iter52-卡1：迭代52卡①(minesweeper_rules公开面还债): safe_remaining私有化21→20(函数体逐字不动,测试4行改锚)——gdstyle S13归绿零新基线键,全仓.safe_remaining(零残留; 验收档中

game/core/minesweeper_rules.gd

@@ -98,7 +98,7 @@ func revealed_cells() -> Array:
 	return _revealed.keys()
 
 
-func safe_remaining() -> int:
+func _safe_remaining() -> int:
 	var n := 0
 	for c in _board.safe_cells():
 		if not _revealed.has(c):
@@ -107,7 +107,7 @@ func safe_remaining() -> int:
 
 
 func clear_map_cleared() -> bool:
-	return safe_remaining() == 0
+	return _safe_remaining() == 0
 
 
 # ---- 中立移除（P1 甲：邻接数字=原始雷数冻结零重算；P2 甲：移除格呈现退色降档；