Initial scaffold: capture + vision modules with detect CLI

- capture/: frame sampling at configurable fps, ffmpeg audio extraction (WAV, whisper-ready)
- vision/: changed-pixel motion scoring, stable/moving segmentation, contour + perspective document detection, Laplacian sharpness scoring, optional CLAHE enhancement
- pipeline: two-pass detect (motion timeline, then best-frame crop per stable window) writing crops, debug frames, report.json, and motion_scores.csv
- CLI: probe / detect / extract-audio subcommands
- config.yaml with tunable thresholds; placeholder packages for events, transcribe, ocr, naming, pdf, review_cli
- synthetic sample video generator + 16 unit tests

.gitignore

@@ -0,0 +1,16 @@
+__pycache__/
+*.py[cod]
+.venv/
+venv/
+.pytest_cache/
+.mypy_cache/
+*.egg-info/
+
+# Runtime artifacts
+output/
+sample_data/videos/*.mp4
+sample_data/videos/*.mov
+!sample_data/videos/.gitkeep
+*.wav
+
+.DS_Store