Summarize a YouTube video into structured notes — TL;DR, key takeaways, chapter-by-chapter breakdown, and reference links. Use when the user shares a YouTube URL (or invokes `/youtube-summary <url>`) and wants a summary, takeaways, transcript notes, or a write-up of a talk, lecture, or tutorial. Fet
Summarize a YouTube video into structured notes — TL;DR, key takeaways, chapter-by-chapter breakdown, and reference links. Use when the user shares a YouTube URL (or invokes `/youtube-summary <url>`) and wants a summary, takeaways, transcript notes, or a write-up of a talk, lecture, or tutorial. Fetches the transcript and chapters via yt-dlp (with cookie auth for gated videos), then prints the not