Add project files, tests, and documentation for GitHub release

- CLI with visible, invisible, all, metadata, and batch commands
- Gemini watermark removal via reverse alpha blending
- Invisible watermark removal via diffusion regeneration (SynthID, TreeRing)
- AI metadata stripping (EXIF, PNG text, C2PA)
- Face protection (YOLO/Haar) and analog humanizer
- 137 tests covering all CLI modes and core engines
- Ruff and Pyright clean

.gitignore

@@ -0,0 +1,29 @@
+# Dependencies
+.venv/
+__pycache__/
+*.egg-info/
+dist/
+build/
+
+# Environment secrets
+.env
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# Test results
+data/results/
+
+# Reference materials
+_refs/
+
+# Downloaded model weights
+yolov8n.pt
+.coverage