feat: Add initial core game scene, player script, and static Tekton manager.

scenes/player.gd

@@ -1217,6 +1217,14 @@ func is_position_occupied(pos: Vector2i) -> bool:
 		if p.is_player_moving and p.target_position == pos:
 			return true
 			
+	# Prevent overlap with Static Tekton Stands (3x3 area)
+	if enhanced_gridmap:
+		for stand in get_tree().get_nodes_in_group("StaticTektonStands"):
+			var local_pos = enhanced_gridmap.to_local(stand.global_position)
+			var stand_map_pos = enhanced_gridmap.local_to_map(local_pos)
+			if abs(pos.x - stand_map_pos.x) <= 1 and abs(pos.y - stand_map_pos.z) <= 1:
+				return true
+				
 	return false
 
 func find_valid_starting_position() -> Vector2i: