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Pages were unreachable by their own exact titles: FTS indexed only chunk body text while the title-weighted pages.search_vector (GIN-indexed since its introduction) was never queried by any search path, and websearch_to_tsquery AND-at-chunk-grain semantics meant one non-matching token zeroed keyword recall with no fallback — long or acronym-bearing titles (e.g. "IAWG ... AAR-LL deck") fell through to the vector arm alone and missed. - searchTitles (both engines): page-grain candidate arm over pages.search_vector (title 'A' + compiled_truth 'B' + timeline 'C'), ts_rank_cd ranked, representative-chunk LATERAL join, full filter parity with searchKeyword (visibility, soft-delete, source grants, hard-excludes, dates, types); fused as a weighted RRF list at the keyword arm's intent-effective k on all three hybrid return paths; fail-open with warnOncePerProcess. No schema changes — the index already existed, dark. - AND->OR one-retry fallback for the keyword arm, gated behind SearchOpts.orFallback (only hybridSearch opts in; countMentions, link resolution, eval, and keyword-only MCP callers keep the strict-AND contract). Refused for queries carrying websearch operators (negation, quoted phrases). searchTitles carries its own page-grain fallback. - Lexical arms parallelized (Promise.all) on the main path. Verified: typecheck clean; 18 hermetic PGLite tests + 2 engine-parity e2e cases (CI Postgres); consumer regression enrichment 18/0 + link-extraction 127/0; independent live QA on a 10,664-page brain — exact-title target miss -> rank 1 (exact_title_match), controls held, negation/quoted guards proven, strict-consumer contract pinned. Diagnosed from a 3-lane read-only diagnostic; adversarial review round closed findings on fallback scope, Postgres test coverage, and operator handling before this commit. Co-authored-by: Aleksei Razsadin <razsoc.01@gmail.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>