Why: F10 - any handler error became a no-side-effect rejected receipt
and an audit-store failure dropped the generated operation ID, losing
the reconciliation handle and inviting unsafe retries.
Evidence: cmdbus tests pass (verify-u7b.json); post-execution-unknown,
audit-failure-keeps-ID and confirmation-idempotency cases added.
Impact: unknown receipts now carry the trusted operation ID via the
U7A constructor; rejected stays ID-free; no auto-replay anywhere.
Refs: feature/agent-stack-audit-remediation-b1 U7B
weichen
agent-exec-transport