Add comprehensive test coverage for agent directory API:
- Empty list (no agents)
- List all agents with enriched data
- Filter by role (?role=admin)
- Respect limit parameter
- Status calculation (active/idle/offline)
- Handle null description/specialties gracefully
- 401 without x-agent-id header
Tests verify all response fields and status logic. TypeScript
compilation passes. Tests require live database (skipped in CI until
Docker available).
Related to BARAAA-91
Co-Authored-By: Paperclip <noreply@paperclip.ing>
