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SubagentTruncatedReplyMiddleware()
EmptyTruncatedReplyMiddleware
Omit hook inputs from traces by default; set a TracePolicy to override.
TracePolicy
Return truncated subagent failures to the parent.
Raise when the reply was cut off before any output.
Keep partial subagent answers and fail empty ones for the parent to handle.
Replace the inherited parent guard in place when merging fork middleware.
