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## Why HTTP 400 responses with `context_length_exceeded` need to reach context-window recovery so manual compaction can retry with less history. Streaming context-window failures should end the stream immediately. ## What changed - Map `context_length_exceeded` through the shared terminal provider error parser for HTTP 400 responses and events without an HTTP status. - Return SSE context-window failures immediately. - Preserve retryable handling for WebSocket errors carrying HTTP 503, even when their code is `context_length_exceeded`. ## Testing Add coverage for WebSocket status handling and immediate SSE termination with retry headers. Update the manual compaction test to verify recovery from an HTTP 400 context-window error by dropping one history item and retrying. GitOrigin-RevId: 56d8c831c2fad2ca1318318a3b4258fcc516d689