Implement optional single-image intake, Signal ingestion, and multimodal vision analysis

- Add image intake service with format validation (JPEG, PNG, WebP) and EXIF/GPS stripping
- Enforce strict single-image rule across Web and Signal attachment channels
- Implement token-optimized vision downscaling and JPEG compression
- Add IMAGE_CONTEXT pipeline stage with OmniRoute vision routing and resilient failover
- Seed and manage versioned idea-image-interpreter prompt in catalog
- Update Web UI with responsive image picker, preview chip, and Visual Context tab
- Add comprehensive automated test suite in test_image_intake.py
- Update README and Labyricorn devlog

.gitignore

@@ -6,3 +6,20 @@ __pycache__/
 data/
 scratch/
 .env
+*.db
+thinkstorm.db
+
+# IDE & shell runtime
+.antigravity-ide-server/
+.gemini/
+.cache/
+.ssh/
+.bash_history
+.lesshst
+.bashrc
+.profile
+
+# Scratch setup scripts
+apply_opengist_oauth.py
+configure_opengist.py
+inspect_opengist.py