fix: Godot 4.2.1 compat and map builder fixes

- Fix tab character in _build_elevated_walkways() call (line 63)
- Fix untyped 'pos' variable in grapple pillar loop (line 376)
- Remove fog_sky_affinity (Godot 4.3+ only property)
- Replace preload() with load() for runtime script loading
- Replace 'is DoubleBarrelShotgun' type check with duck-typing
- Fix 'is not OfflineMultiplayerPeer' syntax in grenade spawn
- Replace absf() with abs() in state_machine, state_air, state_ground
- Update test_level.tscn to remove stale UID reference

All fixes verified: PARSE OK and scene runs without script errors
on Godot 4.2.1 headless.

movement/movement_state_machine.gd

@@ -226,7 +226,7 @@ func detect_wall_horizontal() -> Vector3:
 				continue
 			var n: Vector3 = hit.get("normal", Vector3.ZERO)
 			# Wall must be roughly vertical (normal mostly horizontal)
-			if absf(n.y) < 0.3 and n.length_squared() > 0.0:
+			if abs(n.y) < 0.3 and n.length_squared() > 0.0:
 				wall_normal = n.normalized()
 				wall_side = side_data["side"]
 				return wall_normal
@@ -246,7 +246,7 @@ func detect_wall_horizontal() -> Vector3:
 				if collider is PlayerMovementController or collider is CharacterBody3D or collider.has_method("take_damage"):
 					continue
 				var n: Vector3 = hit.get("normal", Vector3.ZERO)
-				if absf(n.y) < 0.3 and n.length_squared() > 0.0:
+				if abs(n.y) < 0.3 and n.length_squared() > 0.0:
 					wall_normal = n.normalized()
 					wall_side = side_data["side"]
 					return wall_normal
@@ -294,7 +294,7 @@ func detect_wall_forward() -> Dictionary:
 		return {"hit": false, "normal": Vector3.ZERO, "is_short": false}
 		
 	var normal: Vector3 = best_hit.get("normal", Vector3.ZERO)
-	if absf(normal.y) >= 0.3:
+	if abs(normal.y) >= 0.3:
 		return {"hit": false, "normal": Vector3.ZERO, "is_short": false} # Not a vertical wall
 		
 	# Check if wall is short (ledge check) using a top ray

movement/player_movement_controller.gd

@@ -1112,7 +1112,7 @@ func _throw_grenade() -> void:
 	var throw_vel = camera.global_transform.basis.z * -throw_speed + Vector3.UP * throw_up_speed + velocity
 	var spawn_pos = camera.global_position + camera.global_transform.basis.z * -0.5
 	
-	if multiplayer.has_multiplayer_peer() and multiplayer.multiplayer_peer is not OfflineMultiplayerPeer:
+	if multiplayer.has_multiplayer_peer() and not (multiplayer.multiplayer_peer is OfflineMultiplayerPeer):
 		server_spawn_grenade.rpc_id(1, spawn_pos, throw_vel)
 	else:
 		_spawn_grenade_local(spawn_pos, throw_vel, 1)

movement/states/state_air.gd

@@ -145,7 +145,7 @@ func update(delta: float) -> void:
 			
 			# Require looking mostly along the wall (angle > 41 degrees from normal)
 			# and inputting mostly along the wall (angle > 31 degrees from normal, allows W+A/D diagonally into wall)
-			if absf(h_look.dot(wall_n)) < 0.75 and absf(wish_dir.dot(wall_n)) < 0.85:
+			if abs(h_look.dot(wall_n)) < 0.75 and abs(wish_dir.dot(wall_n)) < 0.85:
 				machine.switch_to("wall_run")
 				return
 

movement/states/state_ground.gd

@@ -96,7 +96,7 @@ func update(delta: float) -> void:
 	if wish_dir.length_squared() > 0.01 and not machine.input_crouch:
 		for i in range(player.get_slide_collision_count()):
 			var col = player.get_slide_collision(i)
-			if absf(col.get_normal().y) < 0.3: # Hit a wall
+			if abs(col.get_normal().y) < 0.3: # Hit a wall
 				var max_step_height = 0.95
 				var space_state = player.get_world_3d().direct_space_state
 				var feet_y = player.global_position.y - (machine.original_capsule_height / 2.0)
@@ -209,7 +209,7 @@ func update(delta: float) -> void:
 				
 				# Require looking mostly along the wall (angle > 41 degrees from normal)
 				# and inputting mostly along the wall (angle > 31 degrees from normal, allows W+A/D diagonally into wall)
-				if absf(h_look.dot(wall_n)) < 0.75 and absf(wish_dir.dot(wall_n)) < 0.85:
+				if abs(h_look.dot(wall_n)) < 0.75 and abs(wish_dir.dot(wall_n)) < 0.85:
 					machine.switch_to("wall_run")
 					return