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Kyle Carberry
2abe55549c
When a chatd server shuts down (`Close()`), the server context is canceled. Previously, in-flight chats would be marked as `error` because the `context.Canceled` error was not distinguished from actual processing failures. This adds `isShutdownCancellation()` to detect when the error is caused by the server context being canceled (as opposed to a chat-specific cancellation like `ErrInterrupted`). When detected, the chat status is set to `pending` with no `last_error`, allowing another replica to pick it up and retry. Extracted from #22440 — only the context cancellation bug fix, no chattest changes.