src/core/sync-concurrency.ts — single source of truth for autoConcurrency()
+ parseWorkers() + shouldRunParallel() + constants. Replaces three drifted
call-site policies (performSync, performFullSync, jobs handler).

src/core/db-lock.ts — generic tryAcquireDbLock(engine, lockId, ttlMinutes)
over the existing gbrain_cycle_locks table. Parameterized lock id so
performSync (gbrain-sync) can nest cleanly under cycle.ts (gbrain-cycle)
without deadlock.

test/sync-concurrency.test.ts — 17 cases covering PGLite-forces-serial,
explicit override clamping, auto-path threshold, parseWorkers validation
(rejects 0, negatives, NaN, decimals, trailing chars).

No consumers yet; subsequent commits wire sync.ts, import.ts, and jobs.ts
to use these helpers.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CODEX-2: wrap performSync body in a gbrain-sync DB lock so two concurrent
syncs (manual + autopilot, two terminals, two Conductor workspaces) cannot
both read last_commit, both write it unconditionally, and let the last
writer win. cycle.ts continues to hold gbrain-cycle for its broader scope;
the two ids nest cleanly.

CODEX-3: capture git HEAD at sync entry, re-rev-parse after the import
phase, refuse to advance last_commit if HEAD drifted (someone ran
git checkout / git pull mid-sync). Vanished files now go into failedFiles
instead of silent-skip — same gating mechanism, no more bookmark advance
past unimported work.

A1: replace both PGLite detection sites with engine.kind === 'pglite'.
The constructor.name sniff is gone (breaks under bundling) and so is the
inconsistent config?.engine string check.

A2: connect worker engines serially into an array, run inside try/finally
so disconnect always fires — even on partial connect failure, OOM, or
mid-import abort. Prior Promise.all(...disconnect) leaked the 8 worker
connections on any panic path.

Q1: explicit --workers / opts.concurrency now bypasses the >50-file floor.
User opt-in beats the auto-path safety net.

Q3: drop the config!.database_url! non-null assertions; fall back to serial
when database_url is unset instead of crashing on TypeError.

Q4: worker-count banner moves from console.log to console.error so stdout
stays clean for --json output.

test/sync-parallel.test.ts — 7 cases over PGLite covering the bookmark
gate under concurrency request, the head-drift gate, vanished-file
failure capture, PGLite-stays-serial, and the writer-lock contract.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

…Workers

A1: replace the config?.engine === 'pglite' string sniff with
engine.kind === 'pglite' to match sync.ts and the v0.13.1 contract.

A2: wrap worker engine creation + the parallel loop in try/finally so
disconnects always fire — same pattern as sync.ts. Worker engines now
push onto an array as they connect (rather than Promise.all) so the
finally block can clean up partial-connect state.

Q2: route --workers parsing through the shared parseWorkers() helper.
parseInt-with-no-validation is gone — '0', '-3', 'foo', '1.5' now exit
with a clear error message instead of silently falling through.

Q3: drop the config!.database_url! non-null assertion; fall back to
serial when database_url is unset.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CODEX-1: resolve sourceId at handler entry by looking up sources.local_path.
Mirrors cycle.ts:480's autopilot-cycle fix (PR #475). Without this, every
Minion sync job on a multi-source brain reads global config.sync.last_commit
instead of the per-source anchor, which on a regularly-GC'd repo can drop
out of git history and trigger 30-min full reimports every cycle.

The handler accepts an optional sourceId job param for callers that want
to override; falls back to the resolveSourceForDir lookup when absent.

CODEX-4: replace the hardcoded concurrency=4 default with the shared
autoConcurrency policy. Behavior is now consistent between CLI sync,
the Minion handler, and the autopilot cycle's sync phase. Jobs that
request a specific concurrency via job.data.concurrency still win.

noEmbed default stays at true — embed is a separate job (submit
gbrain embed --stale, OR rely on the autopilot cycle's embed phase).
The doc comment makes that contract explicit.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

DATABASE_URL-gated E2E coverage that PGLite-only tests can't reach:

T2 — happy path: 60 files imported at concurrency=4, all 60 pages land
in the DB, with a pg_stat_activity probe before/after to confirm worker
engines (4 × 2 connections) actually disconnected.

P4 — benchmark: 120-file fixture, serial vs concurrency=4 timing.
Emits a single-line `SYNC_PARALLEL_BENCH 120 files | serial=Xms |
parallel(4)=Yms | speedup=Zx` so the CHANGELOG can quote a real
number instead of an unbacked '~4×' claim. Asserts parallel <=
serial * 1.5 to allow for noisy CI but fail genuine regressions.

Skips gracefully when DATABASE_URL is unset (consistent with the rest
of test/e2e/).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

VERSION + package.json + bun.lock: 0.22.5/0.22.6 → 0.22.10. Repo had
existing drift between VERSION and package.json on master; this commit
brings them back in sync at the bumped value.

CHANGELOG.md: v0.22.10 entry replaces the unfinished v0.23.0 stub from
PR #490's original commit. Voice-rule clean (no em dashes, no AI
vocabulary), real benchmark numbers from the new E2E test
(serial=289ms parallel(4)=221ms speedup=1.31x), additive worker-pool
note (A3), 'To take advantage of v0.22.10' self-repair block per
CLAUDE.md convention.

TODOS.md: A4 follow-up filed — plumb resolved database_url through
SyncOpts so performSync / performFullSync / import.ts don't each call
loadConfig() separately. Deferred to a future patch; not on the
v0.22.10 critical path.

Patch (not minor) framing held even though new CLI surface lands here;
release-notes prose names the behavior change explicitly so users know
to read them.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CLAUDE.md:
- New "Key files" entries for src/core/sync-concurrency.ts and
  src/core/db-lock.ts (both v0.22.10).
- New "Key files" entry for src/commands/sync.ts (covers the lock,
  head-drift gate, engine.kind discriminator, vanished-file failure
  capture, parallel branch wiring).
- Updated src/commands/jobs.ts entry with v0.22.10 sourceId
  resolution + autoConcurrency policy + noEmbed contract.
- Added test/sync-concurrency.test.ts and test/sync-parallel.test.ts
  to the unit-test list with case counts.
- Added test/e2e/sync-parallel.test.ts to the E2E section with the
  SYNC_PARALLEL_BENCH grep marker for CHANGELOG quoting.
- Added "Key commands added in v0.22.10" section: gbrain sync --workers,
  gbrain import --workers (parseWorkers validation).

README.md: added --workers flag to the IMPORT section's gbrain sync
and gbrain import lines, with the >100-file auto-parallelize note.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

# Conflicts:
#	CHANGELOG.md
#	CLAUDE.md
#	TODOS.md
#	VERSION
#	package.json

# Conflicts:
#	CHANGELOG.md
#	CLAUDE.md
#	VERSION
#	package.json

VERSION 0.22.10 → 0.22.13. Master moved to 0.22.8 plus claimed slots
0.22.9-0.22.12 in sibling workspaces; 0.22.13 is the next free slot for
this PR's parallel-sync hardening work.

Updated all v0.22.10 references in CHANGELOG.md (release header +
self-repair block), TODOS.md (D-PR490-1 follow-up tag), CLAUDE.md
(Key files entries + tests + commands subsection), and the inline
v0.22.10 markers in src/core/sync-concurrency.ts, src/core/db-lock.ts,
src/commands/sync.ts, src/commands/import.ts, src/commands/jobs.ts,
test/sync-parallel.test.ts, test/e2e/sync-parallel.test.ts.

No behavioral change. CHANGELOG header rewrite, content unchanged.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CI's build-llms generator test failed because llms-full.txt was stale
relative to the README + CLAUDE.md updates this PR added (--workers
flag in the IMPORT section, sync-concurrency.ts/db-lock.ts/sync.ts
entries in the Key files section).

Per CLAUDE.md: "Run \`bun run build:llms\` after adding a new doc."
The test test/build-llms.test.ts:67 verifies committed bundles match
generator output — now they do again.

llms.txt was already in sync (no curated config additions); only
llms-full.txt needed the regen.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

# Conflicts:
#	CHANGELOG.md
#	TODOS.md
#	VERSION
#	package.json

# Conflicts:
#	CHANGELOG.md
#	CLAUDE.md
#	VERSION
#	llms-full.txt
#	package.json
#	src/commands/sync.ts