~anthropic/claude-sonnet-latest → B (70:30)

Side B fixes a real tokio RwLock re-entrancy deadlock bug in the RPC handler, adds an integration test covering RoomCreate, and hardens babashka test infra (HTTP timeouts, log redirection to avoid pipe deadlocks) plus corrects test assertions to match actual stored username format. Side A is purely a planning document and a thin wrapper struct (RouteContext) that just delegates to existing ThreadNav methods without migrating any call sites, providing no functional change or bugfix.