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7c2f71315b
Mirror the previous commit's `writeBridgeAtomic` fix on the
companion `writeWarnState` in `ecc-context-monitor.js`. Same shape:
fixed `${target}.tmp` → `${target}.${process.pid}.${randomNonce}.tmp`,
plus best-effort cleanup of the tmp file on `renameSync` failure
(throws original error after cleanup).
`writeWarnState` debounces the context-monitor's threshold alarms
(`COST_NOTICE_USD`, `COST_WARNING_USD`, `COST_CRITICAL_USD`, plus the
context-remaining and loop-detection ones). Without unique suffixes,
two PostToolUse subprocesses racing on the warn-state file produce
either a corrupted JSON debounce-state on disk or an ENOENT throw
that the hook catches and swallows — either way the next warn-state
read returns the default `{callsSinceWarn: 0, lastSeverity: null}`
and the threshold alarms re-fire or stop firing erratically. Users
see warning messages flicker or vanish; debounce no longer works.
Three call sites in this repo now share the same atomic-write
contract:
- `writeBridgeAtomic` (scripts/lib/session-bridge.js) — primary
- `writeCostWarningIfChanged` (scripts/hooks/ecc-metrics-bridge.js) — cost cache
- `writeWarnState` (this file) — debounce state
`yarn lint` clean. Regression test covering both `writeBridgeAtomic`
and `writeWarnState` under concurrent load lands in the next commit.