Research lab planet: spawn more often, block extractors, clearer feedback (#74, #75, #76)

#74: RESEARCH_LAB_CHANCE raised from 0.08 to 0.16 - research points
gate mid/late skill-tree nodes and vessel/lab research now (#63), so
0.08 was too scarce for how central they'd become to progression.

#75: an extractor placed on a research_lab planet would sit on an
empty resource id forever, since it yields nothing by design. Refused
in BuildController's placement confirm, with the same "explain the
refusal" idiom every other build gate uses. register_capture_points()
gained an optional definition_id parameter so the refusal/reward logic
can tell a research_lab planet apart without threading an extra
argument through every existing caller.

#76: conquering a research_lab awarded a research point with no
on-screen acknowledgement beyond a HUD number the player has no reason
to be watching at that exact moment. CaptureLabel's existing
"CONQUERED" flash now names the reward directly on a research_lab.

test_extractor_building.gd and test_planet_conquest_gate.gd both use a
"first planet chunk found" scan with no regard for definition_id; in
this world's fixed seed that chunk happens to be a research_lab, so
#75's new gate started refusing their otherwise-unrelated extractor
placement checks. Both now skip a research_lab chunk when picking
their target, same as test_research_lab_extractor_gate.gd does on
purpose for its own dedicated coverage of that refusal.

CaptureLabel.gd

@@ -5,6 +5,12 @@ extends Label
 # entirely when the current planet has no capture points (e.g. no setup
 # resolved for it) rather than showing "0/0".
 
+# A direct script preload, not the bare "PlanetDefinitions" global class_name
+# - the same load-order hazard PlanetSurfaceController's setup_host comment
+# already documents: the global identifier is only guaranteed registered
+# after an editor/import pass, a direct preload never depends on that.
+const PLANET_DEFINITIONS = preload("res://PlanetDefinitions.gd")
+
 var _was_conquered: bool = false
 
 
@@ -18,7 +24,14 @@ func _process(_delta: float) -> void:
 
 	var conquered: bool = GameState.is_planet_conquered(planet_id)
 	if conquered:
-		text = "CONQUERED"
+		# #76: a research_lab's whole reward is invisible otherwise - the
+		# research point balance lives in a HUD number the player has no
+		# reason to be watching at the exact moment it changes. Naming the
+		# reward right on the same flash that already announces conquest
+		# is the same "explain it where it happens" idiom BuildController
+		# uses for a refused build.
+		text = "CONQUERED - +1 RESEARCH POINT" \
+			if GameState.planet_definition_id == PLANET_DEFINITIONS.RESEARCH_LAB_ID else "CONQUERED"
 		if not _was_conquered:
 			_flash()
 	else:

WorldGen.gd

@@ -22,10 +22,12 @@ const GAS_GIANT_THRESHOLD: float = 0.55
 # chance independent of biome - not a second smooth region to tune against
 # the first.
 const BLACK_HOLE_CHANCE: float = 0.05
-# #63: findable without excessive exploration - research points gate mid/
-# late skill-tree nodes and vessel research, so a player needs to run into
-# one of these reasonably often, not just as a rare curiosity.
-const RESEARCH_LAB_CHANCE: float = 0.08
+# #63/#74: findable without excessive exploration - research points gate
+# mid/late skill-tree nodes and vessel research, so a player needs to run
+# into one of these reasonably often, not just as a rare curiosity. Raised
+# from 0.08 after playtesting found that rate too scarce for how central
+# research points had become to progression.
+const RESEARCH_LAB_CHANCE: float = 0.16
 
 # A predictable early gas source for play-testing. The origin chunk is
 # deterministically normal space. Its explicit in-chunk position puts it

tests/test_extractor_building.gd

@@ -27,7 +27,12 @@ func _initialize() -> void:
 	for x in range(-15, 15):
 		for y in range(-15, 15):
 			var chunk: Vector2i = Vector2i(x, y)
-			if WorldGen.has_planet_at_chunk(chunk):
+			# #75: this test is about the planet-proximity/duplicate rules,
+			# not resource type - skip a research_lab specifically, since it
+			# yields nothing and is correctly refused (see
+			# test_research_lab_extractor_gate.gd for that behaviour).
+			if WorldGen.has_planet_at_chunk(chunk) \
+					and WorldGen.planet_data_at_chunk(chunk).definition_id != "research_lab":
 				target_chunk = chunk
 				found = true
 				break

tests/test_planet_conquest_gate.gd

@@ -29,7 +29,12 @@ func _initialize() -> void:
 	for x in range(-15, 15):
 		for y in range(-15, 15):
 			var chunk: Vector2i = Vector2i(x, y)
-			if WorldGen.has_planet_at_chunk(chunk):
+			# #75: this test is about the conquest gate, not resource type -
+			# skip a research_lab specifically, since it yields nothing and
+			# is correctly refused regardless of conquest (see
+			# test_research_lab_extractor_gate.gd for that behaviour).
+			if WorldGen.has_planet_at_chunk(chunk) \
+					and WorldGen.planet_data_at_chunk(chunk).definition_id != "research_lab":
 				target_chunk = chunk
 				found = true
 				break

tests/test_research_lab_extractor_gate.gd

@@ -0,0 +1,114 @@
+extends SceneTree
+
+# Headless gameplay test: run with
+#   godot --headless -s res://tests/test_research_lab_extractor_gate.gd
+# Forgejo #75: a research_lab planet yields no resources at all (#63) - an
+# extractor placed there would sit on an empty resource id forever. The
+# build menu must refuse the placement and explain why, the same "explain
+# the refusal" idiom used for every other build gate. Mirrors
+# test_extractor_building.gd's own chunk-discovery/settle/confirm shape.
+
+var main_scene: Node
+var fleet: Node
+var game_state: Node
+var controller: Node
+var target_chunk: Vector2i
+var target_planet_id: String
+var stage: int = 0
+var elapsed: float = 0.0
+
+
+func _initialize() -> void:
+	var found: bool = false
+	for x in range(-40, 40):
+		for y in range(-40, 40):
+			var chunk: Vector2i = Vector2i(x, y)
+			if not WorldGen.has_planet_at_chunk(chunk):
+				continue
+			if WorldGen.planet_data_at_chunk(chunk).definition_id == "research_lab":
+				target_chunk = chunk
+				found = true
+				break
+		if found:
+			break
+	if not found:
+		print("TEST_RESEARCH_LAB_EXTRACTOR_GATE: FAIL (no research_lab chunk found to test with)")
+		quit(1)
+		return
+
+	game_state = root.get_node("GameState")
+	game_state.rocks = 200
+	game_state.buildings.clear()
+	game_state.extractors.clear()
+	game_state.planet_capture.clear()
+	target_planet_id = "chunk:%d:%d" % [target_chunk.x, target_chunk.y]
+	# This test is about the resource-id gate, not conquest itself (see
+	# test_planet_conquest_gate) - pre-conquer the target directly.
+	game_state.register_capture_points(target_planet_id, 1, "research_lab")
+	game_state.mark_point_captured(target_planet_id, 0)
+	game_state.reset_progression()
+	for node in GameState.SKILL_TREE:
+		game_state.unlocked.append(node.id)
+
+	main_scene = load("res://Main.tscn").instantiate()
+	root.add_child(main_scene)
+	fleet = main_scene.get_node("Fleet")
+	controller = main_scene.get_node("BuildController")
+
+
+func _process(delta: float) -> bool:
+	elapsed += delta
+	match stage:
+		0:
+			main_scene.get_node("AsteroidField").set_process(false)
+			main_scene.get_node("EnemySpawner").set_process(false)
+
+			var near: Vector2 = WorldGen.chunk_origin(target_chunk) + Vector2.ONE * WorldGen.CHUNK_SIZE * 0.5
+			for ship in fleet.ships:
+				ship.position = near
+			fleet.move_to(near)
+			elapsed = 0.0
+			stage = 1
+			return false
+		1:
+			var planet_field: Node = main_scene.get_node("PlanetField")
+			if elapsed < planet_field.check_interval + 0.2:
+				return false
+			if not planet_field.populated_chunks.has(target_chunk):
+				return _fail("the research_lab planet never spawned")
+			var planet: Node2D = planet_field.populated_chunks[target_chunk][0]
+			if String(planet.resource_type) != "":
+				return _fail("test setup error: chosen planet's resource_type is '%s', expected empty" \
+					% planet.resource_type)
+			for ship in fleet.ships:
+				ship.position = planet.position
+			fleet.move_to(planet.position)
+			elapsed = 0.0
+			stage = 2
+			return false
+		2:
+			if elapsed < 0.3:
+				return false
+			controller._on_build_pressed()
+			if not controller.build_menu.visible:
+				return _fail("the build menu did not open over the planet")
+
+			var before: int = game_state.extractors.size()
+			controller._show_building_info(GameState.BUILDING_EXTRACTOR)
+			controller._confirm_build()
+			if game_state.extractors.size() != before:
+				return _fail("an extractor was built on a research_lab planet")
+			if not ("nothing to extract" in controller.build_status.text):
+				return _fail("refusal did not explain itself, status was '%s'" % controller.build_status.text)
+			print("extractor refused on a research_lab planet, explained: '%s'" % controller.build_status.text)
+
+			print("TEST_RESEARCH_LAB_EXTRACTOR_GATE: PASS")
+			quit(0)
+			return true
+	return false
+
+
+func _fail(message: String) -> bool:
+	print("TEST_RESEARCH_LAB_EXTRACTOR_GATE: FAIL (%s)" % message)
+	quit(1)
+	return true