Safely kill processes

src/cli.ts

@@ -148,13 +148,21 @@ async function main() {
     process.stdin.resume();
     if (pty) {
       // Resume child process first
+      try {
         process.kill(pty.pid, "SIGCONT");
+      } catch {
+        // Child may have already exited
+      }
       // Give child time to wake up, then trigger redraw
       setTimeout(() => {
         if (pty && !isExiting) {
           const { cols, rows } = getTerminalSize();
           pty.resize(cols, rows);
-          process.kill(pty.pid, "SIGWINCH"); // Tell child window changed
+          try {
+            process.kill(pty.pid, "SIGWINCH");
+          } catch {
+            // Child may have already exited
+          }
         }
       }, 50);
     }
@@ -187,7 +195,11 @@ async function main() {
           process.stdin.setRawMode(false);
         }
         if (pty) {
+          try {
             process.kill(pty.pid, "SIGTSTP");
+          } catch {
+            // Child may have already exited
+          }
         }
         process.kill(process.pid, "SIGTSTP");
         return;