- Update USAGE_TRACKING.md with new tier limits (50, 200, 1000, unlimited)
- Update AI_INTEGRATION.md with new tier limits
- Add note that limits are loaded from config (ai_calls_per_day)
- Document GET /api/v1/usage endpoint
- Update examples to show is_unlimited field
- Fix test examples with correct limit values
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
