Fix parallel tool handoff reply race - #7075
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Summary
Fixes #5150
Problem
When one parallel tool returned an
Agentand a sibling returned a reply-producing value, the outgoing activity could generate another response after initiating the handoff. That response could win the drain race, leaving the replacement agent inactive. A handoff result could also be overwritten when it appeared before a non-handoff result in the output batch.The realtime path had the same ordering issue. It could additionally sync outputs to an outgoing session with automatic tool replies or schedule a local reply. The handoff now takes precedence in both paths while completed tool results remain recorded locally.
Verification
make check