zhi 6c0959f5bb BE-AGT-001: implement heartbeat pending-slot query service ...

- New service: app/services/agent_heartbeat.py
- get_pending_slots_for_agent(): queries today's NotStarted/Deferred slots
  where scheduled_at <= now, sorted by priority descending
- get_pending_slot_count(): lightweight count-only variant
- Auto-materializes plan virtual slots for today before querying
- Supports injectable 'now' parameter for testing

2026-03-31 23:01:47 +00:00

3.8 KiB

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