* Fix zombie process accumulation (Issue #737)
Problem: Claude haiku subprocesses spawned by the SDK weren't terminating
properly, causing zombie process accumulation (user reported 155 processes
consuming 51GB RAM).
Root causes:
1. SDK's SpawnedProcess interface hides subprocess PIDs
2. deleteSession() didn't verify subprocess exit
3. abort() was fire-and-forget with no confirmation
4. No mechanism to track or clean up orphaned processes
Solution:
- Add ProcessRegistry module to track spawned Claude subprocesses
- Use SDK's spawnClaudeCodeProcess option to capture PIDs via custom spawn
- Pass signal parameter to enable AbortController integration
- Wait for subprocess exit in deleteSession() with 5s timeout
- Escalate to SIGKILL if graceful exit fails
- Add orphan reaper running every 5 minutes as safety net
Files changed:
- src/services/worker/ProcessRegistry.ts (new): PID registry and reaper
- src/services/worker/SDKAgent.ts: Use custom spawn to capture PIDs
- src/services/worker/SessionManager.ts: Verify subprocess exit on delete
- src/services/worker-service.ts: Start/stop orphan reaper
Fixes#737
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
* fix: address code review feedback
- Replace busy-wait polling with event-based proc.once('exit')
- Detect and warn about multiple processes per session (race condition)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Co-authored-by: bigphoot <bigphoot@gmail.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Alexander Knigge