- Added extension system support for Python execution events with new event types and handlers.
- Added Python mode theming and execution indicators across all theme files.
- Added `$` and `$$` command prefixes for Python execution in interactive mode.
- Changed Python tool to use cells array instead of single code parameter.
- Renamed workdir parameter to cwd in Bash and Python tools for consistency.
- Added 65 new built-in color themes including dark, light, and material variants.
- Added theme sync script to generate theme index from JSON files.
- Expanded default theme collection from approximately 30 to 96 themes.
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