P07-01-WX: 仕上がった天候の機能の受入：自然天候・雨・嵐・世界樹と成人客のマナ霧・上部の表示と予報・保存と移行（マナ炉の産出 120 を除く。P07-01 の補助の作業。原単位への加算 0）

scripts/operations/operations_coordinator.gd

@@ -1013,6 +1013,15 @@ func _process_arrival_boundary(minute: int) -> CommandResult:
 			&"ARRIVAL_PLAN", minute, PHASE_CAPTURE, &"ARRIVAL_CAPTURE_INVALID"
 		)
 	var external_capacity := int(capacity_value)
+	# A13: the arrival boundary reports the weather share of planned arrivals
+	# (rain 50, otherwise 100). Absent means 100 for callers without weather.
+	var percent_value: Variant = capture.get(&"arrival_percent", 100)
+	if not _is_integral_value(percent_value) or int(percent_value) < 0 or int(percent_value) > 100:
+		return _failed_boundary_after_capture(
+			_arrival_boundary, capture_payload, token,
+			&"ARRIVAL_PLAN", minute, PHASE_CAPTURE, &"ARRIVAL_CAPTURE_INVALID"
+		)
+	var arrival_percent := int(percent_value)
 	var remaining := mini(
 		mini(local_capacity, external_capacity),
 		int(_config[&"max_arrivals_per_interval"])
@@ -1022,6 +1031,8 @@ func _process_arrival_boundary(minute: int) -> CommandResult:
 	var plans: Array[Dictionary] = []
 	var total_count := 0
 	var capped_rows: Array[Dictionary] = []
+	var accepted_by_row: Array[int] = []
+	var planned_total := 0
 	for row: Dictionary in intent_rows:
 		var accepted := mini(int(row[&"desired_count"]), remaining)
 		var key: String = row[&"key"]
@@ -1034,6 +1045,21 @@ func _process_arrival_boundary(minute: int) -> CommandResult:
 				&"guest_class": String(row[&"guest_class"]),
 				&"discarded_numerator": retained - capped_retained,
 			})
+		accepted_by_row.append(accepted)
+		planned_total += accepted
+		remaining -= accepted
+	# Rain keeps floor(planned * percent / 100) arrivals; the dropped arrivals
+	# are lost to the weather and are not carried to the next boundary.
+	var dropped := planned_total - planned_total * arrival_percent / 100
+	var drop_index := accepted_by_row.size() - 1
+	while dropped > 0 and drop_index >= 0:
+		var cut := mini(dropped, accepted_by_row[drop_index])
+		accepted_by_row[drop_index] -= cut
+		dropped -= cut
+		drop_index -= 1
+	for row_index in intent_rows.size():
+		var row: Dictionary = intent_rows[row_index]
+		var accepted := accepted_by_row[row_index]
 		if accepted <= 0:
 			continue
 		if plan_sequence > MAX_SEQUENCE_VALUE \
@@ -1058,7 +1084,6 @@ func _process_arrival_boundary(minute: int) -> CommandResult:
 		})
 		plan_sequence += 1
 		total_count += accepted
-		remaining -= accepted
 
 	var payload := capture_payload.duplicate(true)
 	payload[&"plans"] = plans