drop hive and agent response fields the frontend never reads

docs/4-implementation/web-ui/shape.md

@@ -39,15 +39,12 @@
   XSS-safe by construction the way the text-node `linkify` path is.
   Rendered `<a>`s are rewritten to `target="_blank"`.
 - `GET /api/state` → JSON snapshot the JS app renders into the
-  DOM. Includes a top-level `seq` (the dashboard event channel's
-  high-water mark at the moment the server assembled the snapshot);
-  clients use it to dedupe their buffered SSE traffic against
-  the snapshot (drop frames with `seq <= snapshot.seq`).
+  DOM.
 - `GET /api/dashboard/stream` (dashboard) / `GET /events/stream`
   (per-agent) → `text/event-stream` SSE for live updates. The
   dashboard stream carries broker `Sent` / `Delivered` (mirrored
   by a forwarder task from the broker's intra-process channel)
-  plus mutation events (`transient_set` / `transient_cleared`). Each frame carries a `seq`. The
+  plus mutation events (`transient_set` / `transient_cleared`). The
   agent's matching backfill endpoint is `GET /events/history` (last 2000
   `LiveEvent`s wrapped in `{ seq, events }`).
   **One unified channel**: browsers cap concurrent SSE