0.82.0

test(e2e): say why a launch never got a backend

launchApp's "did not become ready within 120000ms" was all CI shard 2 had
to offer when lad-export.spec.ts failed at 0ms on run 34081346174 — a
first-time failure with nothing to chase, and no way to tell a crashed
sidecar from a taken port from a supervisor that stood down.

The main process routes console.* through electron-log, so its stdout is
empty; the record is the per-session file logger.ts names with the main
process's pid, and the sidecar's own log beside it under the same tag. On a
readiness timeout, attach the tails of both. Verified by forcing the
supervisor to stand down: the error now carries its own warning line and
reports the sidecar log as never written.