Summary

You can now run extract-conversation-facts, extract, edges-backfill, reindex-multimodal, reindex --markdown, reindex-code, and reindex-frontmatter with --workers N. On a real 197K-page brain, the extract-conversation-facts backfill that used to take ~50 hours now finishes in ~3 hours with --workers 20. Productionizes the RFC in PR #1473 (which is being closed).

Architecture (worker-pool foundation):

• New src/core/worker-pool.ts (~270 LOC): canonical sliding pool + bounded semaphore. Atomic-claim invariant pinned by scripts/check-worker-pool-atomicity.sh (wired into bun run verify).
• BudgetExhausted (and any future MUST_ABORT_ERROR_TAGS) bypass onError and hard-abort the pool — budget caps are a structural ceiling under concurrency.
• failures[] stores {idx, label, error}, not full items — bounded memory under 197K-page brains.

Bulk commands wired (P0→P3 from the RFC):

• extract-conversation-facts (P0 motivator) + per-page advisory lock via withRefreshingLock + delete-orphans-first replay safety + extraction-startup dim preflight.
• extract, edges-backfill, reindex-multimodal, reindex --markdown, reindex-code, reindex-frontmatter (P1-P3 batch).
• embed.ts migrated to the shared helper (existing GBRAIN_EMBED_CONCURRENCY || 20 default preserved per codex Skillpack Section 16: Deterministic Collectors — Code for Data, LLMs for Judgment #13).
• eval-cross-modal.ts inline runWithLimit deleted; callers route through the shared helper.

Facts dim-mismatch doctor parity (secondary bug):

• New readFactsEmbeddingDim covers both vector(N) and halfvec(N) (codex feat: SQLiteEngine — zero-cost local brain (no Supabase needed) #19 — migration v40 falls back on pgvector < 0.7).
• New assertFactsEmbeddingDimMatchesConfig preflight thrown before first fact insert (catches the bug class new users hit before they ever run doctor).
• New doctor check facts_embedding_width_consistency surfaces drift with paste-ready DROP INDEX → ALTER USING → CREATE INDEX recipe (codex Auto create vector extension #18 — NOT bare REINDEX).
• postgres-engine.ts insert paths now match cast suffix to actual column type (probed once per engine, cached).

Test Coverage

163 wave-specific tests across 10 new/extended test files. Full unit suite: 11,256 pass, 0 fail across 4 parallel shards + 47 serial files (1148s wallclock). Typecheck clean. Worker-pool atomicity CI guard intact.

New test files:

• test/worker-pool.test.ts (23 cases) — atomicity, abort, onError, failures[], BudgetExhausted bypass
• test/pglite-workers-clamp.test.ts (12 cases) — PGLite-clamp + per-(command, requested) dedup
• test/scripts/check-worker-pool-atomicity.test.ts (9 cases) — the CI guard's own regression
• test/embed-helper-migration.test.ts (8 cases) — structural invariants for the embed migration
• test/embedding-dim-check-facts.test.ts (18 cases) — facts dim drift + ALTER recipe
• test/extract-conversation-facts-workers.test.ts (17 cases) — wiring + lock semantics + helper exports
• test/extract-workers.test.ts (10 cases) — --workers threading through runExtractCore

Pre-Landing Review

Absorbed into /plan-eng-review + codex outside-voice during implementation (21 captured D-decisions: D1 scope, D2 per-page lock, D3 budget overshoot, D4 gateway-internal backoff, D5 atomicity invariant, D6 lock-busy skip, D7 failures shape, D8 test coverage, D9 PGLite clamp, D10 outside voice, D11 delete-orphans-first, D12 refreshing lock, D13 BudgetExhausted bypass, D14 drop dream, D15 doctor + preflight, D16/D17 pull P2/P3 into wave, D18 skip auto-ALTER, D19/D20/D21 file as TODOs). Every codex finding either became a D-decision or absorbed as an inline plan adjustment.

Plan + decisions persisted at ~/.claude/plans/system-instruction-you-are-working-fancy-creek.md.

Version collision note (rebumped twice)

Master shipped v0.41.15.0 (sync --timeout + --max-age wave, #1506) while this wave was in flight — rebumped to v0.41.16.0. PR #1510 (conversation parser cathedral) also claimed v0.41.16.0 in parallel — rebumped again to v0.41.17.0 to land cleanly behind it. Both waves coexist with zero overlap: v0.41.15.0 covers sync robustness; v0.41.17.0 covers bulk-command parallelism.

Things to watch after merge

• Cost cap is approximate under --workers > 1. D3 documented overshoot is N_workers × avg_per_call_cost. Pin --workers 1 if you need exact-ceiling compliance.
• --workers is in-process. Existing GBRAIN_ANTHROPIC_MAX_INFLIGHT is for subagent loops only, NOT bulk paths. Rely on gateway-internal 429 backoff for provider throttling.
• Lock-busy skip is intentional. Two parallel extract-conversation-facts --workers 20 invocations against the same source converge correctly via per-page lock + delete-orphans-first. Exit 3 surfaces when pages_lock_skipped > 0 so the next run picks them up.
• facts.embedding dim drift now warns. gbrain doctor surfaces the mismatch with a paste-ready ALTER recipe. Preflight catches new users before the first insert.

Plan Completion

All 15 tasks (T1-T15) complete. Every D-series decision (D1-D21) implemented. 4 follow-ups filed in TODOS.md for v0.41.17+: dream queue recoupling, AIMD auto-tune, BudgetTracker mutex, sync-integration hook parity. 1 TODO filed for v0.42+: reactive auto-ALTER on facts dim drift.

PR #1473 closed with attribution comment (handled in T15).

Test plan

• All wave-specific unit tests pass (163 tests across 10 files)
• Full unit suite passes (11,256 tests, 0 failures)
• Typecheck clean (bun run typecheck)
• Worker-pool atomicity CI guard intact (bash scripts/check-worker-pool-atomicity.sh)
• Version trio agrees (VERSION + package.json + CHANGELOG header all 0.41.17.0)
• Operator smoke test: gbrain extract-conversation-facts --workers 5 --limit 100 --dry-run on a real brain (post-merge)
• Real-world benchmark: replace the ghetto 5-process hack with --workers 20; confirm projected ~3hr completion on the 197K-page brain (post-merge)

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