修复开发态 AGC 工具进程启动路径

避免 Cargo 热重载后 current_exe 路径指向已删除旧二进制
Linux 开发态通过当前客户端进程的稳定 executable 引用启动 agc_tools
补充 DirectProject MCP 可执行路径回归测试

apps/ai-game-creator-shell/src-tauri/src/agent/codex_app_server.rs

@@ -1061,6 +1061,31 @@ fn quoted_toml_string(value: &str) -> Result<String, platform_llm::LlmError> {
     })
 }
 
+fn direct_tools_mcp_executable_path() -> Result<std::path::PathBuf, platform_llm::LlmError> {
+    // In Linux development mode Cargo may replace/unlink the running binary
+    // while Tauri's app-server pool is still alive.  A child launched from the
+    // old `current_exe()` pathname then fails with ENOENT.  `/proc/<pid>/exe`
+    // keeps referring to this process' executable inode until this AGC process
+    // exits, so the MCP child remains launchable across hot rebuilds.
+    #[cfg(target_os = "linux")]
+    {
+        let proc_executable = std::path::PathBuf::from(format!("/proc/{}/exe", std::process::id()));
+        if proc_executable.exists() {
+            return Ok(proc_executable);
+        }
+    }
+
+    let current_executable = std::env::current_exe().map_err(|error| {
+        platform_llm::LlmError::InvalidConfig(format!("定位 AGC 受控工具进程失败：{error}"))
+    })?;
+    if !current_executable.is_file() {
+        return Err(platform_llm::LlmError::InvalidConfig(
+            "定位 AGC 受控工具进程失败：当前客户端可执行文件已不存在".to_string(),
+        ));
+    }
+    Ok(current_executable)
+}
+
 fn configure_game_creator_codex_app_server_command(
     command: &mut tokio::process::Command,
     llm: &GameCreatorLlmConfig,
@@ -1095,9 +1120,7 @@ fn configure_game_creator_codex_app_server_command_for_mode(
         command.arg("-c").arg("agents.enabled=false");
     }
     if workspace_mode == CodexAppServerWorkspaceMode::DirectProject {
-        let current_executable = std::env::current_exe().map_err(|error| {
-            platform_llm::LlmError::InvalidConfig(format!("定位 AGC 受控工具进程失败：{error}"))
-        })?;
+        let current_executable = direct_tools_mcp_executable_path()?;
         command
             .arg("-c")
             .arg(format!(
@@ -3592,6 +3615,15 @@ mod tests {
         assert!(game_creator_codex_app_server_validate_llm_config(&llm).is_ok());
     }
 
+    #[cfg(target_os = "linux")]
+    #[test]
+    fn direct_tools_mcp_uses_a_stable_parent_executable_reference() {
+        assert_eq!(
+            direct_tools_mcp_executable_path().expect("resolve AGC MCP executable"),
+            std::path::PathBuf::from(format!("/proc/{}/exe", std::process::id()))
+        );
+    }
+
     #[test]
     fn direct_project_command_configures_the_reviewed_agc_tools_bridge() {
         let mut command = tokio::process::Command::new("fixture");