DCC decides. Shuttleya continues. Argo gets booked.

DCC resolves the macro transportation question first. When the right answer is the Argo shuttle, Shuttleya receives the handoff with canonical decision context and continues the booking without resetting the traveler.

1. DCC routes the traveler into the Argo corridor.
2. Shuttleya locks the ride type and captures the date, pickup, and rider details.
3. The Argo request is submitted with the original DCC handoff attached.
4. DCC receives the lead signal back through the Shuttleya callback loop.