fix(install.ps1): 原生命令 stderr 在 Stop 下误抛 NativeCommandError

[bigbrother666sh]

用户 Win 实测 install.ps1 卡在 Installing python skill deps：

python.exe : ... NativeCommandError ... RemoteException
+     & python -m pip install --user $merged 2>&1 | ForEach-Object { Wr ...

根因：脚本顶部 $ErrorActionPreference="Stop" + 原生命令 2>&1 合并进管道 → stderr 行变 ErrorRecord → Stop 当 terminating error 抛 NativeCommandError/RemoteException。pip install 正常把进度条/警告写 stderr，所以一跑就炸。

修法：加 Invoke-Streamed helper，临时切 $ErrorActionPreference='Continue' 跑原生命令并按行回显 stdout+stderr，$LASTEXITCODE 仍由调用方判成败。替换 6 处 2>&1 | ForEach-Object { Write-Host } 调用点：pip / camoufox-cli install / openclaw plugins install / daemon install / gateway restart×2。

其余原生调用（pnpm/npm/bash/tar/channels login）未走 2>&1，stderr 直写控制台不触发 Stop，不动。

install.ps1 走 raw URL 拉取（irm raw.githubusercontent.com/.../master/scripts/install.ps1 | iex），合到 master 即生效，无需重建 tarball。

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

codes-factory-of-bg seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}