Ninth main.cjs cluster peel. The hermes:version handler moves verbatim into
electron/version-ipc.cjs behind a registerVersionIpc({ ipcMain,
resolveHermesVersion, resolveUpdateRoot }) registrar. The version + root resolvers
stay in the main process (shared with the About menu) and are injected.
Channel name unchanged → preload + renderer untouched. Adds
electron/version-ipc.test.cjs (surface + payload behavior).
