二七王：新增 Node 单元测试，CLAUDE.md 记录测试命令

- test/_shim.js：平台全局垫片(min_ary_include/deduct、min_random/now/ontimeout、
  youle_erqiwang.import mock)，忠实复刻 minhttp.js；仅测试用，不进正式代码
- test/_assert.js + run.js：极简断言与总运行器
- test/test_arith.js(扣底/算子常规+爬坡/算奖/甩牌/跟牌分量) test_config.js(位串/局数扣卡)
  test/test_paiju.js(亮牌/结算 get_paiju_account 集成)，共 89 项断言全过
- test/README.md：运行方式与双运行时原理
- CLAUDE.md：常用命令补测试入口，说明服务端双运行时规范

（CLAUDE.md 内另含此前一处措辞微调，随本次文档更新一并纳入）

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

server/games/erqiwang/test/_shim.js

@@ -0,0 +1,26 @@
+// Node 单测环境：提供正式代码按全局名引用的平台工具（不进正式代码，dev-guide 01 §1）
+global.min_ary_include = function(aryparent, arychild){
+	for (var i = 0; i < arychild.length; i++){
+		var found = false;
+		for (var j = 0; j < aryparent.length; j++){ if (aryparent[j] == arychild[i]){ found = true; break; } }
+		if (!found){ return false; }
+	}
+	return true;
+};
+global.min_ary_deduct = function(aryparent, arychild){
+	var re = [];
+	for (var i = 0; i < aryparent.length; i++){
+		var found = false;
+		for (var j = 0; j < arychild.length; j++){ if (aryparent[i] == arychild[j]){ found = true; break; } }
+		if (!found){ re.push(aryparent[i]); }
+	}
+	return re;
+};
+global.min_random    = function(min, max){ return min + Math.round(Math.random() * (max - min)); };
+global.min_now       = function(ts){ return ts ? ts : Date.now(); };
+global.min_ontimeout = function(func, time){ /* 单测不真正异步执行 */ };
+global.youle_erqiwang = global.youle_erqiwang || {
+	import: { check_player: function(){ return null; }, deduct_roomcard: function(){}, save_grade: function(){} },
+	app:    { SendPack: function(){} }
+};
+module.exports = {};