## 1. Streaming screenshot OCR

- [x] 1.1 Add a failing screenshot-client behavior test for an SSE response with prompt and image input.
- [x] 1.2 Route screenshot OCR through the shared Responses client and add multimodal message translation.

## 2. Non-streaming compatibility

- [x] 2.1 Add behavior coverage proving `Agent:UseStreaming=false` preserves non-streaming screenshot OCR and image input.
- [x] 2.2 Document that screenshot OCR inherits the agent streaming setting.

## 3. Verification

- [x] 3.1 Refactor the touched screenshot and shared client paths for DRYness, SOLID boundaries, and simplicity while preserving behavior.
- [x] 3.2 Run focused tests, the full solution tests, and strict OpenSpec validation.
- [x] 3.3 Restart Meeting Assistant only while idle and verify screenshot OCR against the deployed LiteLLM endpoint.