ask_operator tool: non-blocking; operator answer arrives as helper event

new mcp tool on the manager surface that queues a question on the
dashboard and returns the question id immediately. operator submits an
answer via /answer-question/<id>; the dashboard fires
HelperEvent::OperatorAnswered { id, question, answer } into the manager
inbox so the next turn picks it up.

also: fix async-form button stuck on spinner after successful submit
(refreshState skipped re-rendering, so the button was never re-enabled).

hive-c0re/assets/index.html

@@ -16,6 +16,12 @@
     <p class="meta">loading…</p>
   </div>
 
+  <h2>◆ M1ND H4S QU3STI0NS ◆</h2>
+  <div class="divider">══════════════════════════════════════════════════════════════</div>
+  <div id="questions-section">
+    <p class="meta">loading…</p>
+  </div>
+
   <h2>◆ 0PER4T0R 1NB0X ◆</h2>
   <div class="divider">══════════════════════════════════════════════════════════════</div>
   <div id="inbox-section">