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/tests/unit/core/minesweeper_rules_test.gd

@@ -53,7 +53,7 @@ func _test_install_invariants() -> void:
 	Kit.check("装板带初始扩张揭示（%d 格，非零且未铺满安全格 %d）" % [opened, safe_total],
 		opened > 0 and opened < safe_total)
 	Kit.check("安全格余量 = 安全格总数 − 已揭示数（%d − %d）" % [safe_total, opened],
-		_rules.safe_remaining() == safe_total - opened)
+		_rules._safe_remaining() == safe_total - opened)
 	Kit.check("装板后仍有未揭示格", _rules.has_unrevealed())
 
 
@@ -86,12 +86,12 @@ func _test_reveal_advances() -> void:
 	if c == Vector2i(-1, -1):
 		Kit.check("存在未揭示安全格（揭示推进前置）", false)
 		return
-	var before: int = _rules.safe_remaining()
+	var before: int = _rules._safe_remaining()
 	var ok: bool = _rules.fx_reveal(c)
 	Kit.check("专长揭示受理（fx_reveal 不受邻接约束）", ok)
 	Kit.check("fx_reveal 后该格已揭示", _rules.is_revealed(c))
-	Kit.check("fx_reveal 后安全格余量递减（%d → %d）" % [before, _rules.safe_remaining()],
-		_rules.safe_remaining() < before)
+	Kit.check("fx_reveal 后安全格余量递减（%d → %d）" % [before, _rules._safe_remaining()],
+		_rules._safe_remaining() < before)
 
 
 func _test_seal_place() -> void: