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Ethan
7e2f7198dd
Replaces the 60 second first-token timeout in the chat loop with a 10 minute stream-silence timeout. Previously, the guard bounded only the gap before the first stream part. Once any part arrived the attempt could hang indefinitely if the provider stopped streaming without closing the connection, and even normal long-running responses could be killed after 60 seconds if the provider was slow to emit the first token. The guard now arms when a model attempt opens its stream, resets on every received stream part, and fires after 10 minutes of complete silence. The existing retry path still handles the timeout, and the public `startup_timeout` error kind is preserved to avoid API and frontend churn. 10 minutes matches the default request timeout used by the Anthropic and OpenAI Python SDKs. Closes CODAGT-493