fix(cli): pause stdin in selector cleanup to prevent process hang

After resume()ing stdin for raw-mode input, the stream stays in
flowing mode and keeps the Node.js event loop alive. Calling
input.pause() in cleanup() restores stdin to paused mode so the
process exits normally after the user confirms a model selection.

Author: linuxdevel

packages/cli/src/commands/change-model.ts

@@ -163,6 +163,7 @@ async function runSelector(
     const cleanup = (): void => {
       input.removeListener("data", onData);
       (input as NodeJS.ReadStream).setRawMode?.(false);
+      input.pause();
     };
 
     // Attach listener first, then resume — ensures no data events are missed.