Typed owed vessels, ship lab building type, shield vessel gate

Groundwork for #5. vessels_owed carries the VESSEL TYPE rather than a
bare count, so a shield vessel finishing while the player is on a planet
comes back as a shield vessel. Fleet.add_ship takes a type, and vessels
already flying are re-statted when an upgrade is researched.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/test_building_stock_queue.gd

@@ -45,7 +45,7 @@ func _initialize() -> void:
 	game_state.extractors.clear()
 	game_state.rocks = 500
 	game_state.fleet_cargo = 0
-	game_state.ships_owed = 0
+	game_state.vessels_owed.clear()
 	# Room to grow: the default cap is BASE_FLEET_SIZE (5) and the fleet
 	# starts at exactly 5, so without this every completed order would have
 	# nowhere to put its vessel and the test would be measuring the cap
@@ -180,7 +180,7 @@ func _process(delta: float) -> bool:
 			# --- 6 + 7. no scene, no fleet: production still completes --
 			# The scene has to be GONE before the order is placed. With a
 			# fleet still alive and under its cap it claims the vessel the
-			# same frame production finishes, which would leave ships_owed
+			# same frame production finishes, which would leave vessels_owed
 			# back at 0 and prove nothing about orders surviving without it.
 			ships_at_start = fleet.ships.size()
 			scene.queue_free()
@@ -207,11 +207,11 @@ func _process(delta: float) -> bool:
 				print("TEST_BUILDING_STOCK_QUEUE: FAIL (order stalled once the space scene was gone)")
 				quit(1)
 				return true
-			if game_state.ships_owed < 1:
+			if game_state.vessels_owed.is_empty():
 				print("TEST_BUILDING_STOCK_QUEUE: FAIL (vessel completed with no fleet present was lost, not owed)")
 				quit(1)
 				return true
-			print("no scene at all -> order completed, %d vessel owed" % game_state.ships_owed)
+			print("no scene at all -> order completed, %d vessel owed" % game_state.vessels_owed.size())
 
 			# Come back to space: the fleet should claim what it is owed.
 			scene = load("res://Main.tscn").instantiate()
@@ -223,8 +223,8 @@ func _process(delta: float) -> bool:
 		8:
 			if elapsed < 0.5:
 				return false
-			if game_state.ships_owed != 0:
-				print("TEST_BUILDING_STOCK_QUEUE: FAIL (returning fleet never claimed its %d owed vessel(s))" % game_state.ships_owed)
+			if not game_state.vessels_owed.is_empty():
+				print("TEST_BUILDING_STOCK_QUEUE: FAIL (returning fleet never claimed its %d owed vessel(s))" % game_state.vessels_owed.size())
 				quit(1)
 				return true
 			print("fleet returned and claimed the owed vessel (ships=%d)" % fleet.ships.size())

tests/test_crafter_feedback.gd

@@ -38,7 +38,7 @@ func _initialize() -> void:
 	game_state.unlocked = ["shipyards", "coordination", "wing"]
 	game_state.rocks = 100
 	game_state.fleet_cargo = 0
-	game_state.ships_owed = 0
+	game_state.vessels_owed.clear()
 	scene = load("res://Main.tscn").instantiate()
 	root.add_child(scene)
 	controller = scene.get_node("BuildController")

tests/test_crafter_feedback.gd.uid

@@ -0,0 +1 @@
+uid://c33061yx51h5s

tests/test_hub_capacity.gd

@@ -34,7 +34,7 @@ func _initialize() -> void:
 	game_state.transporters.clear()
 	game_state.rocks = 900
 	game_state.fleet_cargo = 0
-	game_state.ships_owed = 0
+	game_state.vessels_owed.clear()
 	game_state.unlocked = ["shipyards", "logistics", "freight"]
 	scene = load("res://Main.tscn").instantiate()
 	root.add_child(scene)

tests/test_manual_supply_route.gd

@@ -50,7 +50,7 @@ func _initialize() -> void:
 	game_state.extractors.clear()
 	game_state.rocks = 40
 	game_state.fleet_cargo = 0
-	game_state.ships_owed = 0
+	game_state.vessels_owed.clear()
 	game_state.unlocked = ["shipyards", "coordination", "wing", "squadron", "armada"]
 	scene = load("res://Main.tscn").instantiate()
 	root.add_child(scene)

tests/test_transporter_supply.gd

@@ -56,7 +56,7 @@ func _initialize() -> void:
 	game_state.transporters.clear()
 	game_state.rocks = 200
 	game_state.fleet_cargo = 0
-	game_state.ships_owed = 0
+	game_state.vessels_owed.clear()
 	game_state.unlocked = ["shipyards", "logistics", "freight", "coordination", "wing", "squadron", "armada"]
 	scene = load("res://Main.tscn").instantiate()
 	root.add_child(scene)