Replace the prebuilt Debian package with the documented source build. Build the web UI and gateway with pnpm, stage the pinned Cua driver, and start the web UI from the wrapper.
Package the upstream Linux Electron release for x86_64 and aarch64 as
pilotdeck. The Debian payload includes the bundled Node.js runtime and web
UI; the wrapper adds the Electron runtime libraries to LD_LIBRARY_PATH and
installs a desktop entry.
README lists the new package.
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