test: GLM-5.3 补充所有 SDK 测试覆盖率

- Go SDK: coverage_boost_test.go (3个文件)
- Python SDK: test_invoker_coverage.py
- JS SDK: coverage_boost.test.ts
- Java SDK: ServerHttpInvokerBoostTest + SdkWireMessagesBoostTest
- C# SDK: CroupierInvokerBoostTests
- C++ SDK: test_coverage_boost.cpp + CMakeLists 更新

修正测试假设错误：
- Python: responder query string 修复
- C#: ExtractResult 缺失 result 键宽容契约
- C++: 幂等键格式修正（32位hex而非UUID）

Author: cuihairu

sdks/cpp/CMakeLists.txt

@@ -690,6 +690,7 @@ if(BUILD_TESTS)
             tests/test_json_schema.cpp
             tests/test_config_generation.cpp
             tests/test_invoker_retry.cpp
+            tests/test_coverage_boost.cpp
         )
 
         # Real shared-object plugins used by the dynamic loader tests.