feat: implement weapon system, loadout manager, and specialized projectile behaviors with associated assets

weapons/homing_projectile.gd

@@ -0,0 +1,25 @@
+extends ExplosiveProjectile
+class_name HomingProjectile
+
+var weapon_source: Node
+var turn_speed: float = 5.0
+
+func _physics_process(delta: float) -> void:
+	if is_instance_valid(weapon_source) and weapon_source.get("homing_target_pos") != null:
+		var target: Vector3 = weapon_source.homing_target_pos
+		if target != Vector3.ZERO:
+			# Steer towards target
+			var speed = velocity.length()
+			var desired_dir = (target - global_position).normalized()
+			var current_dir = velocity.normalized()
+			
+			var new_dir = current_dir.lerp(desired_dir, turn_speed * delta).normalized()
+			velocity = new_dir * speed
+			
+			# Also rotate visually to match new direction
+			var up_vec = Vector3.UP
+			if abs(new_dir.dot(up_vec)) > 0.99:
+				up_vec = Vector3.RIGHT
+			transform.basis = Basis.looking_at(new_dir, up_vec)
+	
+	super._physics_process(delta)