Tom Boucher 60fa2936dd fix(core): add atomicWriteFileSync to prevent truncated files on kill (#1943) ...

Replaces direct fs.writeFileSync calls for STATE.md, ROADMAP.md, and
config.json with write-to-temp-then-rename so a process killed mid-write
cannot leave an unparseable truncated file. Falls back to direct write if
rename fails (e.g. cross-device). Adds regression tests for the helper.

Closes #1915

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-04-07 17:27:20 -04:00

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