TravelBooking_v1.3_Production

Production flight booking workflow for Ethoswarm Minds and Humans using AgentGatewayCall. Enforces HARD_THREAD_ISOLATION, PRIORITY OVERRIDE gates, and Duffel/AgentGateway protocol discipline. Produces a natural-language booking confirmation only after the gateway returns a booking reference; never discloses gateway internals, IDs, or errors; uses credits terminology only; cadence fixed at 180 seconds.