[Bug] macOS packaged node-pty doubles app.asar.unpacked path, terminal posix_spawn ENOENT

[lyc10031]

Environment

• DSH Desktop 0.10.0 (macOS arm64, packaged app)
• Bundled Harness 0.1.7-rc.2
• Bundled node-pty@1.2.0-beta.15
• This happened before installing dsh-better-sidebar or dsh-remote-ssh, and also reproduces with those plugins bypassed.

Symptom

Opening the built-in terminal reports:

Terminal error: posix_spawn failed: No such file or directory

Root cause / isolated reproduction

The packaged node-pty/lib/unixTerminal.js computes helperPath from native.dir, then applies:

helperPath = helperPath.replace('app.asar', 'app.asar.unpacked');

In this build, node-pty is already under Resources/app.asar.unpacked/node_modules/. This transforms a valid path containing app.asar.unpacked into app.asar.unpacked.unpacked.

With the same native module, /bin/bash, working directory, and environment, passing the computed path to pty.fork gives posix_spawn failed: No such file or directory; passing the actual existing prebuilds/darwin-arm64/spawn-helper path succeeds and returns a PID and FD. This isolates the error to the helper path, not the shell, cwd, or Remote SSH plugin.

// Run using macOS Node against the packaged DSH Desktop node-pty:
const path = require('node:path');
const fs = require('node:fs');
const root = '/Applications/DSH Desktop.app/Contents/Resources/app.asar.unpacked/node_modules/node-pty';
const native = require(root + '/lib/utils.js').loadNativeModule('pty');
const actual = path.resolve(root + '/lib', native.dir + '/spawn-helper');
const computed = actual.replace('app.asar', 'app.asar.unpacked')
  .replace('node_modules.asar', 'node_modules.asar.unpacked');
console.log(fs.existsSync(actual), fs.existsSync(computed)); // true false
const args = ['/bin/bash', [], ['TERM=xterm-256color', 'HOME=' + process.env.HOME,
  'PATH=/usr/bin:/bin'], process.env.HOME, 80, 24, -1, -1, true];
native.module.fork(...args, computed, () => {}); // ENOENT
// In a separate run: native.module.fork(...args, actual, () => {}) succeeds.

Expected

Opening the native terminal starts a shell. Please avoid re-rewriting app.asar.unpacked (e.g. replace only the exact app.asar/ path segment, or avoid this rewrite when the module is already unpacked), and add a packaged macOS PTY smoke test. No app files were modified during diagnosis.