- Upgraded OpenAPI spec from 3.0.3 to 3.1.0
- Replaced QueueItem oneOf pattern with prefixItems for precise tuple validation
- Simplified GitHub Actions workflow to use only Python tests (removed redundant swagger-editor validation)
- All validation now handled by openapi-spec-validator which supports OpenAPI 3.1
- QueueItem now enforces exact tuple structure: [position, prompt_id, prompt, extra_data, outputs_to_execute]