feat: coordinate modeled two-carrier cargo handover

docs/vehicles.mdmodified+5-0

Changes to docs/vehicles.md

		⋯100 linesShow the 100 lines above this hunk@@ -101,6 +101,11 @@ Modeled acknowledgements preserve capture time separately from delivery. An unce
101	101	result blocks progression and is never automatically retried as a new action. Recovery during a
102	102	pending action also blocks. These identities do not establish exactly-once delivery on hardware.
103	103
	104	+The opt-in quadcopter `material-receive` task adds a declared pad anchor and a bounded
	105	+wait for one correlated receipt. It enters with inhibited motor commands under qualified
	106	+surface contact. Its [interlocks and counted failure routes](cargo-delivery.md#receiving-mission-task-prerequisite)
	107	+are distinct from the still-pending mechanical-intake and fleet custody coordinator.
	108	+
104	109	Surface sounding reduction retains raw acoustic corrections, local datum, capture-pose estimator
105	110	and gyro epochs and declared position/attitude/clock uncertainty. It projects the beam footprint and
106	111	rejects unqualified capture timing or uncertainty below the sensor declaration. This is a modeled