feat: add isolated historical replay calibration

public/admin/assets/js/autonomy.js

@@ -79,6 +79,12 @@
     byId("perf-cohorts").textContent = formatNumber(data.calibration?.length || 0);
     if (outcomes) byId("performance-note").textContent = `Measured on ${outcomes} matured predictions. Results remain descriptive until the sample is large enough for stable calibration.`;
 
+    const replay = data.replay;
+    byId("replay-status").textContent = replay ? replay.status : "Not started";
+    byId("replay-articles").textContent = replay ? formatNumber(replay.processed_articles || 0) : "—";
+    byId("replay-evaluations").textContent = replay ? formatNumber(replay.evaluations || 0) : "—";
+    byId("replay-watermark").textContent = replay?.watermark_at ? formatRelative(replay.watermark_at) : "—";
+
     byId("runtime-queue").textContent = `${formatNumber(pendingHistorical, true)} pending`;
     byId("runtime-coordinator").textContent = pendingHistorical ? "Processing" : "Watching";
     if (data.account) {

public/admin/pages/autonomy.html

@@ -128,6 +128,16 @@
       </div>
     </aside>
   </div>
+
+  <section class="panel" aria-label="Historical replay">
+    <div class="section-head"><div><span class="section-index">06</span><h3>Historical replay</h3></div><span class="mode-pill">Isolated from execution</span></div>
+    <div class="performance-facts">
+      <div><span>Run state</span><strong id="replay-status">Starting…</strong></div>
+      <div><span>Articles replayed</span><strong id="replay-articles">—</strong></div>
+      <div><span>Walk-forward evaluations</span><strong id="replay-evaluations">—</strong></div>
+      <div><span>Watermark</span><strong id="replay-watermark">—</strong></div>
+    </div>
+  </section>
 </main>
 
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