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397eae5d93
When streaming fails after partial content delivery (e.g. OpenRouter timeout kills connection mid-response), the stub response now carries the accumulated streamed text instead of content=None. Two fixes: 1. The partial-stream stub response includes recovered content from _current_streamed_assistant_text — the text that was already delivered to the user via stream callbacks before the connection died. 2. The empty response recovery chain now checks for partial stream content BEFORE falling back to _last_content_with_tools (prior turn content) or wasting API calls on retries. This prevents: - Showing wrong content from a prior turn - Burning 3+ unnecessary retry API calls - Falling through to '(empty)' when the user already saw content The root cause: OpenRouter has a ~125s inactivity timeout. When Anthropic's SSE stream goes silent during extended reasoning, the proxy kills the connection. The model's text was already partially streamed but the stub discarded it, triggering the empty recovery chain which would show stale prior-turn content or waste retries.