feat(run-ops): webapp db topology, flags, and split-mode resolver wiring#4117

Draft

d-cs wants to merge 9 commits into

runops/pr04-store-enginefrom

runops/pr05-webapp-foundation

Commits on Jul 2, 2026

feat(run-ops): webapp db topology, flags, migration helpers + store/engine wiring

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refactor(run-ops): drop known-migrated read layer; residency is id-shape only

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test(run-ops): add cache + distinct-db sentinel tests; drop test enumeration labels

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build(run-ops): sync pnpm-lock apps/webapp importer with its declared deps

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style(run-ops): apply oxfmt

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fix(run-ops split): interlock split mode against native realtime backend

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fix(run-ops split): gate topology split on the opt-in flag and tighten diagnostics

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test(webapp): cap vitest fork concurrency to bound testcontainer memory on CI
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chore(webapp): drop vitest maxForks cap (broke typecheck; superseded by worker-mock fix)
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