Add class descriptions for San Andreas

[Copilot]

• [x] Analyze current SA classes without descriptions (69 total classes)
• [x] Copy descriptions from GTA3/VC for common classes (45 classes)
• [x] Create custom descriptions for SA-specific classes (24 classes)
• [x] Update sa.json with all class descriptions
• [x] Verify build process generates properly
• [x] Test changes don't break existing functionality
• [x] Fix accidental games.json modification

Summary: All 69 classes in SA now have descriptions. 45 classes reuse descriptions from GTA3/VC for consistency, and 24 SA-specific classes have custom descriptions based on their functionality. The changes maintain compatibility and pass all validation tests.

Fixed: Reverted accidental modification to editor/games.json that was made during testing - this file should contain all games, not just SA.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Class descriptions for San Andreas</issue_title> <issue_description>classes section in sa.json lacks descriptions. currently the description can only be added locally by manual editing of the json file and committing to the repo

GTA III and VC already have brief descriptions for each class, e.g. https://github.com/sannybuilder/library/blob/master/gta3/gta3.json#L29414

can be used as an example</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes sannybuilder/library#54

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