feat: Add core player entity with network-synced properties, character selection, and manager integration.

scenes/player.gd

@@ -12,6 +12,8 @@ var powerup_manager
 # Score tracking
 var score: int = 0
 
+signal position_changed
+
 # Display name (synced across network)
 var _display_name: String = ""
 var display_name: String:
@@ -1412,6 +1414,7 @@ func start_movement_along_path(path: Array, clear_visual: bool = true):
 
 func update_player_position(grid_position: Vector2i):
 	position = grid_to_world(grid_position)
+	emit_signal("position_changed")
 
 func grid_to_world(grid_position: Vector2i) -> Vector3:
 	var world_position = Vector3(
@@ -1939,6 +1942,8 @@ func set_spawn_position(pos: Vector2i):
 	
 	# Reveal character now that it's in the correct position
 	visible = true
+	
+	emit_signal("position_changed")
 
 
 @rpc("any_peer", "call_local", "reliable")