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## Why Provider errors with code `model_not_found` should end the turn immediately and preserve the provider's message instead of triggering retries. ## What changed - Recognize `model_not_found` in HTTP 400, 403, and 404 responses and in streamed `error` and `response.failed` events. - Preserve the provider message and any available HTTP status, and expose `modelNotFound` through the app-server protocol and generated schemas and SDK types. ## Testing Add coverage for HTTP classification, statusless stream errors, and terminal failures without retries across HTTP, SSE, and WebSocket responses. Verify that `thread/read` preserves the error reported by the live notification. GitOrigin-RevId: 88f824ac03c8c9669915b1e40c67b76c08326fbe