Engine closure for DSH Desktop — upstream 477b4f420553e8a52c2fbccc464d7561b239c443 (dsh-v0.1.7-rc.2). Assets: one dsh-engine--.tar.gz per platform (win32-x64, darwin-x64, darwin-arm64) plus engine-manifest.json. Installed desktop apps pick this build up automatically through the engine channel — no desktop rebuild is required.