Show last run timestamp on ops automation status

Expose last_run_at / last_run on the status contract and display Last run
and Tasks columns on the /ops/ui status page for the selected window.

src/activity_core/ops_api.py

@@ -402,11 +402,27 @@ async def ui_status(since: str = Query(default="sunday")) -> HTMLResponse:
             "status-bad" if st in {"missed", "validation_failed", "sink_failed"} else "status-warn"
         )
         aid = html.escape(str(a.get("id") or ""))
+        last_run = a.get("last_run") or {}
+        last_at = (
+            a.get("last_run_at")
+            or last_run.get("fired_at")
+            or a.get("temporal_last_fired_at")
+            or "—"
+        )
+        last_tasks = last_run.get("tasks_spawned")
+        last_tasks_s = "" if last_tasks is None else str(last_tasks)
+        run_count = a.get("observed_run_count", a.get("run_count", a.get("runs_count", "")))
+        expected_n = a.get("expected_fire_count")
+        if expected_n is None:
+            expected_n = len(a.get("expected_fires") or a.get("expected") or [])
         rows.append(
             f"<tr><td><a href='/ops/ui/automations/{aid}'>{html.escape(str(a.get('name')))}</a></td>"
             f"<td class='{cls}'>{html.escape(st)}</td>"
-            f"<td>{html.escape(str(a.get('run_count', a.get('runs_count', ''))))}</td>"
-            f"<td>{html.escape(str(len(a.get('expected_fires') or a.get('expected') or [])))}</td>"
+            f"<td title='latest fire in selected window (or Temporal last action)'>"
+            f"<code>{html.escape(str(last_at))}</code></td>"
+            f"<td>{html.escape(last_tasks_s)}</td>"
+            f"<td>{html.escape(str(run_count))}</td>"
+            f"<td>{html.escape(str(expected_n))}</td>"
             f"<td>{html.escape(str(a.get('enabled')))}</td></tr>"
         )
     window = html.escape(json.dumps(report.get("window") or {}, indent=2))
@@ -418,11 +434,16 @@ async def ui_status(since: str = Query(default="sunday")) -> HTMLResponse:
     <label>since <input type="text" name="since" value="{html.escape(since)}"/></label>
     <button type="submit">Refresh</button>
   </form>
+  <p class="muted">Last run = newest <code>fired_at</code> in the selected window
+  (falls back to Temporal schedule last action when no DB run is in-window).</p>
   <pre>window: {window}</pre>
   <pre>summary: {summary}</pre>
   <table>
-    <thead><tr><th>Name</th><th>Status</th><th>Runs</th><th>Expected</th><th>Enabled</th></tr></thead>
-    <tbody>{''.join(rows) or '<tr><td colspan="5">No activities</td></tr>'}</tbody>
+    <thead><tr>
+      <th>Name</th><th>Status</th><th>Last run</th><th>Tasks</th>
+      <th>Runs</th><th>Expected</th><th>Enabled</th>
+    </tr></thead>
+    <tbody>{''.join(rows) or '<tr><td colspan="7">No activities</td></tr>'}</tbody>
   </table>
 """
     return _page("Status", body)