Identity + setup readiness + live activity for the swarm dashboard

Single source of truth consumed by the UI home page. Identity comes from SWARM_* envs; setup milestones each emit unverified | configured | verified; automations report running | needs_setup from the same runtime preflight used at dispatch; activity counts agents alive in the last 5 min, leads that can take work (status idle or busy), and tasks created in the last 24h; agent_fs reports whether AGENT_FS_API_URL is set, plus the Comb settings (whether Files is on and, when off, what is missing; the browser-facing agent-fs URL, the shared org and drive ids, and the agent-fs user id of the swarm service account); telemetry reports the effective ANONYMIZED_TELEMETRY opt-out state.