Adds tests/multinode/smoke.sh on the existing multinode.bash lib: an
assertion suite (pass/fail + non-zero exit) driving two real nodes through
login, onion + FIPS identity, FIPS anchor-connected, federation pairing
both directions, peer content browse over the mesh, and the removed-node
tombstone (with an optional 3rd node C for the transitive-reappear case).
Guards the v1.7.94/v1.7.95 fixes. Content-browse + tombstone checks
skip-with-note against peers older than v1.7.95.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
0c8991b519