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Salvage of PR #2875 (which subsumes the base projection from #2873), rebased onto current master with the release bookkeeping (VERSION / package.json / CHANGELOG) dropped, plus one hot-path hardening fix. Salvaged (verified on this head): - project trusted message_id / thread_id / Message-ID-gated source_subject through keyword, chunk-keyword, CJK, and vector paths in BOTH engines - preserve the citation DTO through alias injection, relational recall/fanout, two-pass hydration, vector fusion/reranking, and semantic-cache hits - raw source_subject is never trusted; only allowlisted `subject` may supply it, and only when a nonblank Message-ID proves the page is an email; malformed/non-object frontmatter fails closed (no double-decode) - source visibility / quarantine / deletion rechecked across indirect retrieval paths (alias hop, relational hydrate, two-pass expansion, graph walk, cache-hit gate) - typed JSON cache scope keys (scalar/set/all) — injective encoding, no forged-key collisions; store-side write gate skips writeback when the page-generation clock advanced during the producing search - KNOBS_HASH_VERSION 12 -> 13 so pre-projection cached DTOs miss instead of replaying the old shape Fixed on top of the original head (the flagged hot-path defect): - cacheScopeKey's forged-id rejection was evaluated inline at the cache lookup/store call sites inside hybridSearchCached, outside any catch — an invalid scope id broke the whole search instead of skipping the cache. The key is now computed once, fail-open: invalid scope => cache skipped, search unaffected. Pinned by test/search/hybrid-cache-scope-failopen.serial.test.ts (fails on the original head, passes here). Verified on this exact head: typecheck clean; 379 touched unit tests, 3 serial files (one process each), pglite cache-gate/source-isolation e2e, and real-PostgreSQL engine-parity (26 pass) + source-routing — all green. jsonb-pattern/params, key-files-current-state, test-isolation, progress-to-stdout guards clean. Closes #2962 Co-authored-by: amtagrwl <amtagrwl@users.noreply.github.com> Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>