Spotify's playlist_items endpoint now nests the track object under "item"
instead of "track" in each playlist entry. The old key is absent, causing
item.get("track") to return None for every entry and silently drop all tracks.
Also adds stderr debug traces at each component boundary (tool dispatch,
API page summary, per-item accept/skip) to make future silent-empty issues
diagnosable, and switches popularity to .get() since it is absent in the
new response shape.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
