Add Windows ZCode discovery and app-server launch support

[jzhishu]

What problem are you trying to solve?

PR #4819 adds the first pass of ZCode support for Open Design, scoped to the verified macOS install path.

On macOS, OD can discover or let users select ZCode.app, then launch the bundled app-server entrypoint:

ZCode.app/Contents/Resources/glm/zcode.cjs app-server

Windows support is not included yet because the Windows install layout and app-server entrypoint have not been verified. Without that follow-up, Windows users may not be able to use ZCode from OD even after the macOS integration lands.

Describe the solution you'd like

Add Windows support for ZCode discovery and app-server launch.

This should verify the Windows install layout, identify the correct app-server entrypoint, and wire that path into OD's runtime detection, connection test, and run flow.

Acceptance criteria:

• OD can auto-detect a standard Windows ZCode install.
• OD can launch ZCode app-server on Windows.
• ZCode connection test works on Windows.
• ZCode runs can stream events into OD chat on Windows.
• If manual selection is needed, Settings exposes a Windows-appropriate picker.
• Tests cover Windows path resolution without depending on a real local install.

Alternatives you've considered

I considered keeping Windows support in #4819, but that PR is already a complete macOS-scoped implementation. The Windows install layout and app-server entrypoint still need separate verification, so handling it as a follow-up should keep the current PR reviewable and avoid guessing at Windows paths.

Additional context

Related:

• Follow-up from feat: add macOS ZCode runtime support #4819
• Original request: Feature request: Add support for zcode (Zhipu AI CLI) #4692

Things to verify:

• Where ZCode installs on Windows.
• Whether Windows ships a public CLI, an .exe, a .cmd, or a bundled zcode.cjs.
• The Windows equivalent of the app-server launch command.
• Where ZCode stores saved provider/model configuration on Windows.
• Whether the existing ZCode saved config reader works unchanged on Windows.
• What Settings UX should look like on Windows.

Would you be willing to contribute a PR?

Yes, I can take this on

[lefarcen]

Hi @jzhishu — thanks for splitting this out from #4819 with the Windows-specific scope already called out.

The acceptance criteria here are clear, especially the parts around verifying the Windows install layout, the app-server entrypoint, and keeping path-resolution tests independent from a real local install. We’ve routed this to @811634243-sketch for product direction, and you should usually hear back within about 12 hours.

[github-actions]

This issue has been inactive for 30 days and is being marked as stale. If it is still relevant, please leave a comment or push an update — otherwise it will be closed in 7 days.

This is only a queue-management step, not a rejection of the report. Closed issues can be reopened when work resumes.

[lefarcen]

Heads-up: this is still being tracked by PR #4819, so I’m removing the stale label.

That PR is still open and currently has requested changes on the latest head, so this issue should stay open as the follow-up tracker until the implementation path moves again.