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

src/cli/tui.ts

@@ -227,15 +227,29 @@ export function registerTuiCommand(program: Command): void {
         },
       });
 
-      const cleanup = () => {
-        void lifecycle.shutdown();
-        sessionStore.close();
+      let cleanupPromise: Promise<void> | null = null;
+      const cleanup = async () => {
+        if (!cleanupPromise) {
+          cleanupPromise = (async () => {
+            await lifecycle.shutdown();
+            sessionStore.close();
+          })();
+        }
+        return cleanupPromise;
       };
 
-      process.on('SIGINT', () => {
-        cleanup();
-        process.exit(0);
-      });
+      const signalHandler = (signal: NodeJS.Signals) => {
+        console.log(`\nReceived ${signal}; shutting down TUI...`);
+        void cleanup()
+          .then(() => process.exit(0))
+          .catch((error) => {
+            console.error('TUI shutdown failed:', error);
+            process.exit(1);
+          });
+      };
+
+      process.on('SIGINT', signalHandler);
+      process.on('SIGTERM', signalHandler);
 
       const transferSessionToTarget = (target: string): string => {
         const normalizedTarget = target.trim().toLowerCase();
@@ -274,7 +288,9 @@ export function registerTuiCommand(program: Command): void {
           modelProviderConfigs,
           contextThresholdPct: config.compaction.threshold_pct,
           onTransfer: transferSessionToTarget,
-          onExit: cleanup,
+          onExit: () => {
+            void cleanup();
+          },
         });
       } else {
         let switchingToFullscreen = false;
@@ -316,12 +332,16 @@ export function registerTuiCommand(program: Command): void {
             modelProviderConfigs,
             contextThresholdPct: config.compaction.threshold_pct,
             onTransfer: transferSessionToTarget,
-            onExit: cleanup,
+            onExit: () => {
+              void cleanup();
+            },
           });
           return;
         }
       }
 
-      cleanup();
+      await cleanup();
+      process.off('SIGINT', signalHandler);
+      process.off('SIGTERM', signalHandler);
     });
 }