fix: run opencode server through shell on Windows

[Loues000]

Summary

Fix OpenCode server startup on Windows when the resolved OpenCode binary is a .cmd shim.

Node cannot spawn .cmd files directly with shell: false, which can make the opencode serve process fail with EINVAL on Windows. The existing OpenCode healthcheck already uses shell: process.platform === win32 for this reason.

This PR applies the same Windows-only spawn behavior to the long-running OpenCode server process. Linux and macOS behavior is unchanged.

Fix

• Add shell: process.platform === win32 to the opencode serve spawn options in opencodeRuntime.ts
• Keep the change scoped to the OpenCode server startup path
• No UI changes

Test plan

• bun fmt
• bun lint
• bun typecheck

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Note

Low Risk
Small, Windows-only process spawn option change; behavior on macOS/Linux is unchanged and impact is limited to OpenCode server startup.

Overview
Fixes OpenCode server startup on Windows by spawning the long-running opencode serve process with shell: process.platform === "win32", matching the behavior already used for other command executions.

Non-Windows platforms keep the existing spawn behavior; only the server startup path in opencodeRuntime.ts is affected.

^{Reviewed by Cursor Bugbot for commit b81aacc. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix OpenCode server process spawn on Windows by running through a shell

On Windows, spawning a child process without a shell can fail for certain executables. The fix sets shell: process.platform === "win32" in the options passed to ChildProcess.make in opencodeRuntime.ts. Non-Windows behavior is unchanged.

^{Macroscope summarized b81aacc.}

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[macroscopeapp]

Approvability

Verdict: Approved

Single-line fix adding standard Windows shell spawning pattern for child process execution. This is a common, well-understood platform compatibility fix with minimal risk.

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[gameroman]

Duplicate of #2183