test: add container lifecycle, federation join/sync tests to cross-node suite
- TEST-03: US-02 container lifecycle — stop filebrowser, verify health monitor
auto-restarts within 90s (40s on .228, 15s on .198)
- TEST-04: US-03 federation join — verify peers present, trust level, DID, last_seen
- TEST-05: US-04 federation sync — trigger sync, verify app counts, freshness
- Fix: updated stale onion addresses in federation nodes.json on both servers
after Tor address rotation broke inter-node sync
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>