docs: update documentation to OKF v0.1 format

docs/guides/event-window.md

@@ -53,9 +53,17 @@ shape.
 # Frontend wiring
 
 The authenticated shell subscribes to `/api/v1/events/status` from
-`HomeComponent.ngOnInit()` via `EventStatusStore.start(() => new EventSource('/api/v1/events/status', { withCredentials: true }))`
+`HomeComponent.ngOnInit()` through `AuthenticatedEventSourceService.open()` and
+`EventStatusStore.start(...)`
 (`frontend/src/app/features/home/home.component.ts`,
-`frontend/src/app/core/services/event-status.store.ts`). The store:
+`frontend/src/app/core/services/authenticated-event-source.service.ts`,
+`frontend/src/app/core/services/event-status.store.ts`). The transport uses a
+fetch stream rather than the browser `EventSource` API because it must attach the
+JWT `Authorization` header. It sends `Accept: text/event-stream`, includes
+credentials, parses streamed SSE records, buffers early frames, and aborts the
+request on `close()`.
+
+The store:
 
 1. Calls `applyServerStatus(payload)` on every `message` frame (parses
    JSON, sets `state`, `serverNowUtc`, `eventStartUtc`, `eventEndUtc`,