The packaged desktop "Local" runtime dynamically imports @fusion/engine, whose
tsc dist is gitignored. desktop-windows.yml built only `@fusion/desktop build`
(no root `pnpm build`), so it packaged an empty engine/dist and the app crashed
on Local mode with ERR_MODULE_NOT_FOUND for app.asar/node_modules/@fusion/engine.
Make the desktop build self-contained (build core then engine before packaging)
and add the parity `pnpm build` step to desktop-windows.yml.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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