Add explicit stairs and measure elevator congestion with real actors

data/facilities/infrastructure/guest_stairs.tres

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+[gd_resource type="Resource" script_class="FacilityDefinition" load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://scripts/data/facility_definition.gd" id="1"]
+
+[resource]
+script = ExtResource("1")
+id = &"guest_stairs"
+display_name = "客用階段"
+description = "上階の踊り場を設置し、直下の表層通路へつなぐ階段。客と従業員が待たずに昇り降りする。"
+zone = 0
+layer = 0
+footprint = Vector2i(1, 1)
+allowed_rotations = Array[int]([0])
+construction_cost = {&"gold": 40, &"materials": 0}
+build_minutes = 10
+weight_per_cell = 1
+pass_through = true
+maintenance_mana = 0
+power_priority = 10
+staff_min = 0
+staff_max = 0
+capacity = 3
+queue_capacity = 0
+base_service_minutes = 1
+base_quality = 50
+base_price = 0
+tags = Array[StringName]([&"guest_access", &"movement", &"route_subslot", &"schema_facility_proxy", &"stairs", &"vertical_connector"])

data/facilities/infrastructure/service_stairs.tres

@@ -0,0 +1,27 @@
+[gd_resource type="Resource" script_class="FacilityDefinition" load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://scripts/data/facility_definition.gd" id="1"]
+
+[resource]
+script = ExtResource("1")
+id = &"service_stairs"
+display_name = "業務用階段"
+description = "上階の踊り場を設置し、直下の裏層通路へつなぐ従業員専用の階段。物資運搬にも使う。"
+zone = 0
+layer = 1
+footprint = Vector2i(1, 1)
+allowed_rotations = Array[int]([0])
+construction_cost = {&"gold": 50, &"materials": 0}
+build_minutes = 10
+weight_per_cell = 1
+pass_through = true
+maintenance_mana = 0
+power_priority = 10
+staff_min = 0
+staff_max = 0
+capacity = 2
+queue_capacity = 0
+base_service_minutes = 1
+base_quality = 50
+base_price = 0
+tags = Array[StringName]([&"movement", &"route_subslot", &"schema_facility_proxy", &"staff_only", &"stairs", &"vertical_connector"])