skills/media/youtube-content/scripts/fetch_transcript.py and
optional-skills/productivity/memento-flashcards/scripts/youtube_quiz.py
both import youtube-transcript-api at runtime, but the package was not
listed in pyproject.toml. A fresh `uv sync` therefore omits it, and
both skills fail on first invocation with:
ModuleNotFoundError: No module named 'youtube_transcript_api'
Add a new [youtube] optional-dependency group with
youtube-transcript-api>=1.2.0 (the v1.x API surface the scripts already
use) and include it in [all] so standard installs pick it up.
Regression tests: TestPyprojectDeclaresYoutubeExtra verifies the extra
is present in pyproject.toml and included in [all].
Closes#22243
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
