fc019b2688
trek-e's review found the M1 PID-liveness backport dropped two pieces of capability-lock.cts's steal-safety machinery, reopening the #500/#905/#1230 lost-update family: - Empty-body window (state.cts): acquireStateLock creates the lock with O_EXCL and writes the pid in a separate writeSync; a lock observed in that gap has an empty body, reads as not-verified-live, and was stolen at age ~0 — robbing a holder mid-creation. Add a fresh-create floor scoped to the unverifiable-body case: an empty/unparseable body that is fresh is treated as mid-creation and is NOT stolen, while a COMPLETE dead-pid body is still stolen promptly (preserves the prompt-dead-steal contract). planning-workspace writes its body atomically (flag:'wx') so it has no empty-body window. - Double-steal (both locks): the steal was a bare fs.unlinkSync with no identity re-confirm, so two waiters could both reclaim a dead holder and end up holding concurrently. Replace with an atomic renameSync (only one racer wins the inode) guarded by a (dev,ino,body) identity re-confirm immediately before the steal; body content is part of the identity to defeat inode reuse. Tests (seam-driven, no wall-clock, each proven RED-before-GREEN): - clock-seam: fresh empty-body lock is not stolen at age ~0; a racer-recreated live lock is not double-stolen (identity re-confirm). Adds a beforeSteal seam. - planning-workspace: racer-recreated live lock is not double-stolen. - Updated the two #1217 unlinkSync-failure tests to the renameSync steal path (the bounded-backoff/no-busy-spin guarantee is preserved and re-asserted). Uncontended acquire path is byte-for-byte unchanged. Claude-Session: https://claude.ai/code/session_01R88n7Q54bAaVHFkDbbH1yz
Changeset Fragments
This directory holds per-PR CHANGELOG fragments. Every PR with user-facing changes drops one (or more) <random-name>.md files here describing its CHANGELOG entry. Fragments are consolidated into the top-level CHANGELOG.md at release time.
Why
Two PRs that both edit the ### Fixed block of CHANGELOG.md always conflict on merge — git can't pick a serialization order without human input. Two PRs that each add a fresh .changeset/<unique-name>.md never conflict because they don't share lines.
See #2975 for the full rationale.
Adding a fragment
node scripts/changeset/new.cjs \
--type Fixed \
--pr 1234 \
--body "fix the thing — explain the user-visible change in one sentence"
This writes .changeset/<adjective>-<noun>-<noun>.md with frontmatter and a body. Three random words → concurrent PRs don't collide.
Format
---
type: Fixed
pr: 1234
---
**`/gsd-foo` no longer drops trailing slashes** — explain the user-visible change.
Allowed type: values follow Keep a Changelog: Added, Changed, Deprecated, Removed, Fixed, Security.
Opting out
PRs that legitimately have no user-facing impact can add the no-changelog label. CI honors it. When unsure, add the fragment.
At release time
Promotion is automatic. The release workflow's finalize job runs:
node scripts/changeset/cli.cjs render --version vX.Y.Z --date YYYY-MM-DD --allow-empty
This reads every fragment, groups bullets by type:, replaces ## [Unreleased] with a new ## [vX.Y.Z] - YYYY-MM-DD block, opens a fresh ## [Unreleased] above, and deletes consumed fragments. The --allow-empty flag ensures a no-change release still gets a dated heading (with a _No notable changes._ placeholder). A subsequent verify step confirms the promotion landed correctly. Maintainers do not run this by hand.
Archived fragments
.changeset/archived/ holds fragments for already-shipped releases (≤ 1.3.1), retained for provenance. Their content was hand-curated into the dated ## [1.x.y] sections of CHANGELOG.md during the #690 backfill — they were never consumed by render. All changeset tooling enumerates .changeset/ non-recursively, so archived fragments are never picked up or rendered. Do not move them back to the top level.