PR #31 merged: De-Stu the docs: generic paths + sixty-second quickstart

Prep for putting the engine in front of strangers:

• obs-setup.md: the recording path was hardcoded to ~/Code/tools/edator/recordings in three places. Now generic.
• README: new Sixty-second quickstart — one existing mp4, no plugin, no OBS: transcribe → minimal hand-written pack → validate → render. The example pack passes validate.js (semantic).
• README Requirements: documents the optional Python/OpenCV dep for face-tracked features (was only discoverable via the private studio's doctor script).

Deliberately untouched: roll-prep.mjs studio-shaped defaults (--out workspace/recordings) — they're overridable by flag and the private studio's vendored copy relies on them.

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