[Drones][M5.2] Verify structured notification, approval, and finalize flows across repos

[aron23]

Parent Milestone

[Drones][M5] Verify, document, and roll out the agent-first FaceTheory soul flow

Step

Verify the cross-repo interactions for notifications, message entry points, approvals, conversation outputs, and finalize behavior in the contracts that the rewritten client consumes.

Completion Criteria

• the cross-repo state transitions are verified end to end
• structured events and machine-readable artifacts are validated for client use
• failure cases are explicit enough for rollout decisions
• the parent milestone no longer depends on cross-repo behavior remaining untested