W23: close mailroom metadata and network validation tests

- Refresh agents STATUS to W22.6 and exclude mailroom from metadata scans
- Add mailroom dispatch checklist and defensive rules
- Register F-23.D-1 and tag network input validation defense-in-depth
- Update network plugin tests for header length limits
- Fix LSP test metadata and remove orphan anthropic_internal.hpp

Verification:
- cmake --build build --config Release: 0 error, 0 warning
- ctest --test-dir build --output-on-failure: 10/10 passed
- ctest --test-dir build -R dstalk_smoke_test --output-on-failure: passed
- python scripts/check_agents_metadata.py --strict: passed

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

plugins_upper/anthropic/src/anthropic_internal.hpp

@@ -1,46 +0,0 @@
-// ============================================================================
-// anthropic_internal.hpp — 内部声明：供单元测试访问的函数与数据结构
-// ============================================================================
-// 仅在 tests 中使用；非 plugin 公共 API
-// ============================================================================
-
-#ifndef ANTHROPIC_INTERNAL_HPP
-#define ANTHROPIC_INTERNAL_HPP
-
-#include "dstalk/dstalk_host.h"
-#include "dstalk/dstalk_services.h"
-
-#include "ai_common.hpp"
-
-#include <string>
-#include <vector>
-
-// ---- 从 dstalk_ai 命名空间导入共享类型与函数 ----
-using dstalk_ai::PluginConfig;
-using dstalk_ai::ToolCallAccum;
-using dstalk_ai::StreamContext;
-using dstalk_ai::secure_zero;
-using dstalk_ai::extract_host_port;
-
-// ---- 全局变量 ----
-extern PluginConfig g_cfg;
-extern std::string g_tools_json;
-
-// ---- 测试用函数声明 ----
-bool parse_sse_data(const std::string& data, std::string& token_out,
-                    StreamContext* ctx);
-
-std::string build_request_json(const dstalk_message_t* history, int history_len,
-                               const std::string& user_input,
-                               const std::string& tools_json,
-                               bool stream);
-
-std::string build_headers_json();
-
-void my_free_result(dstalk_chat_result_t* result);
-
-int my_configure(const char* provider, const char* base_url,
-                 const char* api_key, const char* model,
-                 int max_tokens, double temperature);
-
-#endif // ANTHROPIC_INTERNAL_HPP