Run `before_agent_finalize` for embedded agents before terminal delivery so revise decisions can retry without leaking a final assistant reply.
The embedded subscription now defers terminal assistant events, block replies, and lifecycle delivery until the pre-terminal gate resolves; accepted revise decisions suppress delivery, while hook failures and continue decisions finalize normally. It also preserves existing replay-invalid liveness behavior while still preventing revise after side-effecting turns.
Closes#87585
Co-authored-by: ai-hpc <mail.speedy.hpc@hotmail.com>
NVIDIAN
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