## Changes
- **CheckForUpdatesJob**: Add triple version comparison (CDN vs cache vs running)
- Never allows version downgrade from currently running version
- Uses data_set() for safer nested array mutation
- Prevents incorrect new_version_available flag setting
- **UpdateCoolify**: Add cache validation before fallback
- Validates cache against running version on CDN failure
- Throws exception if cache is corrupted/older than running
- Applies to both manual and automated updates
- **Tests**: Add comprehensive test coverage
- tests/Unit/CheckForUpdatesJobTest.php (5 tests)
- tests/Unit/UpdateCoolifyTest.php (3 tests)
## Impact
- Prevents all downgrade scenarios (CDN rollback, corrupted cache, etc.)
- Maintains backward compatibility
- Provides clear logging for debugging
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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