STORY:
The session backend needed to aggregate agent health from a live
telemetry stream rather than static bead metadata. This refactor
makes liveness signals real-time and accurate.
COLLABORATION:
We extended the ActivityEvent model with a native 'heartbeat' kind,
updated extendActivityLease() to emit through the activity bus, and
refactored getAgentLivenessMap() to prioritize heartbeat activity
history over stale bead metadata.
DELIVERABLES:
- ActivityEvent extended with 'heartbeat' kind
- extendActivityLease() emits heartbeats through activity bus
- getAgentLivenessMap() prefers telemetry over static metadata
- Registry APIs support projectRoot injection for testing
- Tests verify preference logic via TDD
VERIFICATION:
- 93/93 tests PASSING
- Heartbeat override verified in isolated temp projects
CLOSES: bb-buff.1.3
BLOCKS: bb-buff.3.2, bb-buff.3.3, bb-buff.2.1
Today we reached a major architectural conclusion: project history shouldn't be stored, it should be derived. We rejected the overhead of a separate SQLite event store in favor of an O(N) snapshot-diffing engine that computes human-readable narratives directly from the issues.jsonl source of truth.
Key Triumphs:
- Implemented O(N) diffing algorithm in src/lib/snapshot-differ.ts that transforms raw JSONL into 16 distinct social event types.
- Engineered a file-based persistence layer (src/lib/activity-persistence.ts) to solve the 'Next.js HMR Wiped My Memory' bug, ensuring project heartbeat survives server restarts.
- Developed the agent-session data model that unifies Beads, Activity, and Cross-Agent Mail into a single 'Mission' context.
Raw Honest Moment:
We struggled for over an hour with 'missing history' before realizing that development-mode reloads were purging our in-memory buffers. The shift to a file-backed ring buffer was a reactive pivot that became a core project strength.
