feat(orchestrator): Agent lifecycle management in reconciliation loop

[AlexMikhalev]

Summary

Wire reconciliation loop with agent lifecycle management:

• Periodic tick (30s default, configurable) in select! loop
• Agent exit detection via try_wait()
• Safety agent auto-restart with cooldown (60s default) and max-restart cap (10 default)
• Cron schedule checking for Core agents
• Output event draining to nightwatch for drift detection
• Periodic nightwatch.evaluate() calls

Config additions

• restart_cooldown_secs (default: 60)
• max_restart_count (default: 10)
• tick_interval_secs (default: 30)

Commits

• a6d81e9 feat(orchestrator): add lifecycle config fields with serde defaults and tests
• 9a2bfa7 feat(orchestrator): add output_rx to ManagedAgent and lifecycle tracking fields
• c3235f6 feat(orchestrator): wire reconciliation loop with lifecycle management

Tests

7 new tests: exit detection, restart cooldown, max restart cap, core agent no-restart, output event drain, full reconcile_tick cycle.

All 53 orchestrator tests + 32 spawner tests pass.

Deployed

Binary deployed to bigbox, verified reconciliation loop fires correctly with Safety agent spawn, drift detection, and alert handling.

[AlexMikhalev]

Implemented and deployed. All tests pass, verified on bigbox.