fix(lib): update runtime entry handling for improved Windows compatibility

Author: Gioee

src/lib.rs

@@ -18,8 +18,8 @@ use serde_json;
 // Global runtime - one runtime per process that stays alive
 static GLOBAL_RUNTIME: OnceLock<tokio::runtime::Runtime> = OnceLock::new();
 
-// Global runtime enter guard - keeps runtime as current for the entire process (Windows fix)
-static GLOBAL_RUNTIME_GUARD: OnceLock<Mutex<Option<tokio::runtime::EnterGuard<'static>>>> = OnceLock::new();
+// Flag to track if runtime has been entered (Windows fix for nested spawns)
+static RUNTIME_ENTERED: OnceLock<()> = OnceLock::new();
 
 // Global client instance - one client per process
 static GLOBAL_CLIENT: OnceLock<Mutex<Option<McpClient>>> = OnceLock::new();
@@ -253,15 +253,17 @@ fn get_runtime() -> &'static tokio::runtime::Runtime {
         tokio::runtime::Runtime::new().expect("Failed to create Tokio runtime")
     });
 
-    // On first call, enter the runtime and keep the guard alive forever (Windows fix for nested spawns)
-    GLOBAL_RUNTIME_GUARD.get_or_init(|| {
+    // On first call, enter the runtime and forget the guard (Windows fix for nested spawns)
+    // This makes the runtime "current" for the entire program duration
+    RUNTIME_ENTERED.get_or_init(|| {
         // SAFETY: The runtime is stored in a static and lives for the entire program duration
         let guard = unsafe {
             let runtime_ptr: *const tokio::runtime::Runtime = runtime;
             let runtime_ref: &'static tokio::runtime::Runtime = &*runtime_ptr;
             runtime_ref.enter()
         };
-        Mutex::new(Some(guard))
+        // Forget the guard so it never gets dropped - keeps runtime as current forever
+        std::mem::forget(guard);
     });
 
     runtime