Main built-in view: the fused control plane at `/` and `/view/fleet` (node cards with machine + actor rollup, per-node roster, per-actor dossier via `/api/view/fleet/detail`), backed by `host.*`, `proc.<label>.lifecycle`, `runtime.stats`, and `runtime.actors` frames when present. It is a pure frame consumer, tolerant of publisher shape. Message history is folded view-side from `messages_processed` deltas — no producer changes. The unified navbar is injected server-side from the view registry; pages opt in with a `<!--swactor:nav-->` placeholder.