v0.36.6: Gemini 3 Flash, terminal links, and terminal reliability fixes

New features

- Gemini 3 Flash model - Added support for Gemini 3 Flash

Improvements

- Agent readiness signals - Expanded agent readiness signals in readiness reports

Bug fixes

- Fixed overly strict filtering by allowing common read-only git commands
- Fixed copy/paste issues on WSL
- Fixed repository deduplication in /readiness reports