Record original-alignment implementation and traceability checkpoint

Capture current source, content data, tests, asset licenses, and original-specification traceability. Original implementation remains incomplete. The accepted matching UI generation passed 154 suites and 12,253 checks, with eight rendered staff-contract screens reviewed. Latest native Windows and full-original acceptance remain outstanding.

scripts/transport/elevator_service.gd

@@ -174,6 +174,34 @@ func request_trip(actor_id: StringName, from: Vector3i, to: Vector3i, minute: in
 	return {&"ok": true, &"replay": false, &"trip": trip.duplicate(true)}
 
 
+## Reserve two real seats atomically; no synthetic passenger or hidden capacity.
+func request_pair(first: StringName, second: StringName, from: Vector3i, to: Vector3i,
+	minute: int, access: Array[StringName] = []) -> Dictionary:
+	if first.is_empty() or second.is_empty() or first == second:
+		return _failure(&"INVALID_PAIR", "Two distinct passengers are required.")
+	if _trips.has(first) or _trips.has(second):
+		if _trips.has(first) and _trips.has(second) and _trips[first].get(&"companion_id", &"") == second and _trips[second].get(&"companion_id", &"") == first and _trips[first][&"from"] == from and _trips[first][&"to"] == to:
+			return {&"ok": true, &"replay": true, &"trip": _trips[first].duplicate(true)}
+		return _failure(&"ACTOR_ALREADY_TRAVELLING", "Pair member already owns another trip.")
+	var path_before := _path.create_snapshot()
+	var sequence_before := _sequence
+	var a := request_trip(first, from, to, minute, access)
+	if not a[&"ok"]:
+		_path.restore_snapshot(path_before)
+		_sequence = sequence_before
+		return a
+	var b := request_trip(second, from, to, minute, access)
+	if not b[&"ok"] or _shafts[_trips[first][&"shaft_id"]][&"config"][&"capacity"] < 2:
+		_path.restore_snapshot(path_before)
+		_trips.erase(first)
+		_trips.erase(second)
+		_sequence = sequence_before
+		return _failure(&"PAIR_REJECTED", "Both passengers must fit in the same cabin queue.")
+	_trips[first][&"companion_id"] = second
+	_trips[second][&"companion_id"] = first
+	return {&"ok": true, &"replay": false, &"trip": _trips[first].duplicate(true)}
+
+
 func advance_one_minute(minute: int) -> Array[Dictionary]:
 	var arrivals: Array[Dictionary] = []
 	if minute == _minute: return arrivals
@@ -206,6 +234,22 @@ func get_actor_trip(actor_id: StringName) -> Dictionary:
 
 
 func cancel_actor(actor_id: StringName) -> bool:
+	var partner: StringName = _trips.get(actor_id, {}).get(&"companion_id", &"")
+	if not partner.is_empty():
+		if _trips[actor_id][&"state"] == PathService.ELEVATOR_REQUEST_BOARDED:
+			last_error = "An onboard pair must alight together at a real landing."
+			return false
+		var path_before := _path.create_snapshot()
+		var trips_before := _trips.duplicate(true)
+		if not _cancel_single(actor_id) or not _cancel_single(partner):
+			_path.restore_snapshot(path_before)
+			_trips = trips_before
+			return false
+		return true
+	return _cancel_single(actor_id)
+
+
+func _cancel_single(actor_id: StringName) -> bool:
 	if not _trips.has(actor_id): return true
 	var trip: Dictionary = _trips[actor_id]
 	if trip[&"state"] == PathService.ELEVATOR_REQUEST_BOARDED:
@@ -259,8 +303,9 @@ func _apply_operational(shaft_id: StringName, operational: bool, minute: int) ->
 			# landing; movement remains held and requests remain owned.
 			car[&"operational"] = false
 			for actor_id: StringName in _names(_trips):
+				if not _trips.has(actor_id): continue
 				var waiting: Dictionary = _trips[actor_id]
-				if waiting[&"shaft_id"] == shaft_id and waiting[&"state"] == PathService.ELEVATOR_REQUEST_QUEUED and cancel_actor(actor_id):
+				if waiting[&"shaft_id"] == shaft_id and waiting[&"state"] == PathService.ELEVATOR_REQUEST_QUEUED and _cancel_single(actor_id):
 					arrivals.append({&"actor_id": actor_id, &"request_id": waiting[&"request_id"], &"cell": waiting[&"from"], &"emergency": false, &"cancelled": true})
 			_publish_cabin(car)
 			return arrivals
@@ -364,7 +409,11 @@ func restore_snapshot(snapshot: Dictionary) -> bool:
 	for value: Variant in snapshot[&"trips"]:
 		if not value is Dictionary: return _invalid("Elevator trip must be a Dictionary.")
 		var trip: Dictionary = value
-		if not _exact_keys(trip, [&"actor_id", &"request_id", &"shaft_id", &"connector_id", &"from", &"to", &"enqueued_at", &"state"]):
+		var keys: Array = [&"actor_id", &"request_id", &"shaft_id", &"connector_id", &"from", &"to", &"enqueued_at", &"state"]
+		if trip.has(&"companion_id"):
+			if not (trip[&"companion_id"] is String or trip[&"companion_id"] is StringName) or String(trip[&"companion_id"]).is_empty(): return _invalid("Invalid companion identity.")
+			keys.append(&"companion_id")
+		if not _exact_keys(trip, keys):
 			return _invalid("Elevator trip fields are invalid.")
 		for key: StringName in [&"actor_id", &"request_id", &"shaft_id", &"connector_id", &"state"]:
 			if not (trip[key] is String or trip[key] is StringName) or str(trip[key]).is_empty(): return _invalid("Elevator trip names are invalid.")
@@ -395,6 +444,15 @@ func restore_snapshot(snapshot: Dictionary) -> bool:
 			if not found: return _invalid("Queued trip details disagree with Path queue.")
 		else: return _invalid("Unknown elevator trip state.")
 		next_trips[actor_id] = trip.duplicate(true)
+	for actor_id: StringName in next_trips:
+		var trip: Dictionary = next_trips[actor_id]
+		var partner: StringName = trip.get(&"companion_id", &"")
+		if partner.is_empty(): continue
+		if partner == actor_id or not next_trips.has(partner): return _invalid("Missing companion trip.")
+		var other: Dictionary = next_trips[partner]
+		if other.get(&"companion_id", &"") != actor_id: return _invalid("Companion ownership is not reciprocal.")
+		for key: StringName in [&"shaft_id", &"connector_id", &"from", &"to", &"state", &"enqueued_at"]:
+			if trip[key] != other[key]: return _invalid("Companion trip was split.")
 	for actor_id: StringName in boarded_owners:
 		if not next_trips.has(actor_id): return _invalid("Cabin seat has no matching trip.")
 	var path_snapshot := _path.create_snapshot()
@@ -444,7 +502,10 @@ func _dispatch(car: Dictionary) -> void:
 func _board(car: Dictionary) -> void:
 	var config: Dictionary = car[&"config"]
 	var connector_id := _connector_id(config[&"shaft_id"], car[&"boarding_floor"], car[&"target_floor"])
-	var boarded := _path.dequeue_elevator_boarding(connector_id, car[&"current_floor"], _minute, config[&"capacity"])
+	var companions: Dictionary = {}
+	for actor: StringName in _trips:
+		if _trips[actor].has(&"companion_id"): companions[actor] = _trips[actor][&"companion_id"]
+	var boarded := _path.dequeue_elevator_boarding(connector_id, car[&"current_floor"], _minute, config[&"capacity"], companions)
 	car[&"boarded"] = []
 	for request: Dictionary in boarded:
 		var actor_id: StringName = request[&"unit_id"]