diff --git a/docs/quality/diagnostic-allowances-linux.json b/docs/quality/diagnostic-allowances-linux.json
index 102b3e6f..3e621662 100644
--- a/docs/quality/diagnostic-allowances-linux.json
+++ b/docs/quality/diagnostic-allowances-linux.json
@@ -1,62 +1,6 @@
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@@ -183,27 +106,6 @@
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@@ -323,13 +190,6 @@
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@@ -365,20 +218,6 @@
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@@ -526,13 +337,6 @@
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@@ -687,13 +491,6 @@
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@@ -708,13 +505,6 @@
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-      "path": "src/touch.rs"
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-      "item": "crate::TouchRegistry::close_shard",
-      "lint": "clippy::unwrap_used",
-      "path": "src/touch.rs"
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-      "fingerprint": "79bf708a68180b65b78fb4b5de7c69048961f330cf30f057b3f782cac8932941",
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-      "lint": "clippy::unwrap_used",
-      "path": "src/touch.rs"
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-      "item": "crate::LiveFeed::read_and_publish",
-      "lint": "clippy::wildcard_enum_match_arm",
-      "path": "src/sse/feed.rs"
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@@ -4830,13 +2881,6 @@
       "lint": "unreachable_pub",
       "path": "src/application/read_keys.rs"
     },
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-      "item": "crate::spawn_refresher",
-      "lint": "unreachable_pub",
-      "path": "src/auth_feed.rs"
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@@ -4844,20 +2888,6 @@
       "lint": "unreachable_pub",
       "path": "src/bootstrap.rs"
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-      "item": "crate::TraceStore::with_options",
-      "lint": "unreachable_pub",
-      "path": "src/dst/trace_store.rs"
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-      "item": "crate::Fp::site",
-      "lint": "unreachable_pub",
-      "path": "src/failpoints.rs"
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@@ -4907,13 +2937,6 @@
       "lint": "unreachable_pub",
       "path": "src/product.rs"
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-      "item": "crate::QuotaRegistry::admit_append",
-      "lint": "unreachable_pub",
-      "path": "src/quota.rs"
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@@ -4942,13 +2965,6 @@
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       "path": "src/registry.rs"
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-      "item": "crate::RuntimeCaps::with",
-      "lint": "unreachable_pub",
-      "path": "src/runtime.rs"
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diff --git a/docs/quality/diagnostic-allowances.json b/docs/quality/diagnostic-allowances.json
index ffa6609a..8351c530 100644
--- a/docs/quality/diagnostic-allowances.json
+++ b/docs/quality/diagnostic-allowances.json
@@ -1,62 +1,6 @@
 {
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-      "lint": "clippy::allow_attributes_without_reason",
-      "path": "src/dst/tests/runtime_sweep.rs"
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-      "item": "crate::TraceState::event",
-      "lint": "clippy::allow_attributes_without_reason",
-      "path": "src/dst/trace_store.rs"
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@@ -78,13 +22,6 @@
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@@ -106,20 +43,6 @@
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-      "lint": "clippy::allow_attributes_without_reason",
-      "path": "src/sse/source.rs"
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-      "item": "crate::LineageSpan::identity",
-      "lint": "clippy::allow_attributes_without_reason",
-      "path": "src/sse/source.rs"
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@@ -183,27 +106,6 @@
       "lint": "clippy::arithmetic_side_effects",
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-      "path": "src/application/creation/fork.rs"
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-      "item": "crate::o2_tests::o2_batch_publishes_one_owner_only_after_authentication_and_admission",
-      "lint": "clippy::cast_possible_truncation",
-      "path": "src/application/read.rs"
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@@ -246,41 +148,6 @@
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-      "lint": "clippy::cast_possible_truncation",
-      "path": "src/dst/tests/consumer_generations.rs"
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-      "lint": "clippy::cast_possible_truncation",
-      "path": "src/dst/tests/fixture_storage.rs"
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@@ -330,13 +197,6 @@
       "lint": "clippy::cast_possible_truncation",
       "path": "src/fleet/repository.rs"
     },
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-      "item": "crate::raw_page",
-      "lint": "clippy::cast_possible_truncation",
-      "path": "src/history/postings_validation_tests.rs"
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@@ -344,13 +204,6 @@
       "lint": "clippy::cast_possible_truncation",
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-      "item": "crate::decode_char",
-      "lint": "clippy::cast_possible_truncation",
-      "path": "src/offsets.rs"
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@@ -372,20 +225,6 @@
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       "path": "src/product.rs"
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-      "item": "crate::CatalogCursor::encode",
-      "lint": "clippy::cast_possible_truncation",
-      "path": "src/product_cursor.rs"
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-      "fingerprint": "854ed2b01aff96913794d23e8c6a480c2b3b900d70b52d6ce400051af02158f7",
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-      "lint": "clippy::cast_possible_truncation",
-      "path": "src/product_cursor.rs"
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@@ -393,34 +232,6 @@
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-      "item": "crate::<SystemClock as Clock>::now",
-      "lint": "clippy::cast_possible_truncation",
-      "path": "src/runtime.rs"
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-      "fingerprint": "043c5b1b0ed2607c4361ee53907fda91073cc4aae91b714732a9191d7ca520c8",
-      "item": "crate::ManualClock::advance",
-      "lint": "clippy::cast_possible_truncation",
-      "path": "src/runtime.rs"
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-      "fingerprint": "c4bc68ccc02a08088a6b3aa54ec76539b649f03f03a2be166e28b999dcc96351",
-      "item": "crate::MonotonicNow::millis",
-      "lint": "clippy::cast_possible_truncation",
-      "path": "src/runtime.rs"
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-      "fingerprint": "7801c4f0eb99e050a6ee03c0ba53d2e916006cd4b99c8f409cf9624daf0dcf85",
-      "item": "crate::tests::segment_order_cannot_erase_a_hot_key_or_change_decisions",
-      "lint": "clippy::cast_possible_truncation",
-      "path": "src/scaler3.rs"
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@@ -533,13 +344,6 @@
       "lint": "clippy::cast_possible_truncation",
       "path": "src/shard/transaction/publish.rs"
     },
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-      "item": "crate::LiveFeed::read_and_publish",
-      "lint": "clippy::cast_possible_truncation",
-      "path": "src/sse/feed.rs"
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@@ -2563,167 +1744,6 @@
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-      "path": "src/sse/source.rs"
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-      "item": "crate::livefeed_remote_sealed_predecessor_streams_through_owner",
-      "lint": "clippy::unnecessary_to_owned",
-      "path": "src/dst/tests/livefeed_history.rs"
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@@ -4235,13 +2594,6 @@
       "lint": "clippy::unnecessary_wraps",
       "path": "src/registry.rs"
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@@ -4256,41 +2608,6 @@
       "lint": "clippy::unwrap_used",
       "path": "src/application/append/contract.rs"
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-      "path": "src/application/consumer.rs"
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-      "item": "crate::validate_boundary",
-      "lint": "clippy::unwrap_used",
-      "path": "src/application/creation/fork.rs"
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-      "fingerprint": "34a919c9b9e5cf280c9bf56bd2747b29062a42d307d5809f4cd67691660b3b6b",
-      "item": "crate::seed",
-      "lint": "clippy::unwrap_used",
-      "path": "src/application/creation/initialization.rs"
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-      "fingerprint": "64ffd9e77598203d0f3ca8a1fff6754fe9c94d177853345b9d1a9f76c754ffbe",
-      "item": "crate::execute_segment",
-      "lint": "clippy::unwrap_used",
-      "path": "src/application/read.rs"
-    },
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-      "fingerprint": "67efc16f663ea2fb945a6db2e5f6759e664f104e222bf9fdecc630b8fcbadb51",
-      "item": "crate::read_stitched",
-      "lint": "clippy::unwrap_used",
-      "path": "src/application/read.rs"
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     {
       "count": 1,
       "fingerprint": "f2214df93dd43613446ec659a2de14e255cf22a69cb8c3a7f2a067986c2b570f",
@@ -4298,41 +2615,6 @@
       "lint": "clippy::unwrap_used",
       "path": "src/application/read_scan.rs"
     },
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-      "fingerprint": "6014b1aa6add876df5db2da816491f9050257ec26f0e50d0c4fe0687ad9ef730",
-      "item": "crate::<PendingAudit < '_ > as Drop>::drop",
-      "lint": "clippy::unwrap_used",
-      "path": "src/audit.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "9375a6112a76aabe637ef8b03563c63dd562d03156db08619f4980b6acad2452",
-      "item": "crate::PendingAudit < 'a >::take",
-      "lint": "clippy::unwrap_used",
-      "path": "src/audit.rs"
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-      "count": 1,
-      "fingerprint": "dc39e1a52100a6faeac2f8acd2d170bdae29f475b95273a40e6893ccc15330b9",
-      "item": "crate::observe_denial",
-      "lint": "clippy::unwrap_used",
-      "path": "src/audit.rs"
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-    {
-      "count": 1,
-      "fingerprint": "cc28b723168aad66f2e97760c083e4524a0958416041699da43b583b9249713a",
-      "item": "crate::latency",
-      "lint": "clippy::unwrap_used",
-      "path": "src/bin/verify.rs"
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-      "fingerprint": "fded73500a08aae4e9eeda1645dfc83b6064d6dd544c5c25b969b3d496d5a0e9",
-      "item": "crate::latency",
-      "lint": "clippy::unwrap_used",
-      "path": "src/bin/verify.rs"
-    },
     {
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       "fingerprint": "730010c152b1433ddceb819a81576c406ec6290c180b78d381ba4d18eaefd040",
@@ -4543,111 +2825,6 @@
       "lint": "clippy::unwrap_used",
       "path": "src/sse/auth.rs"
     },
-    {
-      "count": 1,
-      "fingerprint": "224dbd17a19657e27865790208cd9cb559545dc94a19ac7138821489cdd652bf",
-      "item": "crate::<LiveFeed as Drop>::drop",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/feed.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "7af84b290433c9c321e3fb9caafdf0f61ec32606ff688dc38883082770a82006",
-      "item": "crate::FeedMemoryBudget::project_retention",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/feed.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "c083fc4f20bb43a0bf34fdd84d92644f4b00f9be0e18865f45268a36766ef150",
-      "item": "crate::FeedMemoryBudget::project_rows",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/feed.rs"
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-      "fingerprint": "e7ca24743e1f927151be7a8f582b2cf17c59cfffc3aacbff35b01db1593abaf1",
-      "item": "crate::FeedMemoryBudget::release_project_entry",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/feed.rs"
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-      "fingerprint": "073ed02b4b296d54800c80ec2e7a50044b6e853e546c8824b0a4f59c8f3aaced",
-      "item": "crate::LiveFeed::drive_under_permit",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/feed.rs"
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-      "fingerprint": "211c0f90bdea61f666fa94fd779d4ba2b178f847b93a0982b97339bccd5d9b7c",
-      "item": "crate::LiveFeed::drive_under_permit",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/feed.rs"
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-      "item": "crate::LiveFeed::drive_under_permit",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/feed.rs"
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-      "fingerprint": "a2c3099a3f09147df8520f7cdc9cbee8336efb49ce62f327989f2502860f53ea",
-      "item": "crate::LiveFeed::head",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/feed.rs"
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-      "fingerprint": "4be1f85061c81c6fba5707e516527be5b21a2d6e2d48dea934ce11a805e45fd9",
-      "item": "crate::LiveFeed::install_source",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/feed.rs"
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-      "fingerprint": "a9f56cd4e236a5720891af68fde8eef9d702c4d3e66bdc773c612cb8ee67a8b2",
-      "item": "crate::LiveFeed::read_and_publish",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/feed.rs"
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-      "fingerprint": "cd62b775965adb7cdd60ce4fd89dcddd3bd61964696bd637dddb5d16916a8d67",
-      "item": "crate::LiveFeed::schedule_transition_retry",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/feed.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "03c7cc2d69e26a31e488c71ad50dd844768e0c921a688839316a9def7e876177",
-      "item": "crate::LiveFeed::source_snapshot",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/feed.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "9403877c739fb5b0a746e93895f0e151741c7d7f83c33d57b11edc28c41b84a1",
-      "item": "crate::LiveFeed::subscribe_locked",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/feed.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "a9a68411827f8c52fcc7692bd7106cd576329f913ece7c2e0dc9202eb61274f9",
-      "item": "crate::LiveFeed::subscribe_locked",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/feed.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "966df9d375be27e401ff65c781944b49e0cf09696f1ae6d9244b7291646e4e9d",
-      "item": "crate::LiveFeed::take_visible",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/feed.rs"
-    },
     {
       "count": 1,
       "fingerprint": "e01afb79860b940cd885f3130c9986c7e370d0d098817f2e4adb9800ee02551b",
@@ -4683,132 +2860,6 @@
       "lint": "clippy::unwrap_used",
       "path": "src/sse/session.rs"
     },
-    {
-      "count": 1,
-      "fingerprint": "47ef3e4da68eee0609dc78313dca45277aff6344fb5415e5aa7dcf852d7cf572",
-      "item": "crate::<LineageSource as super::feed::FeedSourceRead>::closed",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/source.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "66b053ee0a1218c502eba5a91ba71c05f3e0d8efc29f9a73535699eb9a129bd9",
-      "item": "crate::<LineageSource as super::feed::FeedSourceRead>::frontier",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/source.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "851787499c483eb04ad9fd9a49b09ffa937523543434852d787e9a03bc212cf8",
-      "item": "crate::<LineageSource as super::feed::FeedSourceRead>::logicalize",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/source.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "eb3e246f9b95db8fd7f2b83e258d5be5310102684ddb6c8909049482178b3c5e",
-      "item": "crate::<SingleSource as super::feed::FeedSourceRead>::closed",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/source.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "85caf6c3f03fb531de49847d93da29c43bbe8982e282b45dc34d219f1b8dc56e",
-      "item": "crate::<SingleSource as super::feed::FeedSourceRead>::frontier",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/source.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "5833d8b529955b15b505f11e1112892afe1ee59af9e4c7df4db845eee7491612",
-      "item": "crate::LineageSource::sealed_span_page",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/source.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "ef7842ad7257942dbc119cd852e63843df543085180e3d055e8172c3ae01257e",
-      "item": "crate::LineageSource::sealed_span_page",
-      "lint": "clippy::unwrap_used",
-      "path": "src/sse/source.rs"
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-    {
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-      "fingerprint": "20c3acc01822fdb78e771b898502ed53a4206d8bb8db2b34fc65d4d87163276d",
-      "item": "crate::TaskSupervisor::incomplete_shutdown_failure",
-      "lint": "clippy::unwrap_used",
-      "path": "src/tasks/shutdown.rs"
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-      "fingerprint": "30d712b2122b4fdd8fa362a2b13f07760ec21ed80f928b8815a3876baf9b970e",
-      "item": "crate::TaskSupervisor::launch_shutdown",
-      "lint": "clippy::unwrap_used",
-      "path": "src/tasks/shutdown.rs"
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-      "fingerprint": "60a71a130702a263dcad0e099f43d7e96f5776f921eb44db9d1dca33fc9f6a6b",
-      "item": "crate::TaskSupervisor::launch_shutdown",
-      "lint": "clippy::unwrap_used",
-      "path": "src/tasks/shutdown.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "b5bdd9f0c8a87be648b57157e2b40459ec06e20daa6719790c0abd11fd068ab0",
-      "item": "crate::TaskSupervisor::launch_shutdown",
-      "lint": "clippy::unwrap_used",
-      "path": "src/tasks/shutdown.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "ab5f6ab54d91cc0ea9ec9ab1ac608bb6bdf6857e84d599ebcc8c4a9374924207",
-      "item": "crate::TaskSupervisor::observe_shutdown",
-      "lint": "clippy::unwrap_used",
-      "path": "src/tasks/shutdown.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "b4c250e6670d01ae4792c586b20aef709d7b0665efc273d220a4caa8fd6b9cb3",
-      "item": "crate::TouchJournal::flush_bucket",
-      "lint": "clippy::unwrap_used",
-      "path": "src/touch.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "a7fae912a54e5fc1a2fd6fe904321b47d2a27fc4b93605dc0fd42722faea1edb",
-      "item": "crate::TouchJournal::ingest",
-      "lint": "clippy::unwrap_used",
-      "path": "src/touch.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "2c355b4eacb4c6bb50690d1dac2e09669bbed828167f3c16ff07a2a00c2024c9",
-      "item": "crate::TouchRegistry::close_shard",
-      "lint": "clippy::unwrap_used",
-      "path": "src/touch.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "79bf708a68180b65b78fb4b5de7c69048961f330cf30f057b3f782cac8932941",
-      "item": "crate::TouchRegistry::journal",
-      "lint": "clippy::unwrap_used",
-      "path": "src/touch.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "2047871277f8d0a05956c4e1cb344f06202a24b6f24cdfa44c02003dd37efc98",
-      "item": "crate::LiveFeed::read_and_publish",
-      "lint": "clippy::wildcard_enum_match_arm",
-      "path": "src/sse/feed.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "d5194dd5ab170c502ca6c19f699d99f9123bed3e9e3895962853cb317ccde6b0",
-      "item": "crate::LiveFeed::read_and_publish",
-      "lint": "clippy::wildcard_enum_match_arm",
-      "path": "src/sse/feed.rs"
-    },
     {
       "count": 1,
       "fingerprint": "f3255ca3e71639b9a0ca6912945433030f584778c2042d960ff77ca1a8ca55a2",
@@ -4830,13 +2881,6 @@
       "lint": "unreachable_pub",
       "path": "src/application/read_keys.rs"
     },
-    {
-      "count": 1,
-      "fingerprint": "4e88cb6514e617e1c971f3f310f8fa373479b64549b29331bfbbc294b88569cb",
-      "item": "crate::spawn_refresher",
-      "lint": "unreachable_pub",
-      "path": "src/auth_feed.rs"
-    },
     {
       "count": 1,
       "fingerprint": "86b45b21b38060107772bcbbe6d6d8321bc97e6f55ace1e028bc4c9933dde421",
@@ -4844,20 +2888,6 @@
       "lint": "unreachable_pub",
       "path": "src/bootstrap.rs"
     },
-    {
-      "count": 1,
-      "fingerprint": "6ca31a8ab2daa6134a18669c50ca283247b46bcd9efc9a73d74cbc16d2f0fa5e",
-      "item": "crate::TraceStore::with_options",
-      "lint": "unreachable_pub",
-      "path": "src/dst/trace_store.rs"
-    },
-    {
-      "count": 1,
-      "fingerprint": "9554e7d8e300567e64cd59df2571adaccca65e294d297e0dc3ae8116a5af864a",
-      "item": "crate::Fp::site",
-      "lint": "unreachable_pub",
-      "path": "src/failpoints.rs"
-    },
     {
       "count": 1,
       "fingerprint": "ffa2489531b69a28379bccc8278747181e096c43162692ea2da4e8c3a1d1cf9c",
@@ -4907,13 +2937,6 @@
       "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 +2965,6 @@
       "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..73c95534 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/sse/source/spans.rs",
+      "reason": "Lineage span rule imports its enclosing source owner; the compiler resolves the parent exports and the rule only maps linearized offsets.",
+      "syntax": "compiler-resolved import; syntax cannot infer exports"
+    },
+    {
+      "category": "unresolved-glob",
+      "count": 1,
+      "owner": "crate",
+      "path": "src/sse/feed/retention.rs",
+      "reason": "Retention entry imports its enclosing feed owner; the compiler resolves the parent exports and the entry only mirrors admission.",
+      "syntax": "compiler-resolved import; syntax cannot infer exports"
+    },
+    {
+      "category": "unresolved-glob",
+      "count": 1,
+      "owner": "crate",
+      "path": "src/sse/feed/test_support.rs",
+      "reason": "Feed budget test knobs import their enclosing feed owner; the compiler resolves the parent exports and the knobs only size, exhaust and release budgets.",
+      "syntax": "compiler-resolved import; syntax cannot infer exports"
+    },
+    {
+      "category": "effect",
+      "count": 1,
+      "owner": "crate::LiveFeed::schedule_transition_retry",
+      "path": "src/sse/feed.rs",
+      "reason": "The feed's transition retry is a bare task the feed owns and cancels through its own flag; it ends with the feed.",
+      "syntax": "tokio::spawn"
+    },
+    {
+      "category": "by-path-module",
+      "count": 1,
+      "owner": "crate::spans",
+      "path": "src/sse/source.rs",
+      "reason": "Lineage span rule; declared by path like the source's tests so the file name says what it holds; no copied source or public test API.",
+      "syntax": "path = \"source/spans.rs\""
     }
   ]
 }
diff --git a/docs/quality/source-allowances.json b/docs/quality/source-allowances.json
index 936f6d92..7889c60e 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,
@@ -1729,13 +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,
@@ -1743,20 +1680,6 @@
       "path": "src/sse/session.rs",
       "syntax": "allow (clippy :: too_many_arguments)"
     },
-    {
-      "category": "exception",
-      "count": 1,
-      "owner": "crate::LineageSource::sealed_span_page",
-      "path": "src/sse/source.rs",
-      "syntax": "allow (clippy :: too_many_arguments)"
-    },
-    {
-      "category": "exception",
-      "count": 1,
-      "owner": "crate::LineageSpan::identity",
-      "path": "src/sse/source.rs",
-      "syntax": "allow (dead_code)"
-    },
     {
       "category": "global",
       "count": 1,
@@ -1988,13 +1911,6 @@
       "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,
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..115cac03 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" -- > "$QUALITY_MUTANTS_OUT/harness-pr.diff"
 TOTAL=0
 REGISTERED=(src/bin/pilot/benchmark.rs src/bin/pilot/benchmark/config.rs src/bin/pilot/benchmark/window.rs src/bin/pilot/generator.rs src/bin/pilot/generator/membership.rs)
-for owner in postings_codec postings batch retained quota cursors queue rollup_allocation rollup_storage tasks touch read_accumulator read_spool shard_directory history_partition ops scaler postings_cache sharddir crypto tail_ring shard bootstrap read_request http_read queue_cleanup transaction_append record; do
+for owner in postings_codec postings batch retained quota cursors queue rollup_allocation rollup_storage tasks touch read_accumulator read_spool shard_directory history_partition ops scaler postings_cache sharddir crypto tail_ring shard bootstrap read_request http_read queue_cleanup transaction_append record tasks_shutdown runtime runtime_telemetry product_cursor quota_registry sse_source sse_source_spans sse_feed sse_feed_retention sse_feed_test_support; do
   case "$owner" in
     postings_codec) file=src/postings.rs; filter=postings:: ;;
     postings) file=src/postings/validated.rs; filter=postings:: ;;
@@ -41,6 +41,16 @@ 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:: ;;
+    sse_source) file=src/sse/source.rs; filter=sse:: ;;
+    sse_source_spans) file=src/sse/source/spans.rs; filter=sse:: ;;
+    sse_feed) file=src/sse/feed.rs; filter=sse:: ;;
+    sse_feed_retention) file=src/sse/feed/retention.rs; filter=sse:: ;;
+    sse_feed_test_support) file=src/sse/feed/test_support.rs; filter=sse:: ;;
+    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 +65,7 @@ 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 || "$owner" == sse_source || "$owner" == sse_source_spans || "$owner" == sse_feed || "$owner" == sse_feed_retention || "$owner" == sse_feed_test_support ]]; 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/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/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/feed.rs b/src/sse/feed.rs
index ceb78c73..4601082f 100644
--- a/src/sse/feed.rs
+++ b/src/sse/feed.rs
@@ -287,22 +287,6 @@ pub(crate) struct ProjectRetention {
     admission: std::sync::OnceLock<Arc<crate::quota::ProjectAdmission>>,
 }
 
-impl ProjectRetention {
-    pub(crate) fn bind_admission(&self, adm: Arc<crate::quota::ProjectAdmission>) {
-        let _ = self.admission.set(adm);
-    }
-    fn mirror_add(&self, bytes: u64) {
-        if let Some(a) = self.admission.get() {
-            a.retained_sse_add(bytes);
-        }
-    }
-    fn mirror_sub(&self, bytes: u64) {
-        if let Some(a) = self.admission.get() {
-            a.retained_sse_sub(bytes);
-        }
-    }
-}
-
 /// The project allowance: SSE_FEED_PROJECT_BYTES, defaulting to a
 /// QUARTER of the cell ceiling. Strict form for release validation
 /// (an unparseable value must fail boot, round-10e).
@@ -332,6 +316,10 @@ pub(crate) enum ReserveOutcome {
     GlobalOver,
 }
 
+#[expect(
+    clippy::unwrap_used,
+    reason = "FeedMemoryBudget; a poisoned project table may hold a half-charged retention entry; recovering it could exceed or leak the feed memory budget"
+)]
 impl FeedMemoryBudget {
     pub(crate) fn from_config(cfg: &crate::config::SseConfig) -> Self {
         let max = crate::sse::budget::feed_total_cap(cfg);
@@ -356,27 +344,6 @@ impl FeedMemoryBudget {
         }
     }
 
-    #[cfg(test)]
-    pub(crate) fn new_for_test(max: u64) -> Self {
-        Self {
-            reserved: AtomicU64::new(0),
-            max: AtomicU64::new(max),
-            // Unit rigs are single-project: the project backstop
-            // equals the ceiling unless a test narrows it.
-            project_cap: AtomicU64::new(max),
-            by_project: Mutex::new(std::collections::HashMap::new()),
-        }
-    }
-
-    /// Test-only: shrink the cell ceiling so exhaustion scenarios stay
-    /// cheap (per-rig — every AppState builds its own budget). The
-    /// project backstop follows at the default quarter.
-    #[cfg(test)]
-    pub(crate) fn set_max_for_test(&self, max: u64) {
-        self.max.store(max, Ordering::SeqCst);
-        self.project_cap.store(max / 4, Ordering::SeqCst);
-    }
-
     /// The per-project retention entry, shared by every feed of the
     /// project in this process; created on first use, removed by the
     /// LAST feed's drop (see `release_project_entry`).
@@ -436,34 +403,6 @@ impl FeedMemoryBudget {
             .collect()
     }
 
-    #[cfg(test)]
-    pub(crate) fn project_entries_for_test(&self) -> usize {
-        self.by_project.lock().unwrap().len()
-    }
-
-    /// Test-only exhaustion: reserve everything that remains, so the
-    /// next publication takes the uncached path. Returns the amount to
-    /// hand back via `release_for_test`.
-    #[cfg(test)]
-    pub(crate) fn exhaust_for_test(&self) -> u64 {
-        loop {
-            let cur = self.reserved.load(Ordering::SeqCst);
-            let take = self.max.load(Ordering::SeqCst).saturating_sub(cur);
-            if self
-                .reserved
-                .compare_exchange(cur, cur + take, Ordering::SeqCst, Ordering::SeqCst)
-                .is_ok()
-            {
-                return take;
-            }
-        }
-    }
-
-    #[cfg(test)]
-    pub(crate) fn release_for_test(&self, n: u64) {
-        self.reserved.fetch_sub(n, Ordering::SeqCst);
-    }
-
     /// Zero budget = singleton-only posture (docs/LIVE-FEED.md): no
     /// feed may admit a second subscriber.
     pub(crate) fn admits_shared(&self) -> bool {
@@ -478,6 +417,10 @@ impl FeedMemoryBudget {
     /// ALREADY reflects both sides: the caller must NOT release the
     /// replaced batches again. Checked arithmetic: any accounting
     /// drift fails CLOSED rather than wrapping.
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "FeedMemoryBudget::try_replace; the replacement nests the cell and project ceilings inside the compare-and-swap loop of the reservation; flattening it would separate the ceilings from the reservation they bound"
+    )]
     fn try_replace(&self, proj: &ProjectRetention, released: usize, add: usize) -> ReserveOutcome {
         let (rel, add) = (released as u64, add as u64);
         // PROJECT leg first (round-10 isolation): the offending
@@ -538,6 +481,10 @@ impl FeedMemoryBudget {
         }
     }
 
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "FeedMemoryBudget::release; the release nests the underflow guard inside the compare-and-swap loop; flattening it would separate the guard from the release it protects"
+    )]
     fn release(&self, proj: &ProjectRetention, charge: usize) {
         let charge = charge as u64;
         proj.mirror_sub(charge);
@@ -654,12 +601,20 @@ impl Drop for DriverPermit<'_> {
     }
 }
 
+#[expect(
+    clippy::unwrap_used,
+    reason = "LiveFeed; a poisoned feed state or source cell may hold a partially published frontier, subscriber accounting or swapped source; recovering it could deliver records twice, skip them or serve a retired source"
+)]
 impl LiveFeed {
     /// Round-13: bind this feed to the project's admission entry —
     /// charges the static feed weight exactly once (guard held by the
     /// feed; released at feed drop) and wires the retention mirror.
     /// Called inside the registry's CREATION closure only, so joiners
     /// never double-charge.
+    #[expect(
+        clippy::let_underscore_must_use,
+        reason = "LiveFeed::bind_pressure; the pressure entry is bound once per feed and a second bind names the same entry; a handled result would only restate the first bind"
+    )]
     pub(crate) fn bind_pressure(&self, adm: Arc<crate::quota::ProjectAdmission>) {
         self.project_reserved.bind_admission(adm.clone());
         let _ = self
@@ -746,6 +701,10 @@ impl LiveFeed {
     /// subscribe-time reconciliation may race to install the same
     /// extension, and the loser must be an idempotent no-op — never a
     /// second generation bump.
+    #[expect(
+        clippy::let_underscore_must_use,
+        reason = "LiveFeed::install_source; the source watch fails to send only when every session is gone; a handled result would only restate that nobody waits"
+    )]
     fn install_source(&self, next: Arc<dyn FeedSourceRead>) -> InstallOutcome {
         let mut w = self.src.write().unwrap();
         let old_sig = w.source.span_sig();
@@ -860,6 +819,11 @@ impl LiveFeed {
 
     /// Consume retained records at/after `cursor`. Lagged = below floor
     /// → disconnect-and-resume per the lag contract.
+    #[expect(
+        clippy::excessive_nesting,
+        clippy::expect_used,
+        reason = "LiveFeed::take_visible; the take nests the batch cut inside the visibility walk of the retained ring, whose front was checked before it is popped; flattening it or a fallible pop would separate the cut from the batch it serves"
+    )]
     pub(crate) fn take_visible(&self, cursor: u64) -> Take {
         let mut st = self.st.lock().unwrap();
         if cursor < st.floor {
@@ -917,6 +881,11 @@ impl LiveFeed {
     /// task re-drives at 250 ms until the transition resolves, the
     /// subscribers leave, or the feed tears down. Resolution bumps
     /// the version, waking every parked session.
+    #[expect(
+        clippy::disallowed_methods,
+        clippy::excessive_nesting,
+        reason = "LiveFeed::schedule_transition_retry; the retry is a bare task the feed owns and cancels through its own flag, nesting the abandoned and superseded verdicts inside the wake it awaits; a supervised task would tie a feed-scoped retry to the runtime supervisor and flattening the verdicts would separate them from the wake"
+    )]
     pub(crate) fn schedule_transition_retry(self: &Arc<Self>) {
         if self
             .retry_scheduled
@@ -988,6 +957,11 @@ impl LiveFeed {
         Some(DriverPermit(&self.driving))
     }
 
+    #[expect(
+        clippy::excessive_nesting,
+        clippy::let_underscore_must_use,
+        reason = "LiveFeed::drive_under_permit; the drive nests the install and incompatibility verdicts inside the transition arm of the permit-held loop and re-publishes through a watch whose send fails only when every session is gone; flattening it or a handled send would separate the verdicts from the permit that serialises them"
+    )]
     async fn drive_under_permit(&self) -> DriveOutcome {
         let mut swap_attempts = 0u8;
         // Lifecycle outcomes are REPEATABLE (every parked session must
@@ -1088,6 +1062,15 @@ impl LiveFeed {
         outcome
     }
 
+    #[expect(
+        clippy::too_many_lines,
+        clippy::let_underscore_must_use,
+        clippy::cast_possible_truncation,
+        clippy::excessive_nesting,
+        clippy::wildcard_enum_match_arm,
+        clippy::expect_used,
+        reason = "LiveFeed::read_and_publish; one read publishes its batch, charges retention, evicts within the ring budget from a pre-counted eviction set and answers every other reserve outcome alike, with payload lengths that fit u32 by the record ceiling; splitting it, handling the watch send, checking the length, flattening the eviction, naming every outcome or a fallible pop would separate the publication from the budget it must honour"
+    )]
     async fn read_and_publish(&self, src: &Arc<dyn FeedSourceRead>, head: u64) -> DriveOutcome {
         let read = tokio::select! {
             r = src.read_batch(head, self.read_cap) => r,
@@ -1269,6 +1252,10 @@ fn clear_ring(
 }
 
 impl Drop for LiveFeed {
+    #[expect(
+        clippy::unwrap_used,
+        reason = "LiveFeed::drop; a poisoned feed state at drop may hold a half-charged retention; recovering it could release bytes the budget never charged"
+    )]
     fn drop(&mut self) {
         // Release the ACTUAL retained bytes back to the process budget
         // (model B); the feed itself is being discarded.
@@ -1361,5 +1348,8 @@ pub(crate) enum DriveOutcome {
 // no-progress shapes that the HTTP-level suite cannot reach
 // deterministically.
 // ==================================================================
+mod retention;
+#[cfg(test)]
+mod test_support;
 #[cfg(test)]
 pub(crate) mod tests;
diff --git a/src/sse/feed/retention.rs b/src/sse/feed/retention.rs
new file mode 100644
index 00000000..1a9cbd48
--- /dev/null
+++ b/src/sse/feed/retention.rs
@@ -0,0 +1,22 @@
+//! The per-project retention entry's admission mirror.
+use super::*;
+
+impl ProjectRetention {
+    #[expect(
+        clippy::let_underscore_must_use,
+        reason = "ProjectRetention::bind_admission; the admission entry is bound once per project and a second bind names the same entry; a handled result would only restate the first bind"
+    )]
+    pub(crate) fn bind_admission(&self, adm: Arc<crate::quota::ProjectAdmission>) {
+        let _ = self.admission.set(adm);
+    }
+    pub(super) fn mirror_add(&self, bytes: u64) {
+        if let Some(a) = self.admission.get() {
+            a.retained_sse_add(bytes);
+        }
+    }
+    pub(super) fn mirror_sub(&self, bytes: u64) {
+        if let Some(a) = self.admission.get() {
+            a.retained_sse_sub(bytes);
+        }
+    }
+}
diff --git a/src/sse/feed/test_support.rs b/src/sse/feed/test_support.rs
new file mode 100644
index 00000000..3475b259
--- /dev/null
+++ b/src/sse/feed/test_support.rs
@@ -0,0 +1,50 @@
+//! Test-only knobs of the feed memory budget: sized, exhausted and released
+//! per rig.
+#![cfg(test)]
+use super::*;
+
+impl FeedMemoryBudget {
+    pub(crate) fn new_for_test(max: u64) -> Self {
+        Self {
+            reserved: AtomicU64::new(0),
+            max: AtomicU64::new(max),
+            // Unit rigs are single-project: the project backstop
+            // equals the ceiling unless a test narrows it.
+            project_cap: AtomicU64::new(max),
+            by_project: Mutex::new(std::collections::HashMap::new()),
+        }
+    }
+
+    /// Test-only: shrink the cell ceiling so exhaustion scenarios stay
+    /// cheap (per-rig — every AppState builds its own budget). The
+    /// project backstop follows at the default quarter.
+    pub(crate) fn set_max_for_test(&self, max: u64) {
+        self.max.store(max, Ordering::SeqCst);
+        self.project_cap.store(max / 4, Ordering::SeqCst);
+    }
+
+    pub(crate) fn project_entries_for_test(&self) -> usize {
+        self.by_project.lock().unwrap().len()
+    }
+
+    /// Test-only exhaustion: reserve everything that remains, so the
+    /// next publication takes the uncached path. Returns the amount to
+    /// hand back via `release_for_test`.
+    pub(crate) fn exhaust_for_test(&self) -> u64 {
+        loop {
+            let cur = self.reserved.load(Ordering::SeqCst);
+            let take = self.max.load(Ordering::SeqCst).saturating_sub(cur);
+            if self
+                .reserved
+                .compare_exchange(cur, cur + take, Ordering::SeqCst, Ordering::SeqCst)
+                .is_ok()
+            {
+                return take;
+            }
+        }
+    }
+
+    pub(crate) fn release_for_test(&self, n: u64) {
+        self.reserved.fetch_sub(n, Ordering::SeqCst);
+    }
+}
diff --git a/src/sse/feed/tests.rs b/src/sse/feed/tests.rs
index 138d391e..19f73616 100644
--- a/src/sse/feed/tests.rs
+++ b/src/sse/feed/tests.rs
@@ -910,3 +910,60 @@ impl Drop for PermitReleaseGuard {
         crate::failpoints::release(crate::failpoints::Fp::FeedAfterPermitRelease, "permit-once");
     }
 }
+
+/// The retention entry mirrors its exact reservation into the ONE bound
+/// admission entry: nothing before a bind, every add and sub after it,
+/// and a second bind never redirects the mirror.
+#[test]
+fn a_retention_entry_mirrors_its_reservation_into_its_bound_admission() {
+    let registry = crate::quota::QuotaRegistry::default();
+    let admission = |name: &str| {
+        let project = crate::tenant::ProjectId::new(name).unwrap();
+        let _ = registry
+            .admit(
+                &project,
+                &crate::project_policy::ProjectQuotas::default(),
+                1_000,
+            )
+            .unwrap();
+        registry.pressure_handle(&project).unwrap()
+    };
+    let first = admission("proj-mirror-first");
+    let second = admission("proj-mirror-second");
+    let entry = ProjectRetention {
+        reserved: AtomicU64::new(0),
+        cap_hits: AtomicU64::new(0),
+        admission: std::sync::OnceLock::new(),
+    };
+    entry.mirror_add(10);
+    assert_eq!(
+        first.estimated_pressure_bytes(),
+        0,
+        "nothing mirrors before a bind"
+    );
+    entry.bind_admission(first.clone());
+    entry.mirror_add(100);
+    assert_eq!(
+        first.estimated_pressure_bytes(),
+        100,
+        "an add mirrors exactly"
+    );
+    entry.mirror_sub(40);
+    assert_eq!(
+        first.estimated_pressure_bytes(),
+        60,
+        "a sub mirrors exactly"
+    );
+    entry.bind_admission(second.clone());
+    entry.mirror_add(1);
+    assert_eq!(
+        first.estimated_pressure_bytes(),
+        61,
+        "the first bind stays canonical"
+    );
+    assert_eq!(
+        second.estimated_pressure_bytes(),
+        0,
+        "a second bind is ignored"
+    );
+}
diff --git a/src/sse/source.rs b/src/sse/source.rs
index adb5d81d..8818fab6 100644
--- a/src/sse/source.rs
+++ b/src/sse/source.rs
@@ -39,6 +39,10 @@ impl SingleSource {
     }
 }
 
+#[expect(
+    clippy::unwrap_used,
+    reason = "SingleSource; a poisoned stream state may hold a half-advanced durable frontier; recovering it could serve a length never made durable"
+)]
 #[async_trait::async_trait]
 impl FeedSourceRead for SingleSource {
     async fn read_batch(&self, from: u64, max_bytes: usize) -> anyhow::Result<SourceBatch> {
@@ -165,11 +169,18 @@ struct LineageSpan {
     seg_id: u32,
     logical_start: u64,
     cap: Option<u64>,
-    #[allow(dead_code)] // identity is informational (engine/handle keying)
+    #[allow(
+        dead_code,
+        reason = "identity; the span keeps its segment identity for engine and handle keying; reading it here would restate the key the reader already holds"
+    )]
     identity: [u8; 16],
     reader: SpanReader,
 }
 
+/// The cached local reader of a sealed span: the engine and handle the
+/// last locally served page used.
+type LocalReader = tokio::sync::Mutex<Option<(Arc<ShardEngine>, Arc<StreamHandle>)>>;
+
 /// HOW a span's records are read (round-10 two-instance model):
 /// metadata (`seg_id`/`logical_start`/`cap`) answers `locate`/
 /// `logicalize` without opening anything; only reads need a reader.
@@ -186,7 +197,7 @@ enum SpanReader {
         route: [u8; 16],
         target: crate::application::read_remote::InternalTarget,
         owner_hint: std::sync::RwLock<Option<String>>,
-        local: tokio::sync::Mutex<Option<(Arc<ShardEngine>, Arc<StreamHandle>)>>,
+        local: LocalReader,
     },
     /// The LIVE tail: LOCAL ONLY (locked architecture). Every read
     /// confirms this instance is still the effective owner; a moved
@@ -199,20 +210,6 @@ enum SpanReader {
     },
 }
 
-/// Round-11.2: a FATAL span error carried through anyhow — the feed
-/// downcasts it and turns the source's lifecycle into the typed
-/// cutoff instead of retrying forever.
-#[derive(Debug, Clone, Copy)]
-pub(crate) struct FatalSpanCutoff(pub(crate) super::feed::SourceCutoff);
-
-impl std::fmt::Display for FatalSpanCutoff {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "fatal span cutoff: {:?}", self.0)
-    }
-}
-
-impl std::error::Error for FatalSpanCutoff {}
-
 /// Is this instance the effective owner of `route`'s shard? None-ring
 /// (single instance) counts as ours.
 fn owned_here(state: &crate::application::read::ReadService, route: &[u8; 16]) -> bool {
@@ -277,6 +274,10 @@ impl LineageSource {
     /// (mirrors the legacy keyed-lineage construction: segments
     /// containing the lane's key point, ordered by
     /// `(created_ms, seg_id)`).
+    #[expect(
+        clippy::excessive_nesting,
+        reason = "LineageSource::build; the chain build nests the owner, engine and handle resolution inside each segment's span; flattening it would separate the span from the owner it was built under"
+    )]
     pub(crate) async fn build(
         state: Arc<crate::application::read::ReadService>,
         desc: StreamDesc,
@@ -401,14 +402,20 @@ impl LineageSource {
     /// protocol with at most one verified redirect. Fatal outcomes
     /// ride `FatalSpanCutoff`; retryables stay anyhow errors (the
     /// session's bounded-backoff retry).
-    #[allow(clippy::too_many_arguments)]
+    #[expect(
+        clippy::too_many_arguments,
+        clippy::too_many_lines,
+        clippy::excessive_nesting,
+        clippy::unwrap_used,
+        reason = "LineageSource::sealed_span_page; a sealed span's page resolves the current owner, serves locally or through one redirect and caches the reader and owner hint it used, and a poisoned hint may hold a half-recorded owner that could route the next page to the wrong instance; a request struct, a split, a flattened resolution or a recovered hint would separate the page from the owner resolution it must repeat"
+    )]
     async fn sealed_span_page(
         &self,
         span: &LineageSpan,
         route: &[u8; 16],
         target: &crate::application::read_remote::InternalTarget,
         owner_hint: &std::sync::RwLock<Option<String>>,
-        local: &tokio::sync::Mutex<Option<(Arc<ShardEngine>, Arc<StreamHandle>)>>,
+        local: &LocalReader,
         local_from: u64,
         budget: usize,
     ) -> anyhow::Result<crate::application::read::ReadPage> {
@@ -548,11 +555,20 @@ impl LineageSource {
         }
     }
 
+    #[expect(
+        clippy::expect_used,
+        reason = "LineageSource::tail; a lineage is built with at least one span and never emptied; a fallible tail would add a branch no source reaches"
+    )]
     fn tail(&self) -> &LineageSpan {
         self.spans.last().expect("non-empty lineage")
     }
 }
 
+#[expect(
+    clippy::too_many_lines,
+    clippy::unwrap_used,
+    reason = "LineageSource; one batch walks the span chain until the budget or the frontier stops it, and a poisoned stream state may hold a half-advanced durable frontier; splitting the walk would separate it from its budget and recovering the state could serve a length never made durable"
+)]
 #[async_trait::async_trait]
 impl FeedSourceRead for LineageSource {
     async fn read_batch(&self, from: u64, max_bytes: usize) -> anyhow::Result<SourceBatch> {
@@ -783,6 +799,13 @@ impl FeedSourceRead for LineageSource {
 /// source implementation. Called ONLY under the feed's driver permit.
 /// Genuine-close detection uses the read service incarnation boundary
 /// (no materialized map, or a <=1-segment map with nothing pending).
+#[expect(
+    clippy::too_many_arguments,
+    clippy::too_many_lines,
+    clippy::excessive_nesting,
+    clippy::let_underscore_must_use,
+    reason = "refresh_transition; the resume takes the state, descriptor, key, epoch, filter and signature the source built with, walks one bounded deadline across attempts whose waits nest inside the pending-transition branch, and a timed-out ticket wait simply re-reads; a request struct, a split, a flattened wait or a handled timeout would separate the attempts from the deadline they share"
+)]
 pub(crate) async fn refresh_transition(
     state: &Arc<crate::application::read::ReadService>,
     desc: &StreamDesc,
@@ -955,30 +978,10 @@ pub(crate) async fn refresh_transition(
     Ok(SourceTransition::RetryLater)
 }
 
-/// The linearization rule (engine-free, so the mapping itself is
-/// unit-testable): a linearized one-past offset maps to the span
-/// covering it; the boundary one-past a sealed span's cap belongs to
-/// the NEXT span at local 0.
-fn locate_in_spans(spans: &[(u32, u64, Option<u64>)], logical_after: u64) -> WirePosition {
-    for (i, (seg, start, cap)) in spans.iter().enumerate() {
-        let last = i + 1 == spans.len();
-        match cap.map(|c| start + c) {
-            Some(e) if logical_after >= e && !last => continue,
-            Some(e) if logical_after > e => continue,
-            _ => {
-                return WirePosition {
-                    seg_id: *seg,
-                    local_after: logical_after - start,
-                };
-            }
-        }
-    }
-    let (seg_id, start, _) = spans.last().copied().expect("non-empty lineage");
-    WirePosition {
-        seg_id,
-        local_after: logical_after.saturating_sub(start),
-    }
-}
+#[path = "source/spans.rs"]
+mod spans;
+pub(crate) use spans::FatalSpanCutoff;
+use spans::locate_in_spans;
 
 #[cfg(test)]
 #[path = "source/tests.rs"]
diff --git a/src/sse/source/spans.rs b/src/sse/source/spans.rs
new file mode 100644
index 00000000..fce7246f
--- /dev/null
+++ b/src/sse/source/spans.rs
@@ -0,0 +1,48 @@
+//! The lineage's engine-free pieces: the linearization rule and the fatal
+//! cutoff that rides through anyhow.
+use super::*;
+
+/// Round-11.2: a FATAL span error carried through anyhow — the feed
+/// downcasts it and turns the source's lifecycle into the typed
+/// cutoff instead of retrying forever.
+#[derive(Debug, Clone, Copy)]
+pub(crate) struct FatalSpanCutoff(pub(crate) crate::sse::feed::SourceCutoff);
+
+impl std::fmt::Display for FatalSpanCutoff {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "fatal span cutoff: {:?}", self.0)
+    }
+}
+
+impl std::error::Error for FatalSpanCutoff {}
+
+/// The linearization rule (engine-free, so the mapping itself is
+/// unit-testable): a linearized one-past offset maps to the span
+/// covering it; the boundary one-past a sealed span's cap belongs to
+/// the NEXT span at local 0, and the last span, sealed or live, absorbs
+/// everything past its start through the fallback below.
+#[expect(
+    clippy::expect_used,
+    reason = "locate_in_spans; a lineage is built with at least one span, so the last span exists; a fallible tail would add a branch no lineage reaches"
+)]
+pub(super) fn locate_in_spans(
+    spans: &[(u32, u64, Option<u64>)],
+    logical_after: u64,
+) -> WirePosition {
+    for (seg, start, cap) in spans {
+        match cap.map(|c| start + c) {
+            Some(e) if logical_after >= e => continue,
+            _ => {
+                return WirePosition {
+                    seg_id: *seg,
+                    local_after: logical_after - start,
+                };
+            }
+        }
+    }
+    let (seg_id, start, _) = spans.last().copied().expect("non-empty lineage");
+    WirePosition {
+        seg_id,
+        local_after: logical_after.saturating_sub(start),
+    }
+}
diff --git a/src/sse/source/tests.rs b/src/sse/source/tests.rs
index 5d65127b..d764bce0 100644
--- a/src/sse/source/tests.rs
+++ b/src/sse/source/tests.rs
@@ -40,3 +40,28 @@ fn sig_compatibility_rules() {
     // Identity.
     assert!(sig_compatible(&old2, &old2));
 }
+
+/// The fatal cutoff carried through anyhow names the reason the feed
+/// downcasts, so a bare error message never hides which cutoff fired.
+#[test]
+fn a_fatal_span_cutoff_names_its_reason() {
+    let cutoff = crate::sse::source::FatalSpanCutoff(crate::sse::feed::SourceCutoff::WrongOwner);
+    assert_eq!(cutoff.to_string(), "fatal span cutoff: WrongOwner");
+}
+
+/// The linearization rule: a one-past offset maps to the span covering
+/// it, the boundary one-past a sealed cap belongs to the next span at
+/// local 0, and the live tail absorbs everything past the last cap.
+#[test]
+fn linearized_offsets_map_to_the_span_that_covers_them() {
+    let spans = [(1u32, 0u64, Some(10u64)), (2, 10, Some(5)), (3, 15, None)];
+    let at = |logical_after: u64| {
+        let pos = super::spans::locate_in_spans(&spans, logical_after);
+        (pos.seg_id, pos.local_after)
+    };
+    assert_eq!(at(7), (1, 7), "inside the first sealed span");
+    assert_eq!(at(10), (2, 0), "the boundary belongs to the next span");
+    assert_eq!(at(12), (2, 2), "inside the second sealed span");
+    assert_eq!(at(15), (3, 0), "the second cap hands over to the live tail");
+    assert_eq!(at(40), (3, 25), "the live tail is open-ended");
+}
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/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