- fetchEvents no longer reverses results (after= returns ASC)
- Watcher removes client-side id filtering (server handles it)
- Updated test mock to match ASC order
- Add discovery config with agentId and optional eventTypes filtering
- Add fetchEvents method to OGraphClient for event stream access
- Update Watcher to support both projection and event stream modes
- Update Scheduler to format event stream messages appropriately
- Add comprehensive tests for event stream diff logic and API client
- Maintain backward compatibility with existing projection mode
- Support OGRAPH_AGENT_ID environment variable override
This enables P0 Task system to discover changes from event streams
without requiring Projection fixes (#19). Event stream mode activated
when config.discovery is present, otherwise falls back to projection mode.
