- Add low-key rectangular capture button overlay to MainActivity
(semi-transparent black with white stroke, consumes touch events)
- Run capture() off UI thread via cameraExecutor to avoid ANR
- Add .gitmodules for go-scicam and web-scicam clients
- Add AGENTS.md with build, API, and architecture notes
- Add scicam_api_test.sh for manual API validation
- Ignore scicam_capture_base64.txt and .env