fix: resolve 15 bugs and gaps in video scraper pipeline

- Fix extract_visual_data returning 2-tuple instead of 3 (ValueError crash)
- Move pytesseract from core deps to [video-full] optional group
- Add 30-min timeout + user feedback to video enhancement subprocess
- Add scrape_video_impl to MCP server fallback import block
- Detect auto-generated YouTube captions via is_generated property
- Forward --vision-ocr and --video-playlist through create command
- Fix filename collision for non-ASCII video titles (fallback to video_id)
- Make _vision_used a proper dataclass field on FrameSubSection
- Expose 6 visual params in MCP scrape_video tool
- Add install instructions on missing video deps in unified scraper
- Update MCP docstring tool counts (25→33, 7 categories)
- Add video and word commands to main.py docstring
- Document video-full exclusion from [all] deps in pyproject.toml
- Update parser registry test count (22→23 for video parser)

All 2437 tests passing, 0 failures.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/skill_seekers/cli/main.py

@@ -12,6 +12,8 @@ Commands:
     scrape               Scrape documentation website
     github               Scrape GitHub repository
     pdf                  Extract from PDF file
+    word                 Extract from Word (.docx) file
+    video                Extract from video (YouTube or local)
     unified              Multi-source scraping (docs + GitHub + PDF)
     analyze              Analyze local codebase and extract code knowledge
     enhance              AI-powered enhancement (auto: API or LOCAL mode)