motiscope: doctor

Verify dependencies and scaffold config. motiscope's pipeline is pure Python standard library, so the only hard dependencies are ffmpeg and ffprobe.

Resolve the scripts directory

SCRIPTS="${CLAUDE_PLUGIN_ROOT:-}/scripts"
[ -f "$SCRIPTS/mvsetup.py" ] || SCRIPTS="<absolute dir of this SKILL.md>/../../scripts"

(Windows: use python.)

Run status