Fix Copilot CLI /remote command (#313377)

* fix: handle Copilot CLI remote command

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add remote control QR code

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Enable remote command by default

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Improve remote control QR response

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Polish remote control QR presentation

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Isolate remote command stream

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix remote steering mode handling

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Keep interrupted output on original stream

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Mark interrupted local command responses

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Handle closed interrupted streams

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Preserve responses during local steering

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Polish remote control banner copy

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Use lowercase mobile in remote banner

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Avoid remote QR dependency

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix remote config CI

Restore the Copilot extension lockfile to avoid fork dependency checks and keep the remote setting tagged for the advanced configuration section test.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix Copilot CLI node-pty shim

Support node-pty's prebuilds layout when build/Release is absent so the Copilot CLI SDK can initialize in Code OSS dev builds.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>