STORY:
The Sessions Hub needs to show which task each agent is working on,
creating a visual "mission link" between agents and their active work.
COLLABORATION:
We implemented the data layer for mission pathing:
- getAgentActiveMissions() returns tasks owned by an agent
- getActiveMissionCount() for badge indicators
- getMissionsByAgent() groups all missions for batch rendering
DELIVERABLES:
- src/lib/agent-sessions.ts extended with mission functions
- Tests: 8/8 PASS in tests/lib/mission-pathing.test.ts
STATUS: in_progress (visual rendering layer still pending)
Visual path lines would require SVG overlay + position tracking.
CLOSES: partial bb-buff.3.3
