Stream that ends cleanly mid-response is now treated as a dropped connection (StreamTruncatedError)

Claude's replies arrive as a stream, a piece at a time. If that stream closes normally but before the reply is complete, Claude Code now treats it as a dropped connection. This covers a stream that ends in the middle of a content block, or ends without a final stop signal. You see "Connection closed before the response finished", and the error is on the list of network errors that are retried.

A second new error covers a malformed stream, where an update points at a content block that does not exist or has already closed. Stream-failure telemetry gains the reasons stream_truncated and malformed_stream.