Add Delete and Run Again buttons to run detail page

- Add "Run Again" button that reruns the recipe with same parameters
- Add "Delete" button with confirmation to delete run and artifacts
- Consolidate result display into single #action-result span
- Implement POST /runs/rerun/{recipe_id} endpoint

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/templates/runs/detail.html

@@ -29,12 +29,26 @@
         <span class="text-red-400 text-sm ml-2">{{ run.error }}</span>
         {% endif %}
         <div class="flex-grow"></div>
+        {% if run.recipe %}
+        <button hx-post="/runs/rerun/{{ run.recipe }}"
+                hx-target="#action-result"
+                hx-swap="innerHTML"
+                class="bg-blue-600 hover:bg-blue-700 px-3 py-1 rounded text-sm font-medium">
+            Run Again
+        </button>
+        {% endif %}
         <button hx-post="/runs/{{ run.run_id }}/publish"
-                hx-target="#share-result"
+                hx-target="#action-result"
                 class="bg-purple-600 hover:bg-purple-700 px-3 py-1 rounded text-sm font-medium">
             Share to L2
         </button>
-        <span id="share-result"></span>
+        <button hx-delete="/runs/{{ run.run_id }}/ui"
+                hx-target="#action-result"
+                hx-confirm="Delete this run and all its artifacts? This cannot be undone."
+                class="bg-red-600 hover:bg-red-700 px-3 py-1 rounded text-sm font-medium">
+            Delete
+        </button>
+        <span id="action-result"></span>
     </div>
 
     <!-- Info Grid -->