Plan

Move the overlay queries (adapter_for_kind, screen_rules, detect_kind) onto an Overlays value; Ctx holds RwLock<Arc<Overlays>> and hands out snapshots, so a reload swaps the Arc and every caller reads one consistent set. load_overlays returns the overlays plus per-file failures. Add agents.list / agents.reload handlers, proto constants, docs/08 rows and CLI commands. Test-first through IPC. Claude implements; Gemini reviews read-only.