Initial commit: organized project structure for student handoff

Reorganized flat 41-file directory into structured layout with:
- scripts/ for Python analysis code with shared config.py
- notebooks/ for Jupyter analysis notebooks
- data/ split into raw/, metadata/, processed/
- docs/ with analysis summary, experimental design, and bimodal hypothesis tutorial
- tasks/ with todo checklist and lessons learned
- Comprehensive README, PLANNING.md, and .gitignore

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

data/raw/README.md

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+# Raw Data
+
+SQLite databases containing fly tracking data from ethoscope recordings.
+
+## Files
+
+| File | Machine | Session | Size |
+|------|---------|---------|------|
+| `2025-07-15_16-03-10_076e...tracking.db` | ETHOSCOPE_076 | 16:03:10 | ~6.5MB |
+| `2025-07-15_16-03-27_145b...tracking.db` | ETHOSCOPE_145 | 16:03:27 | ~6.1MB |
+| `2025-07-15_16-31-34_076e...tracking.db` | ETHOSCOPE_076 | 16:31:34 | ~6.6MB |
+| `2025-07-15_16-31-41_145b...tracking.db` | ETHOSCOPE_145 | 16:31:41 | ~6.6MB |
+| `2025-07-15_16-32-05_268...tracking.db` | ETHOSCOPE_268 | 16:32:05 | ~7.0MB |
+
+**Note**: Machine 139 has metadata but no tracking database. See `docs/experimental_design.md`.
+
+## Schema
+
+Each database contains tables `ROI_1` through `ROI_6`:
+
+| Column | Type | Description |
+|--------|------|-------------|
+| `id` | int | Detection ID within frame |
+| `t` | int | Time in **milliseconds** from recording start |
+| `x` | float | X position in pixels |
+| `y` | float | Y position in pixels |
+| `w` | float | Bounding box width in pixels |
+| `h` | float | Bounding box height in pixels |
+| `phi` | float | Orientation angle |
+| `is_inferred` | int | Whether position was inferred (0/1) |
+| `has_interacted` | int | Whether interaction detected (0/1) |
+
+## Provenance
+
+Data recorded on 2025-07-15 using ethoscope platform.
+Resolution: 1920x1088 @ 25fps, H.264 28q quality.
+These files are gitignored (binary, ~33MB total).