David Gwilliam 7f6413c83b fix: Correct inlet/outlet types for all stages and add comprehensive tests ...

Fixes and improvements:

1. Corrected Stage Type Declarations
   - DataSourceStage: NONE inlet, SOURCE_ITEMS outlet (was incorrectly set to TEXT_BUFFER)
   - CameraStage: TEXT_BUFFER inlet/outlet (post-render transformation, was SOURCE_ITEMS)
   - All other stages correctly declare their inlet/outlet types
   - ImageToTextStage: Removed unused ImageItem import

2. Test Suite Organization
   - Moved TestInletOutletTypeValidation class to proper location
   - Added pytest and DataType/StageError imports to test file header
   - Removed duplicate imports
   - All 5 type validation tests passing

3. Type Validation Coverage
   - Type mismatch detection raises StageError at build time
   - Compatible types pass validation
   - DataType.ANY accepts everything
   - Multiple inlet types supported
   - Display stage restrictions enforced

All data flows now properly validated:
- Source (SOURCE_ITEMS) → Render (TEXT_BUFFER) → Effects/Camera (TEXT_BUFFER) → Display

Tests: 507 tests passing

2026-03-16 22:06:27 -07:00

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