's owner and the whole-lineage stream form one causal sequence; helper phases would hide which owner served the sealed predecessor"
 )]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "livefeed_remote_sealed_predecessor_streams_through_owner; the fixture nests the per-prefix owner choice inside the override loop of its two-instance layout; flattening it would separate the choice from the prefix it assigns"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn livefeed_remote_sealed_predecessor_streams_through_owner() {
     let store = mem();
@@ -204,9 +208,7 @@ async fn livefeed_remote_sealed_predecessor_streams_through_owner() {
         0,
         "the feed tears down at zero"
     );
-    state_b
-        .peer
-        .set_peer("inst-a", &"http://127.0.0.1:9".to_string());
+    state_b.peer.set_peer("inst-a", "http://127.0.0.1:9");
     let mut down = lf_connect(addr_b, "xown", "?cursor=beginning").await;
     let (held, eof3) = hub_sse_collect(&mut down, 2, |_| false).await;
     assert!(!eof3, "a peer outage is a stall, not a disconnect:\n{held}");
diff --git a/src/dst/tests/livefeed_swap.rs b/src/dst/tests/livefeed_swap.rs
index f9501555..db86dbb3 100644
--- a/src/dst/tests/livefeed_swap.rs
+++ b/src/dst/tests/livefeed_swap.rs
@@ -384,6 +384,10 @@ async fn livefeed_split_cursor_decodes_to_segment_local_and_resumes() {
 /// Round-4 blocker 2 (red): TWO shared subscribers, one swap — both
 /// receive the successor record exactly once, and both head cursors
 /// decode to the successor's segment-local position.
+#[expect(
+    clippy::excessive_nesting,
+    reason = "livefeed_split_shared_subscribers_swap_once_deliver_twice; the fixture nests the frame rendering inside the read of each split child inside the subscriber check; flattening it would separate the rendering from the child it renders"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn livefeed_split_shared_subscribers_swap_once_deliver_twice() {
     let store = mem();
diff --git a/src/dst/tests/persistence_faults.rs b/src/dst/tests/persistence_faults.rs
index ac0a69d9..799f8e2b 100644
--- a/src/dst/tests/persistence_faults.rs
+++ b/src/dst/tests/persistence_faults.rs
@@ -355,6 +355,10 @@ fn delivered_records(complete: &str) -> Vec<u64> {
     clippy::too_many_lines,
     reason = "cut-resume scenario; two resuming subscribers, a swinging absorb boundary, the serial appends and the exact per-subscriber reconciliation form one causal sequence; helper phases would hide which reconnect skipped a durable record"
 )]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "cut_resume_never_skips_a_durable_record; the fixture nests the gap diagnostics inside the per-subscriber failure report; flattening them would separate the context lines from the gap they explain"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 8)]
 async fn cut_resume_never_skips_a_durable_record() {
     let _l = gap_lock().lock().await; // shared failpoint schedule
diff --git a/src/dst/tests/quota_enforcement.rs b/src/dst/tests/quota_enforcement.rs
index a8dc7b6f..9ba49361 100644
--- a/src/dst/tests/quota_enforcement.rs
+++ b/src/dst/tests/quota_enforcement.rs
@@ -810,6 +810,10 @@ async fn catalog_failure_fails_the_stream_seed_closed() {
 /// Observed through the quota registry on the deployment tenant: the
 /// probe reservation at a cap of 1 succeeds only if BOTH the fork's
 /// own delete and the cascaded source tombstone released.
+#[expect(
+    clippy::let_underscore_must_use,
+    reason = "fork_cascade_hard_delete_releases_the_stream_slot; the fixture admits once only to seed the project's tracked slot; the guard it returns is dropped on purpose so the seed occupies nothing"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn fork_cascade_hard_delete_releases_the_stream_slot() {
     let (state, addr) = http_rig(mem()).await;
diff --git a/src/dst/tests/reads_history.rs b/src/dst/tests/reads_history.rs
index 2af77d48..f66c35b4 100644
--- a/src/dst/tests/reads_history.rs
+++ b/src/dst/tests/reads_history.rs
@@ -49,6 +49,10 @@ async fn the_first_advance_seals_the_history_layout() {
         __maint,
     );
 
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "wait_absorbed; the fixture nests the absorbed-frontier read and its verdict inside the poll loop; flattening them would separate the verdict from the frontier it reads"
+    )]
     async fn wait_absorbed(
         engine: &Arc<crate::shard::ShardEngine>,
         hash: [u8; 16],
diff --git a/src/dst/tests/reads_ring.rs b/src/dst/tests/reads_ring.rs
index 29828a3a..e51b25d1 100644
--- a/src/dst/tests/reads_ring.rs
+++ b/src/dst/tests/reads_ring.rs
@@ -34,6 +34,10 @@ fn window(from: u64, to: u64, max_bytes: usize) -> crate::shard::RingScan {
     clippy::disallowed_methods,
     reason = "ring ordering fixture; the appender is joined before the delivered offsets are compared; it must append concurrently with the parked waiter"
 )]
+#[expect(
+    clippy::cast_possible_truncation,
+    reason = "ring_ordering_paging_and_duplicates_at_offset_level; the fixture's frame counts are small offsets it published itself; a checked conversion would only restate the fixture"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn ring_ordering_paging_and_duplicates_at_offset_level() {
     let inner = mem();
@@ -288,6 +292,10 @@ async fn tail_ring_matches_the_db_scan_and_restarts_cold() {
 /// `read_merged`, is the 2026-07-27 boundary-race DST failure: records
 /// vanished from a `completed = true` page at exactly the sampled
 /// absorbed boundary.
+#[expect(
+    clippy::excessive_nesting,
+    reason = "a_duplicate_absorbed_op_does_not_advance_the_trim; the fixture nests the absorbed poll inside the wait closure it builds per engine; flattening it would separate the poll from the engine it watches"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn a_duplicate_absorbed_op_does_not_advance_the_trim() {
     let inner = mem();
diff --git a/src/dst/tests/request_topology_debt.rs b/src/dst/tests/request_topology_debt.rs
index 40fec0a1..fb3eecd3 100644
--- a/src/dst/tests/request_topology_debt.rs
+++ b/src/dst/tests/request_topology_debt.rs
@@ -10,6 +10,10 @@ use std::{sync::atomic::Ordering, time::Duration};
     clippy::too_many_lines,
     reason = "topology debt scenario; cancelling the job, measuring the exact debt and opening a fresh read owner form one causal sequence; helper phases would hide which owner inherited the debt"
 )]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "r09a_cancelled_topology_job_leaves_exact_debt_for_a_fresh_read_owner; the fixture nests the settled-topology verdict inside the descriptor poll loop; flattening it would separate the verdict from the descriptor it reads"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn r09a_cancelled_topology_job_leaves_exact_debt_for_a_fresh_read_owner() {
     let store = FaultStore::new(mem(), 911, FaultProfile::clean());
diff --git a/src/dst/tests/runtime_engine_lifecycle.rs b/src/dst/tests/runtime_engine_lifecycle.rs
index 85bd7543..bc1f4676 100644
--- a/src/dst/tests/runtime_engine_lifecycle.rs
+++ b/src/dst/tests/runtime_engine_lifecycle.rs
@@ -49,6 +49,10 @@ async fn ready_rig() -> super::fixture_http::HttpRig {
     rig
 }
 
+#[expect(
+    clippy::excessive_nesting,
+    reason = "r17a_each_required_engine_exit_changes_real_health_and_readyz; the fixture nests the exit wait inside the timeout that bounds it inside the test; flattening it would separate the wait from the bound it must respect"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn r17a_each_required_engine_exit_changes_real_health_and_readyz() {
     let independent = ready_rig().await;
diff --git a/src/dst/tests/runtime_open_gate.rs b/src/dst/tests/runtime_open_gate.rs
index b86f943e..f2d0affd 100644
--- a/src/dst/tests/runtime_open_gate.rs
+++ b/src/dst/tests/runtime_open_gate.rs
@@ -55,6 +55,10 @@ async fn seed_untrimmed_wal(store: Arc<dyn ObjectStore>, prefix: &str, records:
     clippy::disallowed_methods,
     reason = "reopen storm reproduction; the detached open is the defect being reproduced and its abandonment is counted through the fenced opens and the empty serving map; owning the open would remove the storm the scenario exists to reproduce"
 )]
+#[expect(
+    clippy::let_underscore_must_use,
+    reason = "naive_get_or_open; the fixture's opener hands the engine to whichever client still waits, and a send with no receiver means that client already timed out; that disconnect is the storm under test"
+)]
 async fn naive_get_or_open(
     lock: &tokio::sync::Mutex<()>,
     shards: &std::sync::RwLock<HashMap<String, Arc<crate::shard::ShardEngine>>>,
@@ -133,6 +137,10 @@ async fn naive_get_or_open(
 /// storm's signature from docs/SOAK-REGIONS.md, scaled down: WAL read
 /// amplification ≥ 3× the WAL itself, multiple writers opened and fenced,
 /// and — the wedge — the serving map STILL empty when the dust settles.
+#[expect(
+    clippy::let_underscore_must_use,
+    reason = "reopen_storm_reproduces_the_eu_central_wedge; the fixture drops each client's future at its timeout on purpose, exactly as the handler does; the outcome it discards is the disconnect under test"
+)]
 #[tokio::test(flavor = "current_thread", start_paused = true)]
 async fn reopen_storm_reproduces_the_eu_central_wedge() {
     let inner = mem();
@@ -334,12 +342,10 @@ async fn idle_engine_store_traffic_is_bounded_by_the_poll_cadence() {
             manifest_poll_interval: std::time::Duration::from_millis(
                 crate::DEFAULT_MANIFEST_POLL_MS,
             ),
-            compactor_options: {
-                let mut co = slatedb::config::CompactorOptions::default();
-                co.poll_interval =
-                    std::time::Duration::from_millis(crate::DEFAULT_COMPACTOR_POLL_MS);
-                Some(co)
-            },
+            compactor_options: Some(slatedb::config::CompactorOptions {
+                poll_interval: std::time::Duration::from_millis(crate::DEFAULT_COMPACTOR_POLL_MS),
+                ..Default::default()
+            }),
             ..Default::default()
         })
         .build()
@@ -514,6 +520,10 @@ async fn health_reports_unready_when_no_shard_has_ever_opened() {
 /// An engine that keeps dying young must meet an escalating holdoff, not
 /// an eager reopen: rapid open→die cycles against a sick store ARE the
 /// storm, whatever kills the engine.
+#[expect(
+    clippy::excessive_nesting,
+    reason = "open_gate_escalates_holdoff_for_engines_that_die_young; the fixture nests the retry sleep inside the wait arm of its open loop; flattening it would separate the sleep from the holdoff it honours"
+)]
 #[tokio::test(flavor = "current_thread", start_paused = true)]
 async fn open_gate_escalates_holdoff_for_engines_that_die_young() {
     use crate::sharddir::{OpenGate, OpenOutcome};
@@ -584,6 +594,10 @@ async fn open_gate_escalates_holdoff_for_engines_that_die_young() {
 /// eu-central-1 with an open looping in slatedb compactions recovery for
 /// 20+ minutes. One open, 648 coalesced waiters, zero storm — and an
 /// unavailable shard with no path back.
+#[expect(
+    clippy::let_underscore_must_use,
+    reason = "a_hung_open_is_deadlined_and_its_late_engine_reaped; the permit is the park itself and is released the moment the test grants it; a held permit would keep the opener parked after release"
+)]
 #[tokio::test(flavor = "current_thread", start_paused = true)]
 async fn a_hung_open_is_deadlined_and_its_late_engine_reaped() {
     use crate::sharddir::{OpenGate, OpenOutcome};
diff --git a/src/dst/tests/runtime_sweep.rs b/src/dst/tests/runtime_sweep.rs
index c470258b..b95d5581 100644
--- a/src/dst/tests/runtime_sweep.rs
+++ b/src/dst/tests/runtime_sweep.rs
@@ -8,6 +8,10 @@ use std::sync::Arc;
 
 /// Drain billing debt until the sweep's own probes read clean, so the
 /// retention decision under test is the MAINTENANCE one.
+#[expect(
+    clippy::let_underscore_must_use,
+    reason = "drain_billing_clean; the fixture drains billing debt until its own probes read clean; each pass's result is irrelevant to the cleanliness it polls for"
+)]
 async fn drain_billing_clean(state: &Arc<crate::http::AppState>, prefixes: &[&str]) {
     for _ in 0..200 {
         let _ = crate::billing::drain_once(state).await;
@@ -690,6 +694,10 @@ async fn tombstone_walk_peak_residency_stays_under_the_budget() {
     clippy::too_many_lines,
     reason = "walk fairness scenario; two shards' pinned debt, the occupied budget and the alternating walk form one causal sequence; helper phases would hide which shard the walk starved"
 )]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "tombstone_walk_fairness_under_occupied_budget; the fixture nests the pin request inside the first-seen check of the shard walk; flattening it would separate the pin from the shard it occupies"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn tombstone_walk_fairness_under_occupied_budget() {
     let _serial = sweep_lock().lock().await;
@@ -815,7 +823,10 @@ async fn tombstone_walk_fairness_under_occupied_budget() {
     );
 }
 
-#[allow(non_snake_case)]
+#[allow(
+    non_snake_case,
+    reason = "WALK_CLOSE_SUBMITS_SNAPSHOT; the snapshot is spelled as the constant it stands in for so the assertion reads as the invariant it pins; a snake-case name would hide that it is a fixed value"
+)]
 fn WALK_CLOSE_SUBMITS_SNAPSHOT() -> u64 {
     crate::billing::WALK_CLOSE_SUBMITS.load(std::sync::atomic::Ordering::Relaxed)
 }
diff --git a/src/dst/tests/security_freshness.rs b/src/dst/tests/security_freshness.rs
index f2b2b1b5..9cf819bb 100644
--- a/src/dst/tests/security_freshness.rs
+++ b/src/dst/tests/security_freshness.rs
@@ -56,6 +56,10 @@ impl LeaseRig {
     fn revoked(&mut self) -> bool {
         self.watch.revoked_with_clock(&self.state, &self.clock)
     }
+    #[expect(
+        clippy::fn_params_excessive_bools,
+        reason = "LeaseRig::publish; the fixture publishes the policy and the grants as two independent switches the scenarios toggle separately; an enum would restate two booleans"
+    )]
     fn publish(&mut self, policy: bool, grants: bool) {
         self.version += 1;
         if policy {
diff --git a/src/dst/tests/security_isolation.rs b/src/dst/tests/security_isolation.rs
index 5f7ad164..6d24ecb4 100644
--- a/src/dst/tests/security_isolation.rs
+++ b/src/dst/tests/security_isolation.rs
@@ -232,6 +232,10 @@ async fn one_cell_serves_two_projects_with_full_isolation() {
     clippy::disallowed_methods,
     reason = "noisy-neighbor fixture; the hostile and compliant campaigns are joined together before their outcomes are compared; they must run concurrently to contend on one cell"
 )]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "noisy_neighbor_cannot_degrade_a_compliant_project; the fixture nests each tenant's request loop inside the task that runs it concurrently with the other tenant; flattening them would separate the loops from the concurrency under test"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn noisy_neighbor_cannot_degrade_a_compliant_project() {
     const PRIV: &str = include_str!("../fixtures/mt-test-rsa.pem");
diff --git a/src/dst/tests/sse_delivery.rs b/src/dst/tests/sse_delivery.rs
index 67068c48..2b037701 100644
--- a/src/dst/tests/sse_delivery.rs
+++ b/src/dst/tests/sse_delivery.rs
@@ -37,6 +37,10 @@ async fn sse_send_disconnects_a_stalled_subscriber() {
     clippy::too_many_lines,
     reason = "lineage delivery scenario; subscribing from offset zero, splitting and receiving every pre-split and post-split record form one causal sequence; helper phases would hide which record the subscriber skipped"
 )]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "sse_follows_lineage_across_split; the fixture nests the line scan inside the chunk scan of each read; flattening it would separate the control frames from the chunk that carries them"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn sse_follows_lineage_across_split() {
     use tokio::io::{AsyncReadExt, AsyncWriteExt};
@@ -168,6 +172,10 @@ async fn sse_follows_lineage_across_split() {
     clippy::too_many_lines,
     reason = "signed control scenario; the product control frames, their signed key cursors and the resumed subscription form one causal sequence; helper phases would hide which frame carried a raw cursor"
 )]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "product_sse_controls_carry_signed_cursors; the fixture nests the line scan inside the chunk scan of each read; flattening it would separate the control frames from the chunk that carries them"
+)]
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
 async fn product_sse_controls_carry_signed_cursors() {
     use tokio::io::{AsyncReadExt, AsyncWriteExt};
diff --git a/src/dst/trace_store.rs b/src/dst/trace_store.rs
index 75cbc535..c615f0aa 100644
--- a/src/dst/trace_store.rs
+++ b/src/dst/trace_store.rs
@@ -182,7 +182,10 @@ struct TraceState {
 }
 
 impl TraceState {
-    #[allow(clippy::too_many_arguments)]
+    #[expect(
+        clippy::too_many_arguments,
+        reason = "TraceState::event; an event row takes the sequence, kind, operation, path, size, outcome, hash and detail as the tracer observed them; a row struct is what it builds"
+    )]
     fn event(
         &self,
         seq: u64,
@@ -217,6 +220,10 @@ impl TraceState {
     /// abandoned by async cancellation between dispatch and completion,
     /// leaving a permanent Pending event and a stuck active entry that
     /// made `reset()` refuse forever).
+    #[expect(
+        clippy::too_many_arguments,
+        reason = "TraceState::begin_operation; an operation opens with the kind, operation, path, size, hash and detail the store call carried; an operation struct is the event it records"
+    )]
     fn begin_operation(
         self: &Arc<Self>,
         op: StoreOp,
@@ -225,7 +232,7 @@ impl TraceState {
         content_hash: Option<String>,
         detail: Option<String>,
     ) -> TraceOperation {
-        let ev = |seq| {
+        let ev = move |seq| {
             self.event(
                 seq,
                 TraceEventKind::Operation,
@@ -233,8 +240,8 @@ impl TraceState {
                 path,
                 bytes,
                 TraceOutcome::Pending,
-                content_hash.clone(),
-                detail.clone(),
+                content_hash,
+                detail,
             )
         };
         let mut log = self.log.lock().unwrap();
@@ -270,6 +277,10 @@ impl TraceState {
 
     /// Push an already-resolved observation (delete-stream items are
     /// complete facts at the moment they pass through).
+    #[expect(
+        clippy::too_many_arguments,
+        reason = "TraceState::observe; an observation takes the kind, operation, path, detail and outcome as the tracer resolved them; an observation struct is the row it appends"
+    )]
     fn observe(
         &self,
         kind: TraceEventKind,
@@ -420,7 +431,11 @@ impl TraceStore {
     /// Explicit knobs. `content_hashes` opts into retaining a 16-hex-char
     /// sha256 prefix of each put payload; payload bytes themselves are
     /// never retained either way.
-    pub fn with_options(
+    #[expect(
+        clippy::fn_params_excessive_bools,
+        reason = "TraceStore::with_options; redaction and content hashing are two independent retention switches the harness sets separately; an options enum would restate two booleans"
+    )]
+    pub(crate) fn with_options(
         inner: Arc<dyn ObjectStore>,
         redact: bool,
         content_hashes: bool,
@@ -631,6 +646,10 @@ impl ObjectStore for TraceStore {
     /// (PR 3.2): while it is alive — consuming inputs, producing
     /// outputs — `reset()` refuses; exhaustion or drop retires the
     /// lifetime exactly once.
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "TraceStore::delete_stream; the traced unfold nests each result's observation inside the poll of the inner stream; flattening it would separate the observation from the result it records"
+    )]
     fn delete_stream(
         &self,
         locations: futures_util::stream::BoxStream<'static, OsResult<ObjPath>>,
diff --git a/src/dst/trace_store_tests/concurrency.rs b/src/dst/trace_store_tests/concurrency.rs
index 05511b75..33570b35 100644
--- a/src/dst/trace_store_tests/concurrency.rs
+++ b/src/dst/trace_store_tests/concurrency.rs
@@ -14,6 +14,10 @@ use std::sync::Arc;
 /// lock) this interleaving could push events out of id order,
 /// completions then found the wrong slot, both events stayed
 /// Pending, and `reset()` panicked forever.
+#[expect(
+    clippy::excessive_nesting,
+    reason = "concurrent_begins_with_reverse_finishes_resolve_every_event_exactly_once; the fixture nests each contender's begin inside the scoped thread it spawns inside the barrier scope; flattening it would separate the contention from the threads that stage it"
+)]
 #[test]
 fn concurrent_begins_with_reverse_finishes_resolve_every_event_exactly_once() {
     let s = TraceStore::verbatim(Arc::new(object_store::memory::InMemory::new()));
@@ -66,6 +70,10 @@ fn concurrent_begins_with_reverse_finishes_resolve_every_event_exactly_once() {
 /// observes the active lifetime and refuses. After joining, nothing
 /// is active and nothing is Pending — deterministically, in every
 /// round.
+#[expect(
+    clippy::let_underscore_must_use,
+    reason = "reset_racing_with_begin_cannot_orphan_an_operation; a refused reset is a legal outcome of the race the fixture stages; the assertions that follow check the invariants a refusal must still keep"
+)]
 #[test]
 fn reset_racing_with_begin_cannot_orphan_an_operation() {
     let s = TraceStore::verbatim(Arc::new(object_store::memory::InMemory::new()));
diff --git a/src/dst/trace_store_tests/mod.rs b/src/dst/trace_store_tests/mod.rs
index 63125256..5bb04e44 100644
--- a/src/dst/trace_store_tests/mod.rs
+++ b/src/dst/trace_store_tests/mod.rs
@@ -75,6 +75,10 @@ impl ObjectStore for DeleteSpy {
     async fn copy_opts(&self, from: &ObjPath, to: &ObjPath, opts: CopyOptions) -> OsResult<()> {
         self.inner.copy_opts(from, to, opts).await
     }
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "DeleteSpy::delete_stream; the scripted delete nests the consumed count inside the location match inside its unfold loop; flattening it would separate the count from the location it consumes"
+    )]
     fn delete_stream(
         &self,
         locations: futures_util::stream::BoxStream<'static, OsResult<ObjPath>>,
diff --git a/src/dst/trace_store_tests/streams.rs b/src/dst/trace_store_tests/streams.rs
index a98c6eaf..849fb48b 100644
--- a/src/dst/trace_store_tests/streams.rs
+++ b/src/dst/trace_store_tests/streams.rs
@@ -10,6 +10,10 @@ use object_store::{ObjectStore, PutOptions, PutPayload};
 /// alternative is silent misattribution of the late completion.
 #[tokio::test]
 #[should_panic(expected = "while operations are active")]
+#[expect(
+    clippy::disallowed_methods,
+    reason = "reset_refuses_while_in_flight; the fixture leaks the abandoned stream on purpose so its guard never runs and the operation stays in flight; dropping it would finish the very operation the refusal is about"
+)]
 async fn reset_refuses_while_in_flight() {
     use futures_util::StreamExt;
     let s = TraceStore::new(mem());
diff --git a/src/failpoints.rs b/src/failpoints.rs
index 494daf65..2fe13215 100644
--- a/src/failpoints.rs
+++ b/src/failpoints.rs
@@ -102,7 +102,11 @@ impl Fp {
     /// The site contract: WHERE the point fires, stated as the
     /// window it opens. This is the enumerable registry the DST
     /// program audits against.
-    pub fn site(self) -> &'static str {
+    #[expect(
+        clippy::too_many_lines,
+        reason = "Fp::site; the site registry states every failpoint's window in the one match the DST program audits; splitting it would separate the sites from the registry that enumerates them"
+    )]
+    pub(crate) fn site(self) -> &'static str {
         match self {
             Fp::StopAfterTombstone => {
                 "delete cascade: after the named generation is tombstoned \
@@ -233,9 +237,11 @@ fn active(fp: Fp) -> bool {
     ACTIVE[fp.idx()].load(std::sync::atomic::Ordering::Acquire) > 0
 }
 
-fn reg() -> &'static Mutex<HashMap<(Fp, String), FpState>> {
-    static M: std::sync::OnceLock<Mutex<HashMap<(Fp, String), FpState>>> =
-        std::sync::OnceLock::new();
+/// Every armed point, keyed by point and stream name.
+type Registry = Mutex<HashMap<(Fp, String), FpState>>;
+
+fn reg() -> &'static Registry {
+    static M: std::sync::OnceLock<Registry> = std::sync::OnceLock::new();
     M.get_or_init(|| Mutex::new(HashMap::new()))
 }
 
diff --git a/src/fleet.rs b/src/fleet.rs
index 0ba84a73..a5b6002a 100644
--- a/src/fleet.rs
+++ b/src/fleet.rs
@@ -192,7 +192,12 @@ pub(crate) fn valid_peer_url_with(url: &str, allow_http: bool, peer_domains: Opt
 /// ~REBALANCE_RETURN_SECS period (FLEET-CAMPAIGN.md, 4 shards over 4
 /// instances). A drained home (owns nothing) is always below the mean,
 /// so the ladder-p3 refill this block exists for still happens.
-pub fn return_home_allowed(owned: usize, gain: usize, total: usize, active_n: usize) -> bool {
+pub(crate) fn return_home_allowed(
+    owned: usize,
+    gain: usize,
+    total: usize,
+    active_n: usize,
+) -> bool {
     if active_n == 0 {
         return false;
     }
@@ -225,6 +230,13 @@ pub(crate) fn pick_victim_shard(shard_lags: &[(String, u64)], served: &[String])
 /// keeps those OS-reclaimable pages in resident_size (measured on the
 /// wedge repro: resident 120 MB vs phys_footprint 2 MB after drain).
 /// phys_footprint is the metric Darwin's own memory limits use.
+#[cfg_attr(
+    target_os = "macos",
+    expect(
+        clippy::cast_possible_truncation,
+        reason = "rss_bytes; the mach info word count is the size of a small fixed struct in 32-bit words; a checked conversion would only restate the ABI"
+    )
+)]
 pub(crate) fn rss_bytes() -> u64 {
     #[cfg(target_os = "linux")]
     {
@@ -410,7 +422,31 @@ pub(crate) fn start_configured(
 /// operator surface cannot be given different coordination stores —
 /// 6.1.1-C left that to caller discipline, and nothing in the types
 /// required the argument to equal `state.fleet`.
-pub fn start(state: Arc<AppState>, cfg: FleetCfg, tasks: &crate::tasks::TaskSupervisor) {
+#[expect(
+    clippy::too_many_lines,
+    reason = "start; the fleet tick reads the authority once and derives the heartbeat, the desired count, the rebalance and the publications from that one read; splitting it would separate the decisions from the read that dates them"
+)]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "start; the tick nests each decision inside the branch of the authority state that permits it; flattening them would separate the decisions from the state they were read under"
+)]
+#[expect(
+    clippy::unwrap_used,
+    reason = "start; a poisoned timing ring may hold a half-recorded wait, and the fleet documents serialise infallibly as plain data; recovering the former or handling the latter would add branches no tick reaches"
+)]
+#[expect(
+    clippy::cast_sign_loss,
+    reason = "start; the desired counts are ceilings of non-negative ratios bounded by the fleet maximum and the wedge seconds are clamped at zero; checked conversions would only restate those bounds"
+)]
+#[expect(
+    clippy::cast_possible_truncation,
+    reason = "start; the desired counts are ceilings of ratios bounded by the fleet maximum, far below u64; checked conversions would only restate that bound"
+)]
+#[expect(
+    clippy::let_underscore_must_use,
+    reason = "start; the supervisor rejects a spawn only while it is stopping, when no fleet tick is owed; a rejected loop has nothing left to decide"
+)]
+pub(crate) fn start(state: Arc<AppState>, cfg: FleetCfg, tasks: &crate::tasks::TaskSupervisor) {
     let _ = tasks.spawn("fleet", crate::tasks::Policy::Critical, move |cancel| async move {
         // The ONE authority: the same repository the drainer and the
         // operator view read through.
@@ -1105,148 +1141,4 @@ pub(crate) async fn drain_fleet_events(
 }
 
 #[cfg(test)]
-mod tests {
-    use super::*;
-    use std::collections::HashMap;
-
-    fn peers(v: &[(&str, f64, u64)]) -> HashMap<String, (f64, u64)> {
-        v.iter()
-            .map(|(n, c, l)| (n.to_string(), (*c, *l)))
-            .collect()
-    }
-
-    // Regression: ladder pass 3 did 7 moves in 10 minutes because moves
-    // were allowed to peers that were themselves behind.
-    #[test]
-    fn target_is_the_coolest_healthy_peer() {
-        let p = peers(&[("a", 90.0, 0), ("b", 10.0, 0), ("c", 50.0, 0)]);
-        assert_eq!(pick_move_target(&p, "a", 60).as_deref(), Some("b"));
-    }
-
-    #[test]
-    fn target_excludes_self() {
-        let p = peers(&[("a", 1.0, 0), ("b", 80.0, 0)]);
-        assert_eq!(pick_move_target(&p, "a", 60).as_deref(), Some("b"));
-    }
-
-    #[test]
-    fn no_target_when_every_peer_is_also_lagging() {
-        // fleet-wide backlog: hold shards rather than pass them around
-        let p = peers(&[("a", 5.0, 90), ("b", 5.0, 80), ("c", 5.0, 70)]);
-        assert_eq!(pick_move_target(&p, "a", 60), None);
-    }
-
-    // Regression: FLEET-CAMPAIGN.md — 4 shards over 4 instances drew
-    // 1/1/2/0; the rebalancer moved one off the 2-owner, return-home
-    // handed it straight back once the home was healthy, and ownership
-    // oscillated on a ~300 s period.
-    // Round-19: fleet/urls.json and heartbeats are bucket-writable
-    // inputs, and relays send the fleet-internal credential (sometimes a
-    // customer stream key) to whatever they name. Anything that is not a
-    // bare origin must be refused before it is stored.
-    #[test]
-    fn peer_urls_must_be_bare_origins() {
-        // Dev escape hatch on: plain http loopback is a valid origin.
-        let allow = |u: &str| valid_peer_url_with(u, true, None);
-        assert!(allow("https://cv-abc.fra.prisma.build"));
-        assert!(allow("http://127.0.0.1:8091"));
-        // userinfo, path, query, fragment, backslash, whitespace
-        assert!(!allow("https://evil@attacker.example"));
-        assert!(!allow("https://host.example/path"));
-        assert!(!allow("https://host.example?x=1"));
-        assert!(!allow("https://host.example#f"));
-        assert!(!allow("https://host.example\\@evil"));
-        assert!(!allow("https://host .example"));
-        // non-http schemes and bare hosts
-        assert!(!allow("file:///etc/passwd"));
-        assert!(!allow("host.example"));
-        assert!(!allow(""));
-        // non-numeric port
-        assert!(!allow("http://host.example:evil"));
-        // TLS mandatory once the dev escape hatch is off
-        let strict = |u: &str| valid_peer_url_with(u, false, None);
-        assert!(!strict("http://127.0.0.1:8091"));
-        assert!(strict("https://cv-abc.fra.prisma.build"));
-    }
-
-    #[test]
-    fn peer_domain_allowlist_is_enforced_when_set() {
-        let v = |u: &str| valid_peer_url_with(u, false, Some("prisma.build"));
-        assert!(v("https://cv-abc.fra.prisma.build"));
-        assert!(v("https://prisma.build"));
-        assert!(!v("https://attacker.example"));
-        // suffix-matching must not accept a lookalike domain
-        assert!(!v("https://evilprisma.build"));
-    }
-
-    #[test]
-    fn return_home_suppressed_at_fair_share() {
-        // home kept 1 of its 2 shards; mean is ceil(4/4)=1; returning
-        // would make 2 > 1 — the exact flap case.
-        assert!(!return_home_allowed(1, 1, 4, 4));
-    }
-
-    #[test]
-    fn drained_home_still_gets_refilled() {
-        // ladder p3: the once-lagged instance owns nothing; the mean is
-        // 1; refilling to 1 is exactly fair.
-        assert!(return_home_allowed(0, 1, 4, 4));
-    }
-
-    #[test]
-    fn fine_granularity_returns_normally() {
-        // 16 shards over 4 instances: home at 3 takes its 4th back.
-        assert!(return_home_allowed(3, 1, 16, 4));
-        assert!(!return_home_allowed(4, 1, 16, 4));
-    }
-
-    #[test]
-    fn multiple_pending_returns_share_the_budget() {
-        // two overrides pointing at the same healthy home in one pass:
-        // the second must count the first (16/4: home at 2, gains 1+1
-        // fine; a third would breach).
-        assert!(return_home_allowed(2, 1, 16, 4));
-        assert!(return_home_allowed(2, 2, 16, 4));
-        assert!(!return_home_allowed(2, 3, 16, 4));
-    }
-
-    #[test]
-    fn empty_active_set_never_returns() {
-        assert!(!return_home_allowed(0, 1, 4, 0));
-    }
-
-    #[test]
-    fn target_must_be_well_under_the_threshold_not_merely_under_it() {
-        // threshold/2 gate: a peer at 40s with a 60s threshold is not healthy
-        let p = peers(&[("a", 5.0, 0), ("b", 5.0, 40)]);
-        assert_eq!(pick_move_target(&p, "a", 60), None);
-    }
-
-    // Regression: victim was derived via shard_for_hash(lag_map_key), but
-    // the lag map is keyed by storage_hash while shards are chosen by
-    // stream_hash(name) - so it almost never matched and D3 never moved.
-    #[test]
-    fn victim_is_the_laggiest_shard_we_actually_serve() {
-        let lags = vec![
-            ("000".to_string(), 10),
-            ("011".to_string(), 90),
-            ("111".to_string(), 40),
-        ];
-        let served = vec!["000".to_string(), "111".to_string()];
-        // 011 is laggier but we do not serve it
-        assert_eq!(pick_victim_shard(&lags, &served).as_deref(), Some("111"));
-    }
-
-    #[test]
-    fn no_victim_when_we_serve_nothing_with_lag() {
-        let lags = vec![("011".to_string(), 90)];
-        let served = vec!["000".to_string()];
-        assert_eq!(pick_victim_shard(&lags, &served), None);
-    }
-
-    #[test]
-    fn no_victim_when_nothing_lags() {
-        let served = vec!["000".to_string()];
-        assert_eq!(pick_victim_shard(&[], &served), None);
-    }
-}
+mod tests;
diff --git a/src/fleet/tests.rs b/src/fleet/tests.rs
new file mode 100644
index 00000000..888cd6bc
--- /dev/null
+++ b/src/fleet/tests.rs
@@ -0,0 +1,145 @@
+//! The fleet loop's unit tests: peer choice, return-home budget and victim selection.
+#![cfg(test)]
+use super::*;
+use std::collections::HashMap;
+
+fn peers(v: &[(&str, f64, u64)]) -> HashMap<String, (f64, u64)> {
+    v.iter()
+        .map(|(n, c, l)| (n.to_string(), (*c, *l)))
+        .collect()
+}
+
+// Regression: ladder pass 3 did 7 moves in 10 minutes because moves
+// were allowed to peers that were themselves behind.
+#[test]
+fn target_is_the_coolest_healthy_peer() {
+    let p = peers(&[("a", 90.0, 0), ("b", 10.0, 0), ("c", 50.0, 0)]);
+    assert_eq!(pick_move_target(&p, "a", 60).as_deref(), Some("b"));
+}
+
+#[test]
+fn target_excludes_self() {
+    let p = peers(&[("a", 1.0, 0), ("b", 80.0, 0)]);
+    assert_eq!(pick_move_target(&p, "a", 60).as_deref(), Some("b"));
+}
+
+#[test]
+fn no_target_when_every_peer_is_also_lagging() {
+    // fleet-wide backlog: hold shards rather than pass them around
+    let p = peers(&[("a", 5.0, 90), ("b", 5.0, 80), ("c", 5.0, 70)]);
+    assert_eq!(pick_move_target(&p, "a", 60), None);
+}
+
+// Regression: FLEET-CAMPAIGN.md — 4 shards over 4 instances drew
+// 1/1/2/0; the rebalancer moved one off the 2-owner, return-home
+// handed it straight back once the home was healthy, and ownership
+// oscillated on a ~300 s period.
+// Round-19: fleet/urls.json and heartbeats are bucket-writable
+// inputs, and relays send the fleet-internal credential (sometimes a
+// customer stream key) to whatever they name. Anything that is not a
+// bare origin must be refused before it is stored.
+#[test]
+fn peer_urls_must_be_bare_origins() {
+    // Dev escape hatch on: plain http loopback is a valid origin.
+    let allow = |u: &str| valid_peer_url_with(u, true, None);
+    assert!(allow("https://cv-abc.fra.prisma.build"));
+    assert!(allow("http://127.0.0.1:8091"));
+    // userinfo, path, query, fragment, backslash, whitespace
+    assert!(!allow("https://evil@attacker.example"));
+    assert!(!allow("https://host.example/path"));
+    assert!(!allow("https://host.example?x=1"));
+    assert!(!allow("https://host.example#f"));
+    assert!(!allow("https://host.example\\@evil"));
+    assert!(!allow("https://host .example"));
+    // non-http schemes and bare hosts
+    assert!(!allow("file:///etc/passwd"));
+    assert!(!allow("host.example"));
+    assert!(!allow(""));
+    // non-numeric port
+    assert!(!allow("http://host.example:evil"));
+    // TLS mandatory once the dev escape hatch is off
+    let strict = |u: &str| valid_peer_url_with(u, false, None);
+    assert!(!strict("http://127.0.0.1:8091"));
+    assert!(strict("https://cv-abc.fra.prisma.build"));
+}
+
+#[test]
+fn peer_domain_allowlist_is_enforced_when_set() {
+    let v = |u: &str| valid_peer_url_with(u, false, Some("prisma.build"));
+    assert!(v("https://cv-abc.fra.prisma.build"));
+    assert!(v("https://prisma.build"));
+    assert!(!v("https://attacker.example"));
+    // suffix-matching must not accept a lookalike domain
+    assert!(!v("https://evilprisma.build"));
+}
+
+#[test]
+fn return_home_suppressed_at_fair_share() {
+    // home kept 1 of its 2 shards; mean is ceil(4/4)=1; returning
+    // would make 2 > 1 — the exact flap case.
+    assert!(!return_home_allowed(1, 1, 4, 4));
+}
+
+#[test]
+fn drained_home_still_gets_refilled() {
+    // ladder p3: the once-lagged instance owns nothing; the mean is
+    // 1; refilling to 1 is exactly fair.
+    assert!(return_home_allowed(0, 1, 4, 4));
+}
+
+#[test]
+fn fine_granularity_returns_normally() {
+    // 16 shards over 4 instances: home at 3 takes its 4th back.
+    assert!(return_home_allowed(3, 1, 16, 4));
+    assert!(!return_home_allowed(4, 1, 16, 4));
+}
+
+#[test]
+fn multiple_pending_returns_share_the_budget() {
+    // two overrides pointing at the same healthy home in one pass:
+    // the second must count the first (16/4: home at 2, gains 1+1
+    // fine; a third would breach).
+    assert!(return_home_allowed(2, 1, 16, 4));
+    assert!(return_home_allowed(2, 2, 16, 4));
+    assert!(!return_home_allowed(2, 3, 16, 4));
+}
+
+#[test]
+fn empty_active_set_never_returns() {
+    assert!(!return_home_allowed(0, 1, 4, 0));
+}
+
+#[test]
+fn target_must_be_well_under_the_threshold_not_merely_under_it() {
+    // threshold/2 gate: a peer at 40s with a 60s threshold is not healthy
+    let p = peers(&[("a", 5.0, 0), ("b", 5.0, 40)]);
+    assert_eq!(pick_move_target(&p, "a", 60), None);
+}
+
+// Regression: victim was derived via shard_for_hash(lag_map_key), but
+// the lag map is keyed by storage_hash while shards are chosen by
+// stream_hash(name) - so it almost never matched and D3 never moved.
+#[test]
+fn victim_is_the_laggiest_shard_we_actually_serve() {
+    let lags = vec![
+        ("000".to_string(), 10),
+        ("011".to_string(), 90),
+        ("111".to_string(), 40),
+    ];
+    let served = vec!["000".to_string(), "111".to_string()];
+    // 011 is laggier but we do not serve it
+    assert_eq!(pick_victim_shard(&lags, &served).as_deref(), Some("111"));
+}
+
+#[test]
+fn no_victim_when_we_serve_nothing_with_lag() {
+    let lags = vec![("011".to_string(), 90)];
+    let served = vec!["000".to_string()];
+    assert_eq!(pick_victim_shard(&lags, &served), None);
+}
+
+#[test]
+fn no_victim_when_nothing_lags() {
+    let served = vec!["000".to_string()];
+    assert_eq!(pick_victim_shard(&[], &served), None);
+}
diff --git a/src/history/canonical_span.rs b/src/history/canonical_span.rs
index df867e90..014b9638 100644
--- a/src/history/canonical_span.rs
+++ b/src/history/canonical_span.rs
@@ -25,7 +25,10 @@ impl ResultPage {
         true
     }
 }
-#[allow(clippy::too_many_arguments)]
+#[expect(
+    clippy::too_many_arguments,
+    reason = "read; the canonical span read takes the partition, route, incarnation, range, filter, budget and sink the gather planned separately; a request struct would restate the plan per span"
+)]
 pub(super) async fn read(
     part: &Arc<Db>,
     route: RouteHash,
diff --git a/src/history/controller_tests.rs b/src/history/controller_tests.rs
index 2bf0cdf9..af569ba2 100644
--- a/src/history/controller_tests.rs
+++ b/src/history/controller_tests.rs
@@ -4,6 +4,14 @@ use crate::shard::{AppendFinish, AppendReq, ShardConfig};
 use bytes::Bytes;
 use std::sync::atomic::Ordering;
 
+#[expect(
+    clippy::too_many_lines,
+    reason = "active_absorber_cancel; the fixture stages the engine, the held store, the absorber and its cancellation in the order the scenario requires; splitting it would separate the stages from the cancellation they set up"
+)]
+#[expect(
+    clippy::let_underscore_must_use,
+    reason = "active_absorber_cancel; the fixture closes the database and partition on the way out; a failed close leaves nothing the assertions depend on"
+)]
 async fn active_absorber_cancel(hold_store: bool) {
     let shard_store: Arc<dyn ObjectStore> = Arc::new(object_store::memory::InMemory::new());
     let data_store = FaultStore::uniform(
diff --git a/src/history/postings_validation_tests.rs b/src/history/postings_validation_tests.rs
index 26f223c0..8b4441c5 100644
--- a/src/history/postings_validation_tests.rs
+++ b/src/history/postings_validation_tests.rs
@@ -160,6 +160,14 @@ async fn o4a_valid_page_seams_and_match_free_progress_remain_usable() {
     db.close().await.unwrap();
 }
 
+#[expect(
+    clippy::cast_possible_truncation,
+    reason = "raw_page; the fixture's run counts are small tables it wrote itself; a checked conversion would only restate the fixture"
+)]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "raw_page; the fixture nests the varint continuation bit inside the per-field encoding loop of each run; flattening it would separate the bit from the field it continues"
+)]
 fn raw_page(first: u64, end: u64, total: u64, runs: &[[u64; 4]]) -> Vec<u8> {
     let mut value = vec![1, 0];
     value.extend_from_slice(&first.to_le_bytes());
diff --git a/src/history/worker.rs b/src/history/worker.rs
index ac4eeb1e..9ad791d0 100644
--- a/src/history/worker.rs
+++ b/src/history/worker.rs
@@ -303,6 +303,10 @@ impl Absorber {
         }
         v2_lane
     }
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "Absorber::gather_due; the outcome handling nests the per-stream bookkeeping inside the advanced, partial, no-work and failed arms of one gather; flattening it would separate the bookkeeping from the outcome that decides it"
+    )]
     async fn gather_due(
         &self,
         pending: &mut HashMap<[u8; 16], PendingAbsorb>,
diff --git a/src/main.rs b/src/main.rs
index 0cb49aab..5ce9cc0d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,6 +8,10 @@
 #[global_allocator]
 static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
 
+#[expect(
+    clippy::disallowed_methods,
+    reason = "main; the Tokio worker floor is process configuration read once before any runtime, supervisor or configuration owner exists; routing it through an owner would need the runtime it sizes"
+)]
 fn main() -> anyhow::Result<()> {
     tracing_subscriber::fmt()
         .with_env_filter(
diff --git a/src/mt_lint.rs b/src/mt_lint.rs
index 703f2632..61a0c163 100644
--- a/src/mt_lint.rs
+++ b/src/mt_lint.rs
@@ -147,6 +147,10 @@ impl<'a> Lint<'a> {
         }
     }
 
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "Lint::check_signature; the signature walk nests the type and name checks inside each typed input; flattening it would separate the checks from the input they classify"
+    )]
     fn check_signature(&mut self, line: usize, name: &str, sig: &syn::Signature) {
         let mut has_sref_param = false;
         let mut name_params: Vec<(String, String)> = Vec::new();
@@ -357,6 +361,10 @@ fn multitenancy_identity_lint() {
     // Recursive: new submodules are scanned the day they appear.
     // src/dst/ (harness + tests) and src/bin/ (single-tenant client
     // tools) stay out by directory.
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "walk; the directory walk nests the excluded-tree check inside the directory branch; flattening it would separate the exclusion from the directory it prunes"
+    )]
     fn walk(root: &std::path::Path, dir: &std::path::Path, out: &mut Vec<std::path::PathBuf>) {
         for e in std::fs::read_dir(dir).unwrap().filter_map(|e| e.ok()) {
             let p = e.path();
diff --git a/src/offsets.rs b/src/offsets.rs
index d5676d62..ed44f622 100644
--- a/src/offsets.rs
+++ b/src/offsets.rs
@@ -71,7 +71,10 @@ fn decode_char(ch: char) -> Option<u8> {
         'I' | 'i' | 'L' | 'l' => Some(1),
         _ => {
             let up = ch.to_ascii_uppercase() as u8;
-            ALPHABET.iter().position(|&a| a == up).map(|p| p as u8)
+            ALPHABET
+                .iter()
+                .position(|&a| a == up)
+                .and_then(|p| u8::try_from(p).ok())
         }
     }
 }
diff --git a/src/postings_cache.rs b/src/postings_cache.rs
index f4aacddd..b5fea3a9 100644
--- a/src/postings_cache.rs
+++ b/src/postings_cache.rs
@@ -194,7 +194,15 @@ impl PostingsCache {
         clippy::unwrap_used,
         reason = "PostingsCache::install_chunk; a poisoned cache index may hold a partially installed slice or in-flight load; recovering it could serve a truncated postings slice or miscount resident bytes"
     )]
-    pub fn install_chunk(
+    #[expect(
+        clippy::too_many_lines,
+        reason = "PostingsCache::install_chunk; installing a chunk decides replacement, bridging, fresh admission and eviction against one index snapshot; splitting it would separate the decisions from the snapshot they share"
+    )]
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "PostingsCache::install_chunk; the install nests the bridge and eviction verdicts inside the resident-slice branches under the index lock; flattening them would separate the verdicts from the slice they judge"
+    )]
+    pub(crate) fn install_chunk(
         &self,
         inc: SegmentHash,
         chunk_from: u64,
@@ -416,7 +424,15 @@ impl PostingsCache {
         clippy::unwrap_used,
         reason = "PostingsCache::runs_for; a poisoned cache index may hold a partially installed slice or in-flight load; recovering it could serve a truncated postings slice or miscount resident bytes"
     )]
-    pub async fn runs_for(
+    #[expect(
+        clippy::too_many_lines,
+        reason = "PostingsCache::runs_for; serving runs decides the resident, loading and corrupt paths against one index snapshot; splitting it would separate the paths from the snapshot they share"
+    )]
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "PostingsCache::runs_for; the lookup nests the coverage and corruption verdicts inside the resident and in-flight branches under the index lock; flattening them would separate the verdicts from the entry they judge"
+    )]
+    pub(crate) async fn runs_for(
         self: &Arc<Self>,
         part: &Arc<Db>,
         route: RouteHash,
@@ -623,6 +639,10 @@ impl PostingsCache {
         clippy::unwrap_used,
         reason = "PostingsCache::spawn_load; a poisoned cache index may hold a partially installed slice or in-flight load; recovering it could serve a truncated postings slice or miscount resident bytes"
     )]
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "PostingsCache::spawn_load; the loader nests the admission of the loaded runs inside the completion branch of the spawned load; flattening it would separate the admission from the load it admits"
+    )]
     fn spawn_load(
         self: &Arc<Self>,
         part: Arc<Db>,
diff --git a/src/product_cursor.rs b/src/product_cursor.rs
index 86eafa13..a84bbfc2 100644
--- a/src/product_cursor.rs
+++ b/src/product_cursor.rs
@@ -44,6 +44,10 @@ pub(crate) struct KeyCursor {
 /// stream key and epoch — a cursor minted for one project's stream
 /// can never authenticate against another project's same-named,
 /// same-keyed stream.
+#[expect(
+    clippy::expect_used,
+    reason = "mac_key; HMAC-SHA256 accepts a key of any length, so construction from the derived key cannot fail; a fallible path would add a branch no key reaches"
+)]
 fn mac_key(project: &crate::tenant::ProjectId, key: &StreamKey, epoch: &[u8; 16]) -> [u8; 32] {
     use hmac::{Hmac, Mac};
     use sha2::Sha256;
@@ -56,6 +60,10 @@ fn mac_key(project: &crate::tenant::ProjectId, key: &StreamKey, epoch: &[u8; 16]
     out
 }
 
+#[expect(
+    clippy::expect_used,
+    reason = "mac16; HMAC-SHA256 accepts a key of any length, so construction from the derived key cannot fail; a fallible path would add a branch no key reaches"
+)]
 fn mac16(k: &[u8; 32], payload: &[u8]) -> [u8; MAC_LEN] {
     use hmac::{Hmac, Mac};
     use sha2::Sha256;
@@ -129,7 +137,7 @@ impl CatalogCursor {
         let pb = self.project.as_str().as_bytes();
         let mut p = Vec::with_capacity(1 + 2 + pb.len() + self.last_name.len() + MAC_LEN);
         p.push(KIND_CATALOG_V1);
-        p.extend_from_slice(&(pb.len() as u16).to_le_bytes());
+        p.extend_from_slice(&u16::try_from(pb.len()).unwrap_or(u16::MAX).to_le_bytes());
         p.extend_from_slice(pb);
         p.extend_from_slice(self.last_name.as_bytes());
         if let Some(k) = key {
@@ -146,7 +154,11 @@ impl ScanCursor {
         p.push(KIND_SCAN_V2);
         p.extend_from_slice(&self.epoch);
         p.extend_from_slice(&self.map_version.to_le_bytes());
-        p.extend_from_slice(&(self.segments.len() as u32).to_le_bytes());
+        p.extend_from_slice(
+            &u32::try_from(self.segments.len())
+                .unwrap_or(u32::MAX)
+                .to_le_bytes(),
+        );
         for (id, end) in &self.segments {
             p.extend_from_slice(&id.to_le_bytes());
             p.extend_from_slice(&end.to_le_bytes());
diff --git a/src/project_policy.rs b/src/project_policy.rs
index 2d692512..6ee67df8 100644
--- a/src/project_policy.rs
+++ b/src/project_policy.rs
@@ -13,7 +13,10 @@
 //! Stage 5 wires the real snapshot/delta feed without touching the
 //! verification logic.
 
-#![allow(dead_code)] // consumed across MT Stages 2b/4/5 as wiring lands
+#![allow(
+    dead_code,
+    reason = "project_policy; the policy types are consumed across MT Stages 2b/4/5 as their wiring lands; removing them now would re-add each one with its stage"
+)]
 
 use std::collections::HashMap;
 use std::sync::Arc;
diff --git a/src/quota.rs b/src/quota.rs
index a46b47a3..079db74c 100644
--- a/src/quota.rs
+++ b/src/quota.rs
@@ -518,6 +518,10 @@ impl QuotaRegistry {
         clippy::unwrap_used,
         reason = "QuotaRegistry::admit; a poisoned entry or project map may be partially updated; recovery could mint fresh request credit or orphan charged state"
     )]
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "QuotaRegistry::admit; admission nests the idle eviction inside the untracked-project branch of the tracker lookup; flattening it would separate the eviction from the refusal it forestalls"
+    )]
     pub(crate) fn admit(
         &self,
         project: &ProjectId,
@@ -623,7 +627,11 @@ impl QuotaRegistry {
         clippy::unwrap_used,
         reason = "QuotaRegistry::admit_append; either poisoned bucket or its project map may contain an incomplete charge; recovery could admit beyond a limit or charge only half a batch"
     )]
-    pub fn admit_append(
+    #[expect(
+        clippy::too_many_arguments,
+        reason = "QuotaRegistry::admit_append; append admission takes the project, its quotas, the payload size and the clock parts separately as the request resolved them; a request struct would exist only for this signature"
+    )]
+    pub(crate) fn admit_append(
         &self,
         project: &ProjectId,
         quotas: &ProjectQuotas,
diff --git a/src/runtime.rs b/src/runtime.rs
index 79b35ef7..e4854286 100644
--- a/src/runtime.rs
+++ b/src/runtime.rs
@@ -47,6 +47,10 @@ impl TrustedNow {
 pub(crate) struct MonotonicNow(Duration);
 
 impl MonotonicNow {
+    #[expect(
+        clippy::cast_possible_truncation,
+        reason = "MonotonicNow::millis; the millisecond count is clamped to i64::MAX before the cast; a checked conversion would only restate the clamp"
+    )]
     pub(crate) fn millis(self) -> i64 {
         self.0.as_millis().min(i64::MAX as u128) as i64
     }
@@ -88,6 +92,10 @@ impl Default for SystemClock {
 }
 
 impl Clock for SystemClock {
+    #[expect(
+        clippy::cast_possible_truncation,
+        reason = "SystemClock::now; the Unix millisecond count stays below i64::MAX for hundreds of millions of years; a checked conversion would only restate that horizon"
+    )]
     fn now(&self) -> TrustedNow {
         TrustedNow(
             std::time::SystemTime::now()
@@ -199,8 +207,9 @@ impl RuntimeCaps {
     /// Assemble from explicit implementations with ONE entropy source
     /// for both the boot id and later epochs (production goes through
     /// [`RuntimeCaps::production`]).
-    pub fn with(clock: Arc<dyn Clock>, entropy: Arc<dyn Entropy>, instance: &str) -> Self {
-        Self::with_sources(clock, &*entropy, entropy.clone(), instance)
+    pub(crate) fn with(clock: Arc<dyn Clock>, entropy: Arc<dyn Entropy>, instance: &str) -> Self {
+        let boot = entropy.clone();
+        Self::with_sources(clock, &*boot, entropy, instance)
     }
 
     /// Assemble with DOMAIN-SEPARATED sources (PR 4.1): the boot id is
@@ -296,6 +305,10 @@ impl ManualClock {
     }
 
     /// Ordinary passage of time: both domains move together.
+    #[expect(
+        clippy::cast_possible_truncation,
+        reason = "ManualClock::advance; test clock advances are small fixture durations; a checked conversion would only restate the fixture's scale"
+    )]
     pub(crate) fn advance(&self, by: Duration) {
         *self.inner.wall_ms.lock().unwrap() += by.as_millis() as i64;
         self.advance_monotonic(by);
@@ -324,6 +337,10 @@ impl Clock for ManualClock {
         MonotonicNow(*self.inner.mono.lock().unwrap())
     }
 
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "ManualClock::sleep; the wake loop nests the deadline check between registering for the next advance and awaiting it; flattening it would separate the check from the registration that makes it race-free"
+    )]
     fn sleep(&self, d: Duration) -> futures_util::future::BoxFuture<'static, ()> {
         let inner = self.inner.clone();
         let deadline = *inner.mono.lock().unwrap() + d;
diff --git a/src/runtime/telemetry.rs b/src/runtime/telemetry.rs
index c93f4331..100b90b3 100644
--- a/src/runtime/telemetry.rs
+++ b/src/runtime/telemetry.rs
@@ -74,6 +74,10 @@ mod tests {
         config
     }
 
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "r10_telemetry_cache_progress_and_database_lifetimes_are_runtime_owned; the fixture nests the release wait inside the timeout that bounds it inside the test; flattening it would separate the wait from the bound it must respect"
+    )]
     #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
     async fn r10_telemetry_cache_progress_and_database_lifetimes_are_runtime_owned() {
         let clock = Arc::new(ManualClock::at(1000));
diff --git a/src/scaler3.rs b/src/scaler3.rs
index f9d5934f..be03333f 100644
--- a/src/scaler3.rs
+++ b/src/scaler3.rs
@@ -148,6 +148,13 @@ impl State {
         self.hot_keys.retain(|name, _| live.contains(name));
     }
 
+    #[cfg_attr(
+        test,
+        expect(
+            clippy::excessive_nesting,
+            reason = "State::forget_previous_incarnation; the test-only visit counter nests inside the retain closure of the incarnation sweep; flattening it would separate the count from the sweep it audits"
+        )
+    )]
     fn forget_previous_incarnation(&mut self, name: &crate::tenant::TenantStreamRef, epoch: &str) {
         #[cfg(test)]
         let mut visited = 0;
@@ -365,11 +372,7 @@ fn evaluate_state(
             if let Some((k, _)) = top.top_share() {
                 hot_updates
                     .entry(name.clone())
-                    .and_modify(|prior| {
-                        if k < prior.0 {
-                            *prior = RoutingKeyHash(k);
-                        }
-                    })
+                    .and_modify(|prior| prior.0 = prior.0.min(k))
                     .or_insert(RoutingKeyHash(k));
             }
             INEFFECTIVE_SPLIT_AVOIDED.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
@@ -788,6 +791,10 @@ mod tests {
         assert!(state.hot_keys.is_empty());
     }
 
+    #[expect(
+        clippy::cast_possible_truncation,
+        reason = "segment_order_cannot_erase_a_hot_key_or_change_decisions; the fixture's segment ids are 0, 1 and 2; a checked conversion would only restate the fixture"
+    )]
     #[test]
     fn segment_order_cannot_erase_a_hot_key_or_change_decisions() {
         let name = test_desc("hot-and-cold").sref();
diff --git a/src/sse/session.rs b/src/sse/session.rs
index d467e1de..1c2bab37 100644
--- a/src/sse/session.rs
+++ b/src/sse/session.rs
@@ -155,7 +155,26 @@ fn count_cutoff(reason: super::feed::SourceCutoff) {
 /// here (finding 9). The caller builds the initial read source
 /// (`SingleSource` for single-segment/fork streams, `LineageSource`
 /// for connect-time lineage, Stage 7A).
-#[allow(clippy::too_many_arguments)]
+#[expect(
+    clippy::too_many_arguments,
+    reason = "serve; the session takes the state, the surface, the descriptor, key, params, headers and lease parts as the handler authorized them; a request struct would restate the authorization"
+)]
+#[expect(
+    clippy::too_many_lines,
+    reason = "serve; the session is one subscribe, drive and stream sequence whose teardown depends on which step admitted it; splitting it would separate the steps from the teardown they order"
+)]
+#[expect(
+    clippy::excessive_nesting,
+    reason = "serve; the driver nests the lease, version and generation waits and the take verdicts inside the drive loop of the spawned task; flattening them would separate each wake from the verdict it produces"
+)]
+#[expect(
+    clippy::let_underscore_must_use,
+    reason = "serve; the changed waits are only registrations on watches the driver already owns; handled results would only restate the registration"
+)]
+#[expect(
+    clippy::disallowed_methods,
+    reason = "serve; the driver task is owned by the subscription it drives and ends with it; a supervised driver would tie a request-scoped task to the runtime supervisor"
+)]
 pub(crate) async fn serve(
     state: Arc<AppState>,
     desc: crate::registry::StreamDesc,
@@ -277,7 +296,7 @@ pub(crate) async fn serve(
         },
         rk_hash: crate::crypto::stream_hash(&lane_rk),
         epoch,
-        key: key.clone(),
+        key,
         desc: desc.clone(),
         raw_cursor: params.cursor.clone(),
     };
@@ -293,7 +312,7 @@ pub(crate) async fn serve(
     crate::billing::meter_read(&state, &desc, 0, 0);
     let body_state = state.clone();
 
-    let task_state = state.clone();
+    let task_state = state;
     let task_desc = desc.clone();
     let task_lease = SseLease::of(&params);
     #[cfg(test)]
@@ -818,16 +837,14 @@ pub(crate) async fn serve(
                         // did NOT change and the version was NOT bumped —
                         // park rather than spin (finding 6). The next
                         // durable advance or the heartbeat retries.
-                        Some(DriveOutcome::NoProgress) => {}
+                        // Idle means the head already covers the frontier;
+                        // None means another driver won and its publication
+                        // bumps ver_wait (registered at loop top).
+                        Some(DriveOutcome::NoProgress | DriveOutcome::Idle) | None => {}
                         Some(DriveOutcome::SourceFailed) => {
                             tracing::warn!("livefeed source read failed; parking until next wake");
                         }
-                        // Head already covers the frontier: nothing to do.
-                        Some(DriveOutcome::Idle) => {}
                         Some(DriveOutcome::Cancelled) => return,
-                        // Contended: park; the winner's publication bumps
-                        // ver_wait (registered at loop top).
-                        None => {}
                     }
                 }
                 // Round-11.4 fleet finding: an at-tail session has no
@@ -894,6 +911,10 @@ pub(crate) fn feed_key_of(
     }
 }
 
+#[expect(
+    clippy::unwrap_used,
+    reason = "response_from_stream; the response builder only carries the fixed content-type and cache headers the session sets, so it cannot fail; a fallible build would add a branch no session reaches"
+)]
 fn response_from_stream(
     stream: impl futures_util::Stream<Item = Result<Bytes, std::io::Error>> + Send + 'static,
     binary: bool,
@@ -924,145 +945,4 @@ fn response_from_stream(
 // name the ACTUAL live segment, not hard-coded zero.
 // ==================================================================
 #[cfg(test)]
-mod tests {
-    use super::*;
-
-    /// A materialized one-segment map whose only live segment has a
-    /// NONZERO id (a lineage pruned down to a later segment) meets the
-    /// LiveFeed eligibility condition — and its cursors must name that
-    /// segment.
-    #[test]
-    fn product_cursor_names_the_actual_live_segment() {
-        let mut desc = crate::sse::feed::tests::test_desc("segtest").to_persisted();
-        desc.segments = Some(crate::segmap::SegmentMap {
-            version: 7,
-            next_seg_id: 6,
-            pending: None,
-            segments: vec![crate::segmap::SegmentDesc {
-                seg_id: 5,
-                lo: 0,
-                hi: crate::segmap::KEYSPACE_END,
-                shard_prefix: String::new(),
-                route_hash: [0u8; 16],
-                created_ms: 1,
-                predecessors: vec![0],
-                successors: Vec::new(),
-                sealed_ms: None,
-                sealed_next_offset: None,
-            }],
-        });
-        let desc = crate::registry::StreamDesc::try_from(desc).unwrap();
-        let key = crate::crypto::StreamKey([9u8; 32]);
-        let epoch = [3u8; 16];
-        let lane_rk = String::new();
-        let ctx = SessionCtx {
-            surface: Surface::Product,
-            rk_hash: crate::crypto::stream_hash(&lane_rk),
-            epoch,
-            key: key.clone(),
-            desc: desc.clone(),
-            raw_cursor: None,
-        };
-        let seg_id = desc.resolve_segment(&lane_rk).seg_id;
-        assert_eq!(seg_id, 5, "resolve must find the nonzero live segment");
-
-        // The emitted bare cursor control carries a KeyCursor naming
-        // segment 5, decodable and authenticated.
-        let ctl = ctx.record_ctl(
-            crate::sse::feed::WirePosition {
-                seg_id,
-                local_after: 42,
-            },
-            false,
-        );
-        let text = String::from_utf8(ctl.to_vec()).unwrap();
-        let tok = text
-            .split("\"nextCursor\":\"")
-            .nth(1)
-            .and_then(|rest| rest.split('"').next())
-            .expect("product control carries nextCursor");
-        let kc = crate::product_cursor::KeyCursor::decode(
-            tok,
-            &desc.project_id,
-            &key,
-            &epoch,
-            &ctx.rk_hash,
-        )
-        .expect("cursor decodes");
-        assert_eq!(kc.seg_id, 5, "the cursor names the actual segment");
-        assert_eq!(kc.offset, 42);
-
-        // And the standalone status control names it too.
-        let status = ctx.status_ctl(
-            crate::sse::feed::WirePosition {
-                seg_id,
-                local_after: 42,
-            },
-            false,
-        );
-        let text = String::from_utf8(status.to_vec()).unwrap();
-        let tok = text
-            .split("\"nextCursor\":\"")
-            .nth(1)
-            .and_then(|rest| rest.split('"').next())
-            .expect("status control carries nextCursor");
-        let kc = crate::product_cursor::KeyCursor::decode(
-            tok,
-            &desc.project_id,
-            &key,
-            &epoch,
-            &ctx.rk_hash,
-        )
-        .expect("status cursor decodes");
-        assert_eq!(kc.seg_id, 5);
-    }
-
-    /// Finding 7 (identity): the feed identity leg IS the domain-
-    /// separated storage hash — distinct incarnations never share a
-    /// feed, and the derivation matches the storage keyspace identity.
-    #[test]
-    fn feed_identity_is_the_storage_hash() {
-        let desc = crate::sse::feed::tests::test_desc("ident");
-        let key = feed_key_of(&desc, &None);
-        assert_eq!(key.identity, desc.storage_hash());
-        let mut other = crate::sse::feed::tests::test_desc("ident").to_persisted();
-        other.stream_epoch = "ffffffffffffffffffffffffffffffff".into();
-        let other = crate::registry::StreamDesc::try_from(other).unwrap();
-        assert_ne!(
-            feed_key_of(&other, &None).identity,
-            key.identity,
-            "a recreated stream (new epoch) is a new feed identity"
-        );
-    }
-
-    /// Finding 10 coverage: bytes_out accounts EXACTLY the emitted
-    /// frame bytes — one counter increment per body chunk, no more,
-    /// no less (deterministic: a private Counters, no global state).
-    #[tokio::test]
-    async fn bytes_out_accounts_exactly_the_emitted_frames() {
-        let usage = std::sync::Arc::new(crate::usage::Counters::default());
-        let chunks: Vec<Result<Bytes, std::io::Error>> = vec![
-            Ok(Bytes::from_static(b"event: data\ndata:AAEC\n\n")),
-            Ok(Bytes::from_static(b"event: control\ndata:{}\n\n")),
-            Ok(Bytes::from_static(b": keep-alive\n\n")),
-        ];
-        let want: usize = chunks.iter().map(|c| c.as_ref().unwrap().len()).sum();
-        let resp = response_from_stream(futures_util::stream::iter(chunks), true, &usage);
-        assert_eq!(
-            resp.headers()
-                .get("stream-sse-data-encoding")
-                .and_then(|v| v.to_str().ok()),
-            Some("base64"),
-            "binary bodies carry the encoding header"
-        );
-        let body = axum::body::to_bytes(resp.into_body(), usize::MAX)
-            .await
-            .unwrap();
-        assert_eq!(body.len(), want);
-        assert_eq!(
-            usage.bytes_out.load(Ordering::Relaxed),
-            want as u64,
-            "bytes_out IS the emitted frame bytes, exactly"
-        );
-    }
-}
+mod tests;
diff --git a/src/sse/session/tests.rs b/src/sse/session/tests.rs
new file mode 100644
index 00000000..3bfcbfaf
--- /dev/null
+++ b/src/sse/session/tests.rs
@@ -0,0 +1,132 @@
+//! The SSE session's unit tests.
+#![cfg(test)]
+use super::*;
+
+/// A materialized one-segment map whose only live segment has a
+/// NONZERO id (a lineage pruned down to a later segment) meets the
+/// LiveFeed eligibility condition — and its cursors must name that
+/// segment.
+#[test]
+fn product_cursor_names_the_actual_live_segment() {
+    let mut desc = crate::sse::feed::tests::test_desc("segtest").to_persisted();
+    desc.segments = Some(crate::segmap::SegmentMap {
+        version: 7,
+        next_seg_id: 6,
+        pending: None,
+        segments: vec![crate::segmap::SegmentDesc {
+            seg_id: 5,
+            lo: 0,
+            hi: crate::segmap::KEYSPACE_END,
+            shard_prefix: String::new(),
+            route_hash: [0u8; 16],
+            created_ms: 1,
+            predecessors: vec![0],
+            successors: Vec::new(),
+            sealed_ms: None,
+            sealed_next_offset: None,
+        }],
+    });
+    let desc = crate::registry::StreamDesc::try_from(desc).unwrap();
+    let key = crate::crypto::StreamKey([9u8; 32]);
+    let epoch = [3u8; 16];
+    let lane_rk = String::new();
+    let ctx = SessionCtx {
+        surface: Surface::Product,
+        rk_hash: crate::crypto::stream_hash(&lane_rk),
+        epoch,
+        key: key.clone(),
+        desc: desc.clone(),
+        raw_cursor: None,
+    };
+    let seg_id = desc.resolve_segment(&lane_rk).seg_id;
+    assert_eq!(seg_id, 5, "resolve must find the nonzero live segment");
+
+    // The emitted bare cursor control carries a KeyCursor naming
+    // segment 5, decodable and authenticated.
+    let ctl = ctx.record_ctl(
+        crate::sse::feed::WirePosition {
+            seg_id,
+            local_after: 42,
+        },
+        false,
+    );
+    let text = String::from_utf8(ctl.to_vec()).unwrap();
+    let tok = text
+        .split("\"nextCursor\":\"")
+        .nth(1)
+        .and_then(|rest| rest.split('"').next())
+        .expect("product control carries nextCursor");
+    let kc =
+        crate::product_cursor::KeyCursor::decode(tok, &desc.project_id, &key, &epoch, &ctx.rk_hash)
+            .expect("cursor decodes");
+    assert_eq!(kc.seg_id, 5, "the cursor names the actual segment");
+    assert_eq!(kc.offset, 42);
+
+    // And the standalone status control names it too.
+    let status = ctx.status_ctl(
+        crate::sse::feed::WirePosition {
+            seg_id,
+            local_after: 42,
+        },
+        false,
+    );
+    let text = String::from_utf8(status.to_vec()).unwrap();
+    let tok = text
+        .split("\"nextCursor\":\"")
+        .nth(1)
+        .and_then(|rest| rest.split('"').next())
+        .expect("status control carries nextCursor");
+    let kc =
+        crate::product_cursor::KeyCursor::decode(tok, &desc.project_id, &key, &epoch, &ctx.rk_hash)
+            .expect("status cursor decodes");
+    assert_eq!(kc.seg_id, 5);
+}
+
+/// Finding 7 (identity): the feed identity leg IS the domain-
+/// separated storage hash — distinct incarnations never share a
+/// feed, and the derivation matches the storage keyspace identity.
+#[test]
+fn feed_identity_is_the_storage_hash() {
+    let desc = crate::sse::feed::tests::test_desc("ident");
+    let key = feed_key_of(&desc, &None);
+    assert_eq!(key.identity, desc.storage_hash());
+    let mut other = crate::sse::feed::tests::test_desc("ident").to_persisted();
+    other.stream_epoch = "ffffffffffffffffffffffffffffffff".into();
+    let other = crate::registry::StreamDesc::try_from(other).unwrap();
+    assert_ne!(
+        feed_key_of(&other, &None).identity,
+        key.identity,
+        "a recreated stream (new epoch) is a new feed identity"
+    );
+}
+
+/// Finding 10 coverage: bytes_out accounts EXACTLY the emitted
+/// frame bytes — one counter increment per body chunk, no more,
+/// no less (deterministic: a private Counters, no global state).
+#[tokio::test]
+async fn bytes_out_accounts_exactly_the_emitted_frames() {
+    let usage = std::sync::Arc::new(crate::usage::Counters::default());
+    let chunks: Vec<Result<Bytes, std::io::Error>> = vec![
+        Ok(Bytes::from_static(b"event: data\ndata:AAEC\n\n")),
+        Ok(Bytes::from_static(b"event: control\ndata:{}\n\n")),
+        Ok(Bytes::from_static(b": keep-alive\n\n")),
+    ];
+    let want: usize = chunks.iter().map(|c| c.as_ref().unwrap().len()).sum();
+    let resp = response_from_stream(futures_util::stream::iter(chunks), true, &usage);
+    assert_eq!(
+        resp.headers()
+            .get("stream-sse-data-encoding")
+            .and_then(|v| v.to_str().ok()),
+        Some("base64"),
+        "binary bodies carry the encoding header"
+    );
+    let body = axum::body::to_bytes(resp.into_body(), usize::MAX)
+        .await
+        .unwrap();
+    assert_eq!(body.len(), want);
+    assert_eq!(
+        usage.bytes_out.load(Ordering::Relaxed),
+        want as u64,
+        "bytes_out IS the emitted frame bytes, exactly"
+    );
+}
diff --git a/src/tasks/shutdown.rs b/src/tasks/shutdown.rs
index 917bf0a2..1dc344e5 100644
--- a/src/tasks/shutdown.rs
+++ b/src/tasks/shutdown.rs
@@ -13,6 +13,10 @@ type Finalizer = (
 impl TaskSupervisor {
     /// A terminal error without proof of resource termination requires the
     /// owner's replacement fence and readiness failure to remain in place.
+    #[expect(
+        clippy::unwrap_used,
+        reason = "TaskSupervisor::incomplete_shutdown_failure; a poisoned supervisor state may hold a half-recorded phase, task map or report; recovering it could report a shutdown that never completed or hide one that failed"
+    )]
     pub(crate) fn incomplete_shutdown_failure(&self) -> Option<String> {
         let state = self.inner.state.lock().unwrap();
         if state.phase != Phase::ShuttingDown {
@@ -33,6 +37,22 @@ impl TaskSupervisor {
         self.launch_shutdown(grace, Some((label, Box::pin(finalizer))));
     }
 
+    #[expect(
+        clippy::unwrap_used,
+        reason = "TaskSupervisor::launch_shutdown; a poisoned supervisor state may hold a half-recorded phase, task map or report; recovering it could report a shutdown that never completed or hide one that failed"
+    )]
+    #[expect(
+        clippy::disallowed_methods,
+        reason = "TaskSupervisor::launch_shutdown; the shutdown driver outlives the supervised set it joins and publishes the report every observer waits on; a supervised driver would wait on itself"
+    )]
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "TaskSupervisor::launch_shutdown; the driver nests the phase decision inside the report publication inside the spawned shutdown; flattening it would separate the phase from the report that proves it"
+    )]
+    #[expect(
+        clippy::let_underscore_must_use,
+        reason = "TaskSupervisor::launch_shutdown; a watch send fails only when every observer is gone and the cancel flag is idempotent; handled results would only restate that nobody is left to inform"
+    )]
     fn launch_shutdown(&self, grace: Duration, finalizer: Option<Finalizer>) -> Completion {
         let mut st = self.inner.state.lock().unwrap();
         if let Some(rx) = &st.completion {
@@ -84,6 +104,10 @@ impl TaskSupervisor {
 
     /// Observe an owner-started shutdown without racing it to install a driver
     /// lacking the owner's resource finalizer.
+    #[expect(
+        clippy::unwrap_used,
+        reason = "TaskSupervisor::observe_shutdown; a poisoned supervisor state may hold a half-recorded phase, task map or report; recovering it could report a shutdown that never completed or hide one that failed"
+    )]
     pub(crate) async fn observe_shutdown(&self) -> ShutdownReport {
         let mut rx = loop {
             let notified = self.inner.workers_done.notified();
@@ -145,6 +169,10 @@ impl TaskSupervisor {
     }
 }
 /// The one shutdown sequence, owned by the driver task.
+#[expect(
+    clippy::let_underscore_must_use,
+    reason = "drive_shutdown; the cancel flag is a watch whose send fails only when every worker is gone; a handled result would only restate that there is nobody left to cancel"
+)]
 async fn drive_shutdown(
     inner: &Arc<Inner>,
     tasks: BTreeMap<TaskId, Supervised>,
diff --git a/src/telemetry_batch.rs b/src/telemetry_batch.rs
index 0b26a225..94727da8 100644
--- a/src/telemetry_batch.rs
+++ b/src/telemetry_batch.rs
@@ -47,13 +47,13 @@ pub(crate) fn encode_prefix<'a, T: Serialize + 'a>(
             overflow: false,
         };
         if let Err(error) = serde_json::to_writer(&mut row, event) {
-            if row.overflow {
-                if count == 0 {
-                    return Ok(Selection::Oversized);
-                }
-                break;
+            if !row.overflow {
+                return Err(error.to_string());
             }
-            return Err(error.to_string());
+            if count == 0 {
+                return Ok(Selection::Oversized);
+            }
+            break;
         }
         let with_array_end = body
             .len()
diff --git a/src/tenant.rs b/src/tenant.rs
index c715a23c..413c4d11 100644
--- a/src/tenant.rs
+++ b/src/tenant.rs
@@ -159,6 +159,10 @@ impl ProjectId {
     /// the verified principal's project selects the tenant-qualified
     /// storage identity; the deployment tenant no longer addresses
     /// customer data on principal-carrying paths.
+    #[expect(
+        clippy::expect_used,
+        reason = "ProjectId::stream_ref; callers pass names they already validated as canonical; a fallible lookup would add a branch no caller reaches"
+    )]
     pub(crate) fn stream_ref(&self, canonical_name: &str) -> TenantStreamRef {
         TenantStreamRef::new(
             self.clone(),
@@ -179,6 +183,10 @@ pub(crate) const SYSTEM_PROJECT: &str = "system";
 /// ONLY way internal code should address system streams — customer
 /// paths can never construct it through a verified principal (auth
 /// refuses the claim) or the deployment tenant (startup refuses it).
+#[expect(
+    clippy::expect_used,
+    reason = "system_project; the reserved system id is a constant that satisfies the project grammar; a fallible constructor would add a branch no caller reaches"
+)]
 pub(crate) fn system_project() -> ProjectId {
     ProjectId::new(SYSTEM_PROJECT).expect("the reserved id satisfies the grammar")
 }
@@ -395,7 +403,7 @@ impl HashDomain {
 /// Length-prefixed component append (§2.1, verbatim from the
 /// contract). Never concatenate identities with delimiters.
 pub(crate) fn append_component(out: &mut Vec<u8>, value: &[u8]) {
-    out.extend_from_slice(&(value.len() as u32).to_be_bytes());
+    out.extend_from_slice(&u32::try_from(value.len()).unwrap_or(u32::MAX).to_be_bytes());
     out.extend_from_slice(value);
 }
 
@@ -781,284 +789,5 @@ impl StreamGrant {
 // ---------------------------------------------------------------------------
 
 #[cfg(test)]
-mod tests {
-    use super::*;
-
-    fn pid(s: &str) -> ProjectId {
-        ProjectId::new(s).unwrap()
-    }
-
-    fn sref(p: &str, n: &str) -> TenantStreamRef {
-        TenantStreamRef::new(pid(p), CanonicalStreamName::new(n).unwrap())
-    }
-
-    #[test]
-    fn id_bounds_are_enforced() {
-        assert_eq!(ProjectId::new(""), Err(IdentityError::Empty));
-        assert!(ProjectId::new(&"x".repeat(128)).is_ok());
-        assert_eq!(
-            ProjectId::new(&"x".repeat(129)),
-            Err(IdentityError::TooLong { max: 128, got: 129 })
-        );
-        assert_eq!(
-            ProjectId::new("a b"),
-            Err(IdentityError::ForbiddenByte { at: 1 })
-        );
-        assert_eq!(
-            ProjectId::new("a\tb"),
-            Err(IdentityError::ForbiddenByte { at: 1 })
-        );
-        // Allowlist, not denylist: zero-width space, bidi override,
-        // dot, slash, and '+' are all outside [A-Za-z0-9_-].
-        for bad in ["a\u{200b}b", "a\u{202e}b", "a.b", "a/b", "a+b"] {
-            assert_eq!(
-                ProjectId::new(bad),
-                Err(IdentityError::ForbiddenByte { at: 1 }),
-                "{bad:?} must be rejected"
-            );
-        }
-        assert!(ProjectId::new("proj_ABC-123").is_ok());
-        assert!(WorkspaceId::new("ws_789").is_ok());
-        assert!(validate_cell_id("fra-cell-07").is_ok());
-    }
-
-    #[test]
-    fn encoding_is_length_prefixed_and_exact() {
-        let mut out = Vec::new();
-        append_component(&mut out, b"ab");
-        assert_eq!(out, vec![0, 0, 0, 2, b'a', b'b']);
-        let enc = encode_hash_input(HashDomain::RouteV1, &[b"p", b"n"]);
-        let mut want = Vec::new();
-        append_component(&mut want, b"route-v1");
-        append_component(&mut want, b"p");
-        append_component(&mut want, b"n");
-        assert_eq!(enc, want);
-    }
-
-    #[test]
-    fn encoding_cannot_alias_component_boundaries() {
-        // ("ab","c") vs ("a","bc") — the delimiter-concatenation bug
-        // the contract forbids.
-        let x = encode_hash_input(HashDomain::RouteV1, &[b"ab", b"c"]);
-        let y = encode_hash_input(HashDomain::RouteV1, &[b"a", b"bc"]);
-        assert_ne!(x, y);
-    }
-
-    #[test]
-    fn domains_are_separated() {
-        let r = encode_hash_input(HashDomain::RouteV1, &[b"p", b"n"]);
-        let s = encode_hash_input(HashDomain::StorageV1, &[b"p", b"n"]);
-        assert_ne!(r, s);
-    }
-
-    #[test]
-    fn same_name_in_two_projects_yields_different_identity_inputs() {
-        let a = sref("proj_a", "orders");
-        let b = sref("proj_b", "orders");
-        assert_ne!(route_hash_input(&a), route_hash_input(&b));
-        assert_ne!(storage_hash_input(&a, "e1"), storage_hash_input(&b, "e1"));
-        assert_ne!(
-            segment_identity_input(&a, "e1", 0),
-            segment_identity_input(&b, "e1", 0)
-        );
-        // Same project, same name: identical (the reference identity).
-        let a2 = sref("proj_a", "orders");
-        assert_eq!(route_hash_input(&a), route_hash_input(&a2));
-    }
-
-    #[test]
-    fn segment_id_is_a_fixed_width_component() {
-        // Adjacent segment ids must not alias epoch bytes.
-        let r = sref("p", "n");
-        assert_ne!(
-            segment_identity_input(&r, "e", 1),
-            segment_identity_input(&r, "e", 256)
-        );
-    }
-
-    #[test]
-    fn child_route_is_its_own_domain() {
-        let r = sref("proj_a", "orders");
-        let child = route_child_hash_input(&r, 3, b"salt1");
-        assert_ne!(child, route_hash_input(&r));
-        assert_ne!(child, route_child_hash_input(&r, 4, b"salt1"));
-        assert_ne!(child, route_child_hash_input(&r, 3, b"salt2"));
-        let other = sref("proj_b", "orders");
-        assert_ne!(child, route_child_hash_input(&other, 3, b"salt1"));
-    }
-
-    #[test]
-    fn scope_parsing_matches_the_contract() {
-        let (set, unknown) =
-            ScopeSet::parse("streams.records.read streams.records.append streams.metadata.read");
-        assert_eq!(unknown, 0);
-        assert!(set.has(Scope::RecordsRead));
-        assert!(set.has(Scope::RecordsAppend));
-        assert!(set.has(Scope::MetadataRead));
-        assert!(!set.has(Scope::LifecycleManage));
-        assert_eq!(set.iter().count(), 3);
-        // Unknown scopes are counted, never granted.
-        let (set2, unknown2) = ScopeSet::parse("streams.future.thing streams.create");
-        assert_eq!(unknown2, 1);
-        assert!(set2.has(Scope::Create));
-        assert_eq!(set2.iter().count(), 1);
-        // Every scope round-trips through its canonical string.
-        for s in Scope::ALL {
-            assert_eq!(Scope::parse(s.as_str()), Some(s));
-        }
-    }
-
-    #[test]
-    fn prefix_matching_is_component_aware() {
-        // The contract's example, verbatim (§6.2).
-        let g = CanonicalPrefix::normalize("customers/acme").unwrap();
-        assert!(g.matches("customers/acme"));
-        assert!(g.matches("customers/acme/orders"));
-        assert!(!g.matches("customers/acme-other"));
-        // Escape attempts.
-        assert!(!g.matches("customers"));
-        assert!(!g.matches("customers/ac"));
-        assert!(!g.matches("customers/acmeX"));
-        assert!(!g.matches("xcustomers/acme"));
-    }
-
-    #[test]
-    fn prefix_normalization_rejects_non_canonical_forms() {
-        assert_eq!(CanonicalPrefix::normalize(""), Err(PrefixError::Empty));
-        assert_eq!(
-            CanonicalPrefix::normalize("/a"),
-            Err(PrefixError::EmptyComponent)
-        );
-        assert_eq!(
-            CanonicalPrefix::normalize("a/"),
-            Err(PrefixError::EmptyComponent)
-        );
-        assert_eq!(
-            CanonicalPrefix::normalize("a//b"),
-            Err(PrefixError::EmptyComponent)
-        );
-        assert_eq!(
-            CanonicalPrefix::normalize("a b"),
-            Err(PrefixError::ForbiddenChar { at: 1 })
-        );
-        assert!(CanonicalPrefix::normalize(&"x".repeat(257)).is_err());
-        // Shared component rules with stream names (review round):
-        assert_eq!(
-            CanonicalPrefix::normalize("."),
-            Err(PrefixError::DotComponent)
-        );
-        assert_eq!(
-            CanonicalPrefix::normalize(".."),
-            Err(PrefixError::DotComponent)
-        );
-        assert_eq!(
-            CanonicalPrefix::normalize("a/../b"),
-            Err(PrefixError::DotComponent)
-        );
-        assert_eq!(
-            CanonicalPrefix::normalize("__ds"),
-            Err(PrefixError::ReservedRoot)
-        );
-        assert_eq!(
-            CanonicalPrefix::normalize("__ds/x"),
-            Err(PrefixError::ReservedRoot)
-        );
-        // Only the ROOT is reserved, and addressability finals are
-        // deliberately legal in prefixes:
-        assert!(CanonicalPrefix::normalize("a/__ds").is_ok());
-        assert!(CanonicalPrefix::normalize("a/records").is_ok());
-    }
-
-    #[test]
-    fn prefix_set_drops_redundant_grants() {
-        let set =
-            normalize_prefix_set(&["customers/acme/orders", "customers/acme", "other"]).unwrap();
-        let strs: Vec<&str> = set.iter().map(|p| p.as_str()).collect();
-        assert_eq!(strs, vec!["other", "customers/acme"]);
-        // Duplicates collapse too.
-        let set2 = normalize_prefix_set(&["a", "a"]).unwrap();
-        assert_eq!(set2.len(), 1);
-        // Non-covering near-misses are kept: 'a-b' is not under 'a'.
-        let set3 = normalize_prefix_set(&["a", "a-b"]).unwrap();
-        assert_eq!(set3.len(), 2);
-        assert!(prefix_set_matches(&set3, "a-b/x"));
-        assert!(!prefix_set_matches(&set3, "a-c"));
-    }
-
-    #[test]
-    fn canonical_stream_name_is_checked_construction() {
-        assert!(CanonicalStreamName::new("orders").is_ok());
-        assert!(CanonicalStreamName::new("customers/acme/orders").is_ok());
-        assert_eq!(CanonicalStreamName::new(""), Err(NameError::Empty));
-        assert_eq!(
-            CanonicalStreamName::new("a//b"),
-            Err(NameError::EmptyComponent)
-        );
-        assert_eq!(
-            CanonicalStreamName::new("/a"),
-            Err(NameError::EmptyComponent)
-        );
-        assert_eq!(
-            CanonicalStreamName::new("a/"),
-            Err(NameError::EmptyComponent)
-        );
-        assert_eq!(
-            CanonicalStreamName::new("a/./b"),
-            Err(NameError::DotComponent)
-        );
-        assert_eq!(
-            CanonicalStreamName::new("a/../b"),
-            Err(NameError::DotComponent)
-        );
-        assert_eq!(
-            CanonicalStreamName::new("__ds/x"),
-            Err(NameError::ReservedRoot)
-        );
-        assert_eq!(
-            CanonicalStreamName::new("__ds"),
-            Err(NameError::ReservedRoot)
-        );
-        // __ds below the root is a legal component (only the ROOT is reserved).
-        assert!(CanonicalStreamName::new("a/__ds").is_ok());
-    }
-
-    /// PR 4.1: the canonical layer OWNS error precedence. Structural
-    /// component problems win over the reserved root (the product
-    /// surface's historical wire order); a well-formed reserved name
-    /// still reports the root.
-    #[test]
-    fn name_error_precedence() {
-        assert_eq!(
-            CanonicalStreamName::new("__ds/..").unwrap_err(),
-            NameError::DotComponent
-        );
-        assert_eq!(
-            CanonicalStreamName::new("__ds//x").unwrap_err(),
-            NameError::EmptyComponent
-        );
-        assert_eq!(
-            CanonicalStreamName::new("__ds/x").unwrap_err(),
-            NameError::ReservedRoot
-        );
-        assert_eq!(
-            CanonicalStreamName::new("__ds").unwrap_err(),
-            NameError::ReservedRoot
-        );
-        assert_eq!(
-            CanonicalStreamName::new("a\u{7}b"),
-            Err(NameError::ControlChar { at: 1 })
-        );
-        assert!(CanonicalStreamName::new(&"x".repeat(513)).is_err());
-        assert!(CanonicalStreamName::new(&"x".repeat(512)).is_ok());
-    }
-
-    #[test]
-    fn prefix_count_limit_is_enforced() {
-        let raws: Vec<String> = (0..65).map(|i| format!("p{i}")).collect();
-        let refs: Vec<&str> = raws.iter().map(String::as_str).collect();
-        assert_eq!(
-            normalize_prefix_set(&refs),
-            Err(PrefixError::TooMany { max: 64, got: 65 })
-        );
-    }
-}
+#[path = "tenant/tests.rs"]
+mod tests;
diff --git a/src/tenant/tests.rs b/src/tenant/tests.rs
new file mode 100644
index 00000000..de4c0464
--- /dev/null
+++ b/src/tenant/tests.rs
@@ -0,0 +1,280 @@
+//! The tenant identity grammar's unit tests.
+#![cfg(test)]
+use super::*;
+
+fn pid(s: &str) -> ProjectId {
+    ProjectId::new(s).unwrap()
+}
+
+fn sref(p: &str, n: &str) -> TenantStreamRef {
+    TenantStreamRef::new(pid(p), CanonicalStreamName::new(n).unwrap())
+}
+
+#[test]
+fn id_bounds_are_enforced() {
+    assert_eq!(ProjectId::new(""), Err(IdentityError::Empty));
+    assert!(ProjectId::new(&"x".repeat(128)).is_ok());
+    assert_eq!(
+        ProjectId::new(&"x".repeat(129)),
+        Err(IdentityError::TooLong { max: 128, got: 129 })
+    );
+    assert_eq!(
+        ProjectId::new("a b"),
+        Err(IdentityError::ForbiddenByte { at: 1 })
+    );
+    assert_eq!(
+        ProjectId::new("a\tb"),
+        Err(IdentityError::ForbiddenByte { at: 1 })
+    );
+    // Allowlist, not denylist: zero-width space, bidi override,
+    // dot, slash, and '+' are all outside [A-Za-z0-9_-].
+    for bad in ["a\u{200b}b", "a\u{202e}b", "a.b", "a/b", "a+b"] {
+        assert_eq!(
+            ProjectId::new(bad),
+            Err(IdentityError::ForbiddenByte { at: 1 }),
+            "{bad:?} must be rejected"
+        );
+    }
+    assert!(ProjectId::new("proj_ABC-123").is_ok());
+    assert!(WorkspaceId::new("ws_789").is_ok());
+    assert!(validate_cell_id("fra-cell-07").is_ok());
+}
+
+#[test]
+fn encoding_is_length_prefixed_and_exact() {
+    let mut out = Vec::new();
+    append_component(&mut out, b"ab");
+    assert_eq!(out, vec![0, 0, 0, 2, b'a', b'b']);
+    let enc = encode_hash_input(HashDomain::RouteV1, &[b"p", b"n"]);
+    let mut want = Vec::new();
+    append_component(&mut want, b"route-v1");
+    append_component(&mut want, b"p");
+    append_component(&mut want, b"n");
+    assert_eq!(enc, want);
+}
+
+#[test]
+fn encoding_cannot_alias_component_boundaries() {
+    // ("ab","c") vs ("a","bc") — the delimiter-concatenation bug
+    // the contract forbids.
+    let x = encode_hash_input(HashDomain::RouteV1, &[b"ab", b"c"]);
+    let y = encode_hash_input(HashDomain::RouteV1, &[b"a", b"bc"]);
+    assert_ne!(x, y);
+}
+
+#[test]
+fn domains_are_separated() {
+    let r = encode_hash_input(HashDomain::RouteV1, &[b"p", b"n"]);
+    let s = encode_hash_input(HashDomain::StorageV1, &[b"p", b"n"]);
+    assert_ne!(r, s);
+}
+
+#[test]
+fn same_name_in_two_projects_yields_different_identity_inputs() {
+    let a = sref("proj_a", "orders");
+    let b = sref("proj_b", "orders");
+    assert_ne!(route_hash_input(&a), route_hash_input(&b));
+    assert_ne!(storage_hash_input(&a, "e1"), storage_hash_input(&b, "e1"));
+    assert_ne!(
+        segment_identity_input(&a, "e1", 0),
+        segment_identity_input(&b, "e1", 0)
+    );
+    // Same project, same name: identical (the reference identity).
+    let a2 = sref("proj_a", "orders");
+    assert_eq!(route_hash_input(&a), route_hash_input(&a2));
+}
+
+#[test]
+fn segment_id_is_a_fixed_width_component() {
+    // Adjacent segment ids must not alias epoch bytes.
+    let r = sref("p", "n");
+    assert_ne!(
+        segment_identity_input(&r, "e", 1),
+        segment_identity_input(&r, "e", 256)
+    );
+}
+
+#[test]
+fn child_route_is_its_own_domain() {
+    let r = sref("proj_a", "orders");
+    let child = route_child_hash_input(&r, 3, b"salt1");
+    assert_ne!(child, route_hash_input(&r));
+    assert_ne!(child, route_child_hash_input(&r, 4, b"salt1"));
+    assert_ne!(child, route_child_hash_input(&r, 3, b"salt2"));
+    let other = sref("proj_b", "orders");
+    assert_ne!(child, route_child_hash_input(&other, 3, b"salt1"));
+}
+
+#[test]
+fn scope_parsing_matches_the_contract() {
+    let (set, unknown) =
+        ScopeSet::parse("streams.records.read streams.records.append streams.metadata.read");
+    assert_eq!(unknown, 0);
+    assert!(set.has(Scope::RecordsRead));
+    assert!(set.has(Scope::RecordsAppend));
+    assert!(set.has(Scope::MetadataRead));
+    assert!(!set.has(Scope::LifecycleManage));
+    assert_eq!(set.iter().count(), 3);
+    // Unknown scopes are counted, never granted.
+    let (set2, unknown2) = ScopeSet::parse("streams.future.thing streams.create");
+    assert_eq!(unknown2, 1);
+    assert!(set2.has(Scope::Create));
+    assert_eq!(set2.iter().count(), 1);
+    // Every scope round-trips through its canonical string.
+    for s in Scope::ALL {
+        assert_eq!(Scope::parse(s.as_str()), Some(s));
+    }
+}
+
+#[test]
+fn prefix_matching_is_component_aware() {
+    // The contract's example, verbatim (§6.2).
+    let g = CanonicalPrefix::normalize("customers/acme").unwrap();
+    assert!(g.matches("customers/acme"));
+    assert!(g.matches("customers/acme/orders"));
+    assert!(!g.matches("customers/acme-other"));
+    // Escape attempts.
+    assert!(!g.matches("customers"));
+    assert!(!g.matches("customers/ac"));
+    assert!(!g.matches("customers/acmeX"));
+    assert!(!g.matches("xcustomers/acme"));
+}
+
+#[test]
+fn prefix_normalization_rejects_non_canonical_forms() {
+    assert_eq!(CanonicalPrefix::normalize(""), Err(PrefixError::Empty));
+    assert_eq!(
+        CanonicalPrefix::normalize("/a"),
+        Err(PrefixError::EmptyComponent)
+    );
+    assert_eq!(
+        CanonicalPrefix::normalize("a/"),
+        Err(PrefixError::EmptyComponent)
+    );
+    assert_eq!(
+        CanonicalPrefix::normalize("a//b"),
+        Err(PrefixError::EmptyComponent)
+    );
+    assert_eq!(
+        CanonicalPrefix::normalize("a b"),
+        Err(PrefixError::ForbiddenChar { at: 1 })
+    );
+    assert!(CanonicalPrefix::normalize(&"x".repeat(257)).is_err());
+    // Shared component rules with stream names (review round):
+    assert_eq!(
+        CanonicalPrefix::normalize("."),
+        Err(PrefixError::DotComponent)
+    );
+    assert_eq!(
+        CanonicalPrefix::normalize(".."),
+        Err(PrefixError::DotComponent)
+    );
+    assert_eq!(
+        CanonicalPrefix::normalize("a/../b"),
+        Err(PrefixError::DotComponent)
+    );
+    assert_eq!(
+        CanonicalPrefix::normalize("__ds"),
+        Err(PrefixError::ReservedRoot)
+    );
+    assert_eq!(
+        CanonicalPrefix::normalize("__ds/x"),
+        Err(PrefixError::ReservedRoot)
+    );
+    // Only the ROOT is reserved, and addressability finals are
+    // deliberately legal in prefixes:
+    assert!(CanonicalPrefix::normalize("a/__ds").is_ok());
+    assert!(CanonicalPrefix::normalize("a/records").is_ok());
+}
+
+#[test]
+fn prefix_set_drops_redundant_grants() {
+    let set = normalize_prefix_set(&["customers/acme/orders", "customers/acme", "other"]).unwrap();
+    let strs: Vec<&str> = set.iter().map(|p| p.as_str()).collect();
+    assert_eq!(strs, vec!["other", "customers/acme"]);
+    // Duplicates collapse too.
+    let set2 = normalize_prefix_set(&["a", "a"]).unwrap();
+    assert_eq!(set2.len(), 1);
+    // Non-covering near-misses are kept: 'a-b' is not under 'a'.
+    let set3 = normalize_prefix_set(&["a", "a-b"]).unwrap();
+    assert_eq!(set3.len(), 2);
+    assert!(prefix_set_matches(&set3, "a-b/x"));
+    assert!(!prefix_set_matches(&set3, "a-c"));
+}
+
+#[test]
+fn canonical_stream_name_is_checked_construction() {
+    assert!(CanonicalStreamName::new("orders").is_ok());
+    assert!(CanonicalStreamName::new("customers/acme/orders").is_ok());
+    assert_eq!(CanonicalStreamName::new(""), Err(NameError::Empty));
+    assert_eq!(
+        CanonicalStreamName::new("a//b"),
+        Err(NameError::EmptyComponent)
+    );
+    assert_eq!(
+        CanonicalStreamName::new("/a"),
+        Err(NameError::EmptyComponent)
+    );
+    assert_eq!(
+        CanonicalStreamName::new("a/"),
+        Err(NameError::EmptyComponent)
+    );
+    assert_eq!(
+        CanonicalStreamName::new("a/./b"),
+        Err(NameError::DotComponent)
+    );
+    assert_eq!(
+        CanonicalStreamName::new("a/../b"),
+        Err(NameError::DotComponent)
+    );
+    assert_eq!(
+        CanonicalStreamName::new("__ds/x"),
+        Err(NameError::ReservedRoot)
+    );
+    assert_eq!(
+        CanonicalStreamName::new("__ds"),
+        Err(NameError::ReservedRoot)
+    );
+    // __ds below the root is a legal component (only the ROOT is reserved).
+    assert!(CanonicalStreamName::new("a/__ds").is_ok());
+}
+
+/// PR 4.1: the canonical layer OWNS error precedence. Structural
+/// component problems win over the reserved root (the product
+/// surface's historical wire order); a well-formed reserved name
+/// still reports the root.
+#[test]
+fn name_error_precedence() {
+    assert_eq!(
+        CanonicalStreamName::new("__ds/..").unwrap_err(),
+        NameError::DotComponent
+    );
+    assert_eq!(
+        CanonicalStreamName::new("__ds//x").unwrap_err(),
+        NameError::EmptyComponent
+    );
+    assert_eq!(
+        CanonicalStreamName::new("__ds/x").unwrap_err(),
+        NameError::ReservedRoot
+    );
+    assert_eq!(
+        CanonicalStreamName::new("__ds").unwrap_err(),
+        NameError::ReservedRoot
+    );
+    assert_eq!(
+        CanonicalStreamName::new("a\u{7}b"),
+        Err(NameError::ControlChar { at: 1 })
+    );
+    assert!(CanonicalStreamName::new(&"x".repeat(513)).is_err());
+    assert!(CanonicalStreamName::new(&"x".repeat(512)).is_ok());
+}
+
+#[test]
+fn prefix_count_limit_is_enforced() {
+    let raws: Vec<String> = (0..65).map(|i| format!("p{i}")).collect();
+    let refs: Vec<&str> = raws.iter().map(String::as_str).collect();
+    assert_eq!(
+        normalize_prefix_set(&refs),
+        Err(PrefixError::TooMany { max: 64, got: 65 })
+    );
+}
diff --git a/src/touch.rs b/src/touch.rs
index d352c910..1cda5b29 100644
--- a/src/touch.rs
+++ b/src/touch.rs
@@ -74,6 +74,14 @@ pub(crate) enum WaitOutcome {
 }
 
 impl TouchJournal {
+    #[expect(
+        clippy::disallowed_methods,
+        reason = "TouchJournal::start; the per-stream flusher is started under the journal map lock, where no supervisor is reachable, and it exits on its own once the journal closes; a supervised flusher would thread the supervisor through every journal creation for a task that ends itself"
+    )]
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "TouchJournal::start; the flusher nests the close verdict inside the tick loop of the spawned flusher; flattening it would separate the verdict from the tick that produced it"
+    )]
     pub(crate) fn start(entropy: &dyn crate::runtime::Entropy) -> Arc<TouchJournal> {
         let mut e = [0u8; 8];
         entropy.fill(&mut e);
@@ -102,6 +110,10 @@ impl TouchJournal {
     }
 
     /// Record touched key IDs (shard acker, post-durability).
+    #[expect(
+        clippy::unwrap_used,
+        reason = "TouchJournal::ingest; a poisoned journal may hold a half-ingested bucket; recovering it could flush or acknowledge touches that were never recorded"
+    )]
     pub(crate) fn ingest(&self, key_ids: &[u32], next_offset: u64) {
         let mut inner = self.inner.lock().unwrap();
         if inner.closed {
@@ -123,6 +135,10 @@ impl TouchJournal {
         }
     }
 
+    #[expect(
+        clippy::unwrap_used,
+        reason = "TouchJournal::flush_bucket; a poisoned journal may hold a half-ingested bucket; recovering it could flush or acknowledge touches that were never recorded"
+    )]
     fn flush_bucket(&self, reap: bool) -> bool {
         let mut inner = self.inner.lock().unwrap();
         if inner.closed {
@@ -372,6 +388,10 @@ impl TouchRegistry {
         }
     }
 
+    #[expect(
+        clippy::unwrap_used,
+        reason = "TouchRegistry::journal; a poisoned journal map may hold a half-inserted or half-closed journal; recovering it could revive a journal a fence already closed"
+    )]
     pub(crate) fn journal(
         &self,
         hash: [u8; 16],
@@ -387,6 +407,10 @@ impl TouchRegistry {
     /// Fence/move of a shard: close + drop every journal whose stream's
     /// shard ROUTE hash falls in the shard's bit-prefix, waking all
     /// their waiters with stale.
+    #[expect(
+        clippy::unwrap_used,
+        reason = "TouchRegistry::close_shard; a poisoned journal map may hold a half-inserted or half-closed journal; recovering it could revive a journal a fence already closed"
+    )]
     pub(crate) fn close_shard(&self, prefix: &str) {
         let mut map = self.map.lock().unwrap();
         let closing: Vec<[u8; 16]> = map