Add tentacled boss planet encounter

planets/BossPlanetVisual.gd

@@ -0,0 +1,51 @@
+extends Node2D
+
+# The space-side landmark: organic, asymmetric and visibly awake. The landed
+# encounter uses the same pink/cyan palette at a much larger scale.
+const RADIUS: float = 104.0
+const FLESH_COLOR := Color(0.95, 0.18, 0.58)
+const VEIN_COLOR := Color(0.25, 0.9, 1.0)
+const CORE_COLOR := Color(0.11, 0.015, 0.08)
+
+var phase: float = 0.0
+
+
+func configure(shape_seed: int) -> void:
+	phase = float(posmod(shape_seed, 628)) / 100.0
+	queue_redraw()
+
+
+func extractor_anchor() -> Vector2:
+	return Vector2(0.0, -(RADIUS + 36.0))
+
+
+func _process(delta: float) -> void:
+	phase += delta
+	queue_redraw()
+
+
+func _draw() -> void:
+	# Eight short feelers make this read as a creature before the central eye
+	# is even noticed.
+	for i in range(8):
+		var angle: float = TAU * float(i) / 8.0 + phase * 0.08
+		var points := PackedVector2Array()
+		for step in range(7):
+			var t: float = float(step) / 6.0
+			var radial: float = lerpf(RADIUS * 0.72, RADIUS * 1.35, t)
+			var curl: float = sin(t * PI * 1.7 + phase * 1.5 + float(i)) * 0.16 * t
+			points.append(Vector2.from_angle(angle + curl) * radial)
+		NeonDraw.draw_glowing_path(self, points, FLESH_COLOR, 0.75, 0.55, CORE_COLOR)
+
+	var body := PackedVector2Array()
+	for i in range(24):
+		var angle: float = TAU * float(i) / 24.0
+		var pulse: float = 1.0 + 0.035 * sin(phase * 2.2 + float(i) * 1.7)
+		body.append(Vector2.from_angle(angle) * RADIUS * pulse)
+	NeonDraw.draw_glowing_polygon(self, body, FLESH_COLOR, 0.9, CORE_COLOR)
+
+	var eye_scale: float = 1.0 + 0.08 * sin(phase * 3.0)
+	draw_set_transform(Vector2.ZERO, 0.0, Vector2(0.62, 1.0) * eye_scale)
+	NeonDraw.draw_glowing_circle(self, Vector2.ZERO, 34.0, VEIN_COLOR, 1.0, CORE_COLOR)
+	NeonDraw.draw_glowing_circle(self, Vector2.ZERO, 13.0, Color.WHITE, 1.0, CORE_COLOR)
+	draw_set_transform(Vector2.ZERO, 0.0, Vector2.ONE)