Desktop v1.14.39: Bun-target plugins fail to load (Node.js sidecar lacks Bun APIs) #25880

Description

OpenCode Desktop v1.14.30 → v1.14.39 update: the sidecar runtime switched from Bun to Node.js/Electron's bundled Node.js. This breaks all third-party plugins built with --target bun, because they depend on Bun-specific APIs such as globalThis.Bun.spawn, Bun.file, Bun.serve, Bun.which, etc.

Reproduction

1. Install OpenCode Desktop v1.14.39
2. Add a Bun-built plugin to config, e.g. oh-my-openagent@latest
3. Start Desktop → sidecar crashes, logs show:
   • Cannot destructure property 'spawn' of 'globalThis.Bun' as it is undefined
   • Or 0-byte sidecar log files

Affected Plugins

• oh-my-openagent (v3.17.14): uses Bun.spawn, Bun.file, Bun.write, Bun.which, Bun.serve, Bun.hash, Bun.readableStreamToText
• opencode-pty: depends on bun-pty native module (cannot work in Node.js)
• @tarquinen/opencode-dcp: ESM directory import resolution issue

Workaround (temporary)

A Bun → Node.js polyfill can be injected at the top of the cached plugin file to fix oh-my-openagent, but it's fragile:

• It gets overwritten when Desktop re-downloads the plugin
• Some plugins (opencode-pty) use native Bun addons and cannot be polyfilled

Suggested Fix

1. Restore Desktop sidecar to use Bun runtime, or
2. Provide a config option to select sidecar runtime (Bun / Node.js), or
3. Ship a Bun API polyfill layer in Desktop's Node.js sidecar

Related Issues

• v1.14.32 regression: plugin agents and MCPs silently fail to register (ALS context lost during InstanceStore.boot) #25457 v1.14.32 regression: plugin agents and MCPs silently fail to register
• Version v1.14.35 is unable to load OMO normally again #25799
• v1.14.35 Desktop shows plugin loaded, but oh-my-openagent custom agents not visible in GUI (TUI works when launched from same exe) #25824
• After update to v.14.37, in desktop app. Agent not showing up the plugin list. In CLI it is working fine. #25840

Environment

• OS: Windows 11
• OpenCode Desktop: 1.14.39
• OpenCode CLI: 1.14.39 (via Bun, works fine)
• Node.js: bundled with Desktop