feat: Phase 2 — session monitor, lifecycle, watcher manager
Phase 2 (Session Monitor + Lifecycle):
- src/session-monitor.js: polls sessions.json every 2s for new/ended sessions
- Detects agents via transcriptDir subdirectory scan
- Resolves channelId/rootPostId from session key format
- Emits session-added/session-removed events
- Handles multi-agent environments
- Falls back to defaultChannel for non-MM sessions
- src/watcher-manager.js: top-level orchestrator
- Starts session-monitor, status-watcher, health-server
- Creates/updates Mattermost status posts on session events
- Sub-agent linking: children embedded in parent status
- Offset persistence (save/restore lastOffset on restart)
- Post recovery on restart (search channel history for marker)
- SIGTERM/SIGINT graceful shutdown: mark all boxes interrupted
- CLI: node watcher-manager.js start|stop|status
- MAX_ACTIVE_SESSIONS enforcement
Integration tests:
- test/integration/session-monitor.test.js: 14 tests
- Session detection, removal, multi-agent, malformed JSON handling
- test/integration/status-watcher.test.js: 13 tests
- JSONL parsing, tool_call/result pairs, idle detection, offset recovery
All 86 tests pass (59 unit + 27 integration). make check clean.
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