Sharpen upgrades, mark the convoy's destination, and give the world sound

#204 the Beam Collimator widens the beam instead of adding range to one that
already crosses the screen; beam width becomes a per-shot vessel stat.
#205 the Energy Propulser gains three upgrades - dash recharge, dash reach,
and boosted-cruise drain - which turns three constants into vessel stats.
#206 three further doctrines carry the fleet from ten to twenty.
#207 the prologue's World Ship gets a marker, through the scanner's own
guidance arrow rather than a second one.
#208 #210 #213 #214 four new synthesised sounds: the breach opening, cargo
reaching the hold, a rock breaking, and a gas bomb blooming.
#215 building health bars are larger, plated and framed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019AJMdB7iuHuLFZM1aBu3GD

controllers/LaserController.gd

@@ -27,7 +27,6 @@ const DRAG_RADIUS: float = 260.0
 # it on the edge of the screen, which is the half that matters when the point
 # of dragging further is to reach past what is already close.
 const FRAMING_FACTOR: float = 2.0
-const BEAM_HALF_WIDTH := BEAM_EFFECT.BEAM_HALF_WIDTH
 const FLASH_DURATION := BEAM_EFFECT.FLASH_DURATION
 const ENERGY_PER_SHOT: int = VesselLaserComponent.ENERGY_PER_SHOT
 
@@ -44,10 +43,22 @@ func _status_path() -> NodePath: return "../UI/LaserStatus"
 func _component_id() -> String: return "laser"
 func _ammo_resource() -> String: return GameState.RESOURCE_ENERGY
 func _ammo_cost() -> int: return ENERGY_PER_SHOT
-func _aim_padding() -> float: return BEAM_HALF_WIDTH
+func _aim_padding() -> float: return _aim_half_width()
 func _has_effect_visuals() -> bool: return not beams.is_empty()
 
 
+# The width the next shot will cut, off the hull that will cut it. Same shape
+# and same reason as _aim_max_range() below: #204 made this upgradeable, so a
+# constant here would draw last research's beam.
+func _aim_half_width() -> float:
+	var ship: Node2D = _next_ready_ship()
+	if ship != null:
+		var component: Node = ship.get_component(_component_id())
+		if component != null:
+			return component.beam_half_width
+	return GameState.vessel_stat(GameState.VESSEL_LASER, "beam_half_width")
+
+
 func _aim_max_range() -> float:
 	# Falls back to the VESSEL DEFINITION's own beam_range, not to a copy of
 	# the number. This used to hardcode 950.0 in both branches, which silently
@@ -108,7 +119,8 @@ func _perform_shot(ship: Node2D, component: Node) -> void:
 	var direction: Vector2 = aim_target - ship.global_position
 	direction = direction.normalized() if direction.length() > 0.001 else Vector2.UP
 	var effect: Node2D = BEAM_EFFECT.fire(get_tree().root, ship.global_position,
-		direction, component.beam_range, int(component.damage))
+		direction, component.beam_range, int(component.damage),
+		component.beam_half_width)
 	beams.append(effect)
 	last_hit_count = int(effect.hit_count)
 
@@ -160,14 +172,14 @@ func _draw() -> void:
 	# units puts the camera far enough out that a mark measured in world units
 	# would be a few pixels of nothing at the moment it matters most.
 	var across: Vector2 = far_end.direction_to(origin).orthogonal() \
-		* _screen_units(END_TICK_PIXELS)
+		* maxf(_aim_half_width(), _screen_units(END_TICK_PIXELS))
 	NeonDraw.draw_glowing_line(self, far_end - across, far_end + across,
 		TARGET_COLOR, 0.7, 0.5)
 	# What the assist picked, when that is nearer than the far end. The line
 	# still runs past it - everything behind it on the same line is hit too.
 	if origin.distance_to(aim_target) < reach - 1.0:
 		NeonDraw.draw_glowing_circle(self, aim_target,
-			maxf(BEAM_HALF_WIDTH, _screen_units(TARGET_RING_PIXELS)),
+			maxf(_aim_half_width(), _screen_units(TARGET_RING_PIXELS)),
 			TARGET_COLOR, 0.7)