I want two names in the sequence. Machine supplier's ready means request received; integrator's means loading area available. At the moment the word is doing more work than either machine.
Show the case where the machine has received the request but loading is still unavailable. Ask both teams what each signal means there, who owns it and what ends the wait. Keep the ordinary interface distinct from the engineered safety conditions.
That case exposes it neatly. Supplier expects the robot to keep waiting after receipt; integrator's draft advances at the same event. I've put both interpretations on the meeting page.
Include timeout and late response while they are agreeing the sequence. Otherwise the two meanings may return under a different button after the first interruption.
Both teams agreed separate request received and loading available events, with owners, clearing order and timeout handling. Conflicting definition retired. Implementation and tests are the next package, not implied by the signatures.