This commit fixes 4 production bugs found via edge case testing:
1. BUG: System allowed assigning issues to terminated agents
- Added validation in issue creation endpoint
- Added validation in issue update endpoint
- Added validation in issue assign endpoint
2. BUG: Issues remained orphaned when agent was terminated
- Agent termination now auto-unassigns all issues from that agent
These bugs could lead to issues being assigned to non-functional agents
that would never work on them, causing work to stall silently.
Tests added in tests/api/routes/syndarix/test_edge_cases.py to verify:
- Cannot assign issue to terminated agent (3 variations)
- Issues are auto-unassigned when agent is terminated
- Various other edge cases (sprints, projects, IDOR protection)
Coverage: 88% → 93% (1830 tests passing)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
