Add model architecture coverage tests:
- VQA model family detection for 19 architectures
- Florence special prompts test (<OD>, <OCR>, <CAPTION>, etc.)
- Moondream detection features test
- VQA architecture capabilities test
- Tagger model types and WD version comparison tests
Improve test validation:
- Add is_meaningful_answer() to reject responses like "."
- Verify parameters have actual effect (not just accepted)
- Show actual output traces in PASS/FAIL messages
- Fix prefill tests to verify keep_prefill behavior
Add configurable timeout:
- Default timeout increased to 300s for slow models
- Add --timeout CLI argument for customization
Other improvements:
- Add JoyCaption to recognized model families
- Reduce BLIP models to avoid reloading large models
- Better detection result validation for annotated images
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