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Five findings from a fifth (final scoped) max-effort review of the previous commit, all local: 1. writeConfig now writes atomically (pid-suffixed temp file + renameSync — rename within one directory is atomic on POSIX). This closes the real hazard behind the review's torn-read finding: readConfig's corrupted-file catch RESETS the config to defaults (telemetry re-enabled, anonymousId rotated, trial fields wiped), so a concurrent reader catching a non-atomic write mid-flight would silently destroy the user's config — and the previous commit's per-render readConfigFresh() at the arm site multiplied exposure to exactly that window. Verified against a real filesystem, not just the mocked unit tests. 2. writeConfig now returns whether the write landed (errors still swallowed — telemetry must never break the CLI). persistDeParallelRouterTrialFired uses it to stop immediately on a genuine fs failure (retrying an unwritable file is pointless) and reserve its retries for actual concurrent clobbers, instead of 3 blind write attempts + 4 disk reads. 3. The persistence-failure console.warn is now !quiet-gated like every other trial message — a quiet/batch-json render on an unwritable ~/.hyperframes no longer emits unexpected stderr that CI wrappers asserting empty stderr would misread as a render failure. The in-process latch already guarantees the safety behavior whether or not the warning prints. 4. The arm site short-circuits on the in-process fired latch BEFORE the fresh config read — post-fired batch rows no longer pay a per-row config read + parse + shared-cache invalidation for an answer module state already knows. 5. Replaced the new `as T` assertions in render.test.ts's config-state factory with an explicitly typed vi.hoisted return (repo TypeScript convention: no `as T`). config.test.ts: node:fs mock gains renameSync (faithful to the new atomic write); new test covers the success/failure return and asserts no temp file survives a write. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>