refactor: cleanup signal listeners and auto-remove handlers (#4)

Replace global setMaxListeners(0) with explicit SIGINT/SIGTERM listener management:
- use process.once in createServer()
- remove handlers on httpServer close in setupCleanupHandlers()

Author: pchuri

src/server.ts

@@ -32,10 +32,12 @@ export function createServer(): Server {
   setupToolHandlers(server);
 
   server.onerror = (error) => console.error("[MCP Error]", error);
-  process.on("SIGINT", async () => {
+  // Graceful shutdown on Ctrl-C, remove listener afterwards to prevent leaks
+  const sigintHandler = async () => {
     await server.close();
     process.exit(0);
-  });
+  };
+  process.once("SIGINT", sigintHandler);
 
   return server;
 }

src/utils/httpServer.ts

@@ -79,12 +79,18 @@ function setupCleanupHandlers(
 
     httpServer.close(() => {
       console.log("Server closed");
+      // exit after cleanup
       process.exit(0);
     });
   };
 
+  // Attach signal handlers and remove them on server close to avoid leaks
   process.on("SIGINT", cleanup);
   process.on("SIGTERM", cleanup);
+  httpServer.once("close", () => {
+    process.removeListener("SIGINT", cleanup);
+    process.removeListener("SIGTERM", cleanup);
+  });
 }
 
 /**