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>

uv.lock

@@ -5983,7 +5983,6 @@ dependencies = [
     { name = "pygithub" },
     { name = "pygments" },
     { name = "pymupdf" },
-    { name = "pytesseract" },
     { name = "python-dotenv" },
     { name = "pyyaml" },
     { name = "requests" },
@@ -6084,6 +6083,7 @@ video-full = [
     { name = "easyocr" },
     { name = "faster-whisper" },
     { name = "opencv-python-headless" },
+    { name = "pytesseract" },
     { name = "scenedetect", extra = ["opencv"] },
     { name = "youtube-transcript-api" },
     { name = "yt-dlp" },
@@ -6164,7 +6164,7 @@ requires-dist = [
     { name = "pygithub", specifier = ">=2.5.0" },
     { name = "pygments", specifier = ">=2.19.2" },
     { name = "pymupdf", specifier = ">=1.24.14" },
-    { name = "pytesseract", specifier = ">=0.3.13" },
+    { name = "pytesseract", marker = "extra == 'video-full'", specifier = ">=0.3.13" },
     { name = "python-docx", marker = "extra == 'all'", specifier = ">=1.1.0" },
     { name = "python-docx", marker = "extra == 'docx'", specifier = ">=1.1.0" },
     { name = "python-dotenv", specifier = ">=1.1.1" },