- Add openapi.json spec covering all 59 API routes (~95 operations)
- Serve spec at GET /api/docs (no auth required, cached)
- Add interactive Scalar API reference UI at /docs
- Allow unauthenticated access to /api/docs and /docs in middleware
- Add @scalar/api-reference-react dependency
- Add 3 E2E tests for spec validation and auth bypass
- Add `agents` field to tokens action=stats response (groups by agent
extracted from sessionId split on ':')
- Add new action=agent-costs returning per-agent stats, model breakdown,
session list, and daily cost/token timeline
- New AgentCostPanel with summary cards, pie chart, trend lines,
efficiency bars, and expandable ranking table
- Add nav-rail entry in OBSERVE group after Tokens
- Add ContentRouter case for agent-costs tab
- Add 5 E2E tests for the new API endpoints
Nyk