tools/video/green_screen_composite.py imports numpy at module level (and
declares "python:numpy" as a dependency), but numpy was missing from
requirements.txt. Because registry.discover() imports every tool module,
a fresh `make setup` followed by the mandatory preflight crashes with
ModuleNotFoundError: No module named 'numpy'. Add numpy>=1.24.
Also gitignore *.onnx/*.onnx.json so Piper TTS voice models fetched at
runtime (e.g. en_US-lessac-medium.onnx, ~60MB) aren't accidentally
committed to the repo root.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
