Prepare for stable release 2025.12.09

- Remove all DEBUG print statements from AIAssistant plugin
- Update version to 2025.12.09 across all build files
  - src/cthulhu/cthulhuVersion.py
  - meson.build
  - distro-packages/Arch-Linux/PKGBUILD
- Add OCR optional dependencies to meson.build
  - pdf2image: PDF processing for OCR
  - scipy: Scientific computing for OCR analysis
  - webcolors: Color name resolution for OCR
- Add explicit OCR Python packages to PKGBUILD optdepends
  - python-pdf2image
  - python-scipy
  - python-webcolors
- Remove temporary test files from repository root
  - test_atspi_version.py
  - test_axtext_basic.py
  - test_modern_atspi_keystroke.py

All changes validated with successful local build.
Ready for final testing before stable release tag.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

meson.build

@@ -1,5 +1,5 @@
 project('cthulhu',
-  version: '2025.08.11',
+  version: '2025.12.09',
   meson_version: '>= 1.0.0',
 )
 
@@ -54,6 +54,9 @@ optional_modules = {
   'dasbus': 'D-Bus remote controller',
   'psutil': 'system information commands',
   'gi.repository.Wnck': 'mouse review',
+  'pdf2image': 'PDF processing for OCR',
+  'scipy': 'Scientific computing for OCR analysis',
+  'webcolors': 'Color name resolution for OCR',
 }
 
 summary = {}