feat: model finite cargo station handling and cancellation

docs/api.mdmodified+5-0

Changes to docs/api.md

		⋯61 linesShow the 61 lines above this hunk@@ -62,6 +62,11 @@ provides the separate [point-load intake prerequisite](cargo-delivery.md#point-l
62	62	It integrates real modeled mass/CG changes after one coincident inelastic point capture.
63	63	The caller still owns the parcel, finite station handling and captured fleet custody protocol.
64	64
	65	+`createCargoStationHandler(declaration)` in `cargo/station.ts` owns one existing point
	66	+through ballistic capture, finite rail transport, cancellation braking and a single
	67	+departure. See the [station model and integration limits](cargo-station.md). It does not
	68	+grant vehicle authority or confirm custody.
	69	+
65	70	## Target sources
66	71
67	72	`createGpsTargetSource({ targetId, origin, maxSpeedMps?, now? })` converts trusted phone or GNSS fixes