feat(tui): single ctrl+c clears input, double ctrl+c exits

src/cli/tui.ts

@@ -238,7 +238,30 @@ export function registerTuiCommand(program: Command): void {
         return cleanupPromise;
       };
 
+      let activeCtrlCHandler: (() => boolean) | null = null;
+      let lastCtrlCAtMs = 0;
+      const ctrlCExitWindowMs = 1_500;
+
       const signalHandler = (signal: NodeJS.Signals) => {
+        if (signal === 'SIGINT' && activeCtrlCHandler) {
+          // Minimal TUI owns Ctrl+C behavior via readline SIGINT handling.
+          return;
+        }
+
+        if (signal === 'SIGINT') {
+          const now = Date.now();
+          const isDoublePress = lastCtrlCAtMs > 0 && (now - lastCtrlCAtMs) <= ctrlCExitWindowMs;
+          lastCtrlCAtMs = now;
+
+          if (!isDoublePress) {
+            if (activeCtrlCHandler && !activeCtrlCHandler()) {
+              return;
+            }
+            console.log('\nPress Ctrl+C again to quit (or use /quit).');
+            return;
+          }
+        }
+
         console.log(`\nReceived ${signal}; shutting down TUI...`);
         void cleanup()
           .then(() => process.exit(0))
@@ -313,8 +336,10 @@ export function registerTuiCommand(program: Command): void {
             tui.stop(true);
           },
         });
+        activeCtrlCHandler = () => tui.handleCtrlCPress();
 
         await tui.start();
+        activeCtrlCHandler = null;
 
         if (switchingToFullscreen) {
           console.clear();