The backend buckets and records hermes.startup.latency, but only the clients
know when they were launched. The Ink TUI reports Node process uptime at its
first gateway.ready; Desktop reports Electron main-process uptime when the
renderer's gateway first connects. The Desktop latch lives in the main process
because renderer reloads, extra windows and backend reconnects all re-run the
renderer boot. Both calls are fire-and-forget and swallow errors so older
backends without the method are unaffected.
ce80e8d81a