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Garry TanandClaude Fable 5
3023216b87
Atomic tmp-write-then-rename was reimplemented ~20 times across lib/, bin/, and browse/src with three tmp-suffix conventions. One of them was a latent bug this commit closes: lib/worktree.ts used a bare '.tmp' suffix — the deterministic-tmp collision race browse/src/server.ts documents having hit in production (its fix, pid+random, was trapped in a comment at one site). lib/fs-atomic.ts: atomicWriteSync (always throws, best-effort tmp cleanup, pid+random suffix, optional mode applied at tmp creation so the file never exists with looser permissions) + atomicWriteQuiet (shutdown paths only). Unit tests pin the throw/quiet contracts, 0600 mode, tmp-name uniqueness (captured via the read-only-dir failure path — Bun's fs exports are readonly, no monkeypatching), and no-stray-tmp cleanup. Migrated: lib/worktree.ts (the bare-.tmp bug), lib/gstack-decision.ts (snapshot + compact log), lib/gbrain-local-status.ts (probe cache). browse sites follow separately. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>