feat(queen): enhance PID file with heartbeat tracking + JSON state#543
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…splay - PID file now stores JSON with pid, started_at, heartbeat, restart_count - Backward-compatible readPidState() handles legacy plain-PID format - showStatus() displays heartbeat age (e.g. '5s ago') - updateHeartbeat() for periodic timestamp refresh - readPidState() parses JSON state for monitoring Refs #430
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Summary
Phase 1 of #430 — enhance queen daemon supervisor with proper PID tracking:
{"pid":12345,"started_at":1773945606,"heartbeat":1774273571,"restart_count":0}readPidState()handles both JSON and legacy plain-PID formatupdateHeartbeat()for periodic timestamp refresh (call from supervisor loop)showStatus()now displays heartbeat age (e.g. "5s ago")isSupervisorRunning()refactored to usereadPidState()Refs #430 (Phase 1: PID File + Health Tracking)