hive-c0re, docs: sweep remaining stale ask/answer-dashboard references

docs/web-ui/dashboard.md

@@ -1172,13 +1172,6 @@ below — some endpoints aren't in it yet.
 - `POST /api/{rebuild,kill,restart,start,destroy}/{name}` — lifecycle.
   `destroy` accepts `purge=on` to also wipe state dirs.
 - `POST /api/purge-tombstone/{name}` — wipe a tombstone's state dirs.
-- `POST /api/answer-question/{id}` — answer a pending operator question.
-  No dashboard UI calls this any more (the questions pane is gone —
-  see hyperhive#3721); kept as long as the backend `ask`/`answer`
-  mechanism itself still exists.
-- `POST /api/cancel-question/{id}` — cancel a pending question with
-  the sentinel `[cancelled]`. Same code path as a real answer. Same
-  no-UI-consumer note as above.
 - `POST /api/request-spawn` — queue a Spawn approval.
 - `POST /api/update-all` — rebuild every stale container.
 - `POST /api/rebuild-queue/{id}/cancel` — drop a `Queued` entry.
@@ -1383,12 +1376,6 @@ payload):
   sha_short, status, resolved_at, note, description) — pending
   queue + history mutations. Client mutates a derived store and
   re-renders only the approvals section.
-- `question_added` (id, asker, question, options, multi,
-  asked_at, deadline_at, target) / `question_resolved` (id,
-  answer, answerer, answered_at, cancelled, target) — still
-  fired by the backend `ask`/`answer` mechanism, but the
-  dashboard no longer subscribes to either kind: the questions
-  pane that used to surface them is gone (hyperhive#3721).
 - `transient_set` (name, transient_kind, since_unix) /
   `transient_cleared` (name) — lifecycle action spinners. The
   client ticks the elapsed-seconds badge off `since_unix`