Add youtube transcript collection skill:

Co-authored-by: UfukNode <ufuk@crivacy.io>

skills/media/youtube-content/SKILL.md

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+---
+name: youtube-content
+description: Fetch YouTube video transcripts and transform them into structured content (chapters, summaries, threads, blog posts).
+---
+
+# YouTube Content Tool
+
+Extract transcripts from YouTube videos and convert them into useful formats.
+
+## Setup
+
+```bash
+pip install youtube-transcript-api
+```
+
+## Helper script
+
+This skill includes `fetch_transcript.py` — use it to fetch transcripts quickly:
+
+```bash
+# JSON output with metadata
+python3 SKILL_DIR/scripts/fetch_transcript.py "https://youtube.com/watch?v=VIDEO_ID"
+
+# With timestamps
+python3 SKILL_DIR/scripts/fetch_transcript.py "https://youtube.com/watch?v=VIDEO_ID" --timestamps
+
+# Plain text output (good for piping into further processing)
+python3 SKILL_DIR/scripts/fetch_transcript.py "https://youtube.com/watch?v=VIDEO_ID" --text-only
+
+# Specific language with fallback
+python3 SKILL_DIR/scripts/fetch_transcript.py "https://youtube.com/watch?v=VIDEO_ID" --language tr,en
+
+# Timestamped plain text
+python3 SKILL_DIR/scripts/fetch_transcript.py "https://youtube.com/watch?v=VIDEO_ID" --text-only --timestamps
+```
+
+`SKILL_DIR` is the directory containing this SKILL.md file.
+
+## URL formats supported
+
+The script accepts any of these formats (or a raw 11-character video ID):
+
+- `https://www.youtube.com/watch?v=VIDEO_ID`
+- `https://youtu.be/VIDEO_ID`
+- `https://youtube.com/shorts/VIDEO_ID`
+- `https://youtube.com/embed/VIDEO_ID`
+- `https://youtube.com/live/VIDEO_ID`
+
+## Output formats
+
+After fetching the transcript, format it based on what the user asks for:
+
+- **Chapters**: Group by topic shifts, output timestamped chapter list (`00:00 Introduction`, `03:45 Main Topic`, etc.)
+- **Summary**: Concise 5-10 sentence overview of the entire video
+- **Chapter summaries**: Chapters with a short paragraph summary for each
+- **Thread**: Twitter/X thread format — numbered posts, each under 280 chars
+- **Blog post**: Full article with title, sections, and key takeaways
+- **Quotes**: Notable quotes with timestamps
+
+## Workflow
+
+1. Fetch the transcript using the helper script
+2. If the transcript is very long (>50K chars), summarize in chunks
+3. Transform into the requested output format using your own reasoning
+
+## Error handling
+
+- **Transcript disabled**: Some videos have transcripts turned off — tell the user
+- **Private/unavailable**: The API will raise an error — relay it clearly
+- **No matching language**: Try without specifying a language to get whatever's available
+- **Dependency missing**: Run `pip install youtube-transcript-api` first