docs(config): 添加AI代理编码规范和配置系统集成测试

- 创建AGENTS.md文档定义AI代理编码行为规则
- 包含环境能力清单、注释规则、代码风格要求
- 定义测试要求、安全规则和文档规范
- 添加端到端集成测试验证生成配置消费者功能
- 实现跨域配置表加载和强类型访问验证
- 添加按域、表名和自定义谓词过滤注册支持
- 提供完整的测试验证命令和执行期望说明

AGENTS.md

@@ -123,6 +123,8 @@ All generated or modified code MUST include clear and meaningful comments where
 - Every non-trivial feature, bug fix, or behavior change MUST include tests or an explicit justification for why a test
   is not practical.
 - Public API changes must be covered by unit or integration tests.
+- When a public API defines multiple contract branches, tests MUST cover the meaningful variants, including null,
+  empty, default, and filtered inputs when those branches change behavior.
 - Regression fixes should include a test that fails before the fix and passes after it.
 
 ### Test Organization

GFramework.Game.Tests/Config/GeneratedConfigConsumerIntegrationTests.cs

@@ -138,6 +138,16 @@ public class GeneratedConfigConsumerIntegrationTests
                 });
         await tableNameLoader.LoadAsync(tableNameRegistry);
 
+        var emptyAllowListRegistry = new ConfigRegistry();
+        var emptyAllowListLoader = new YamlConfigLoader(_rootPath)
+            .RegisterAllGeneratedConfigTables(
+                new GeneratedConfigRegistrationOptions
+                {
+                    IncludedConfigDomains = Array.Empty<string>(),
+                    IncludedTableNames = Array.Empty<string>()
+                });
+        await emptyAllowListLoader.LoadAsync(emptyAllowListRegistry);
+
         var monsterDomain = MonsterConfigBindings.ConfigDomain;
         var predicateRegistry = new ConfigRegistry();
         var predicateLoader = new YamlConfigLoader(_rootPath)
@@ -151,6 +161,11 @@ public class GeneratedConfigConsumerIntegrationTests
 
         Assert.Multiple(() =>
         {
+            Assert.That(emptyAllowListRegistry.TryGetMonsterTable(out var emptyAllowListMonsterTable), Is.True);
+            Assert.That(emptyAllowListMonsterTable, Is.Not.Null);
+            Assert.That(emptyAllowListRegistry.TryGetItemTable(out var emptyAllowListItemTable), Is.True);
+            Assert.That(emptyAllowListItemTable, Is.Not.Null);
+
             Assert.That(domainRegistry.TryGetMonsterTable(out var domainMonsterTable), Is.True);
             Assert.That(domainMonsterTable, Is.Not.Null);
             Assert.That(domainRegistry.TryGetItemTable(out _), Is.False);