chore(web): drop probe button and footer rail

The 15 s health poll stays; the manual trigger and the rtt/poll-note
footer earned nothing over it.

Closes #106

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

web/index.html

@@ -18,11 +18,10 @@
     fault red) with a soft glow, phosphor-cyan for the one interactive control.
     STORY: the operator opens the board, reads the master lamp, and knows in a
     second whether arr can do its job — and which upstream is down, by name.
-    FIRST VIEWPORT: a top rail (wordmark + master lamp + verdict + version +
-    PROBE control), then the chain: TMDB and PROWLARR modules on the left
-    feeding the central arr module, TRANSMISSION driven on the right, joined by
-    bus hairlines with direction arrows. Footer rail carries the round-trip
-    readout. On a phone the chain stacks vertically.
+    FIRST VIEWPORT: a top rail (wordmark + master lamp + verdict + version),
+    then the chain: TMDB and PROWLARR modules on the left feeding the central
+    arr module, TRANSMISSION driven on the right, joined by bus hairlines with
+    direction arrows. On a phone the chain stacks vertically.
     FORM: broadcast master-control panel, #2 of 7 on the ordered list; external
     roll (shell RANDOM → 2, witness 57910; concept-seed.mjs degraded to empty
     output in this environment).
@@ -93,7 +92,6 @@
       <p class="rail-verdict readout" id="master-verdict" role="status">probing chain…</p>
       <div class="rail-meta">
         <span class="readout dim" id="version" data-testid="version">v —</span>
-        <button type="button" class="control" id="probe">probe</button>
       </div>
     </header>
 
@@ -331,9 +329,5 @@
       </section>
     </main>
 
-    <footer class="rail rail-foot">
-      <span class="readout dim" id="roundtrip">rtt —</span>
-      <span class="readout dim" id="poll-note">repolls every 15 s</span>
-    </footer>
   </body>
 </html>