fix: graceful ctrl+c shutdown and await session-end memory writes

src/daemon/services.ts

@@ -540,8 +540,40 @@ export async function startServices(deps: {
   });
 
   // Signal handlers
-  const signalHandler = () => {
-    lifecycle.shutdown().then(() => process.exit(0));
+  let shutdownPromise: Promise<void> | null = null;
+  let forceExitArmed = false;
+  const forceExitTimeoutMs = 15_000;
+
+  const signalHandler = (signal: NodeJS.Signals) => {
+    if (shutdownPromise) {
+      if (forceExitArmed) {
+        console.warn(`Second ${signal} received; forcing exit now.`);
+        process.exit(130);
+      }
+      forceExitArmed = true;
+      console.warn(`Shutdown already in progress. Send ${signal} again to force exit.`);
+      return;
+    }
+
+    console.log(`Received ${signal}; shutting down gracefully...`);
+    shutdownPromise = lifecycle.shutdown();
+    const forceTimer = setTimeout(() => {
+      forceExitArmed = true;
+      console.error(`Graceful shutdown timed out after ${forceExitTimeoutMs / 1000}s; forcing exit.`);
+      process.exit(130);
+    }, forceExitTimeoutMs);
+    forceTimer.unref();
+
+    shutdownPromise
+      .then(() => {
+        clearTimeout(forceTimer);
+        process.exit(0);
+      })
+      .catch((error) => {
+        clearTimeout(forceTimer);
+        console.error('Graceful shutdown failed:', error);
+        process.exit(1);
+      });
   };
 
   process.on('SIGINT', signalHandler);