slash command rerun UX: emoji semantics + result writeback (#24802)

.github/workflows/rerun-test.yml

@@ -44,6 +44,16 @@ on:
         required: false
         type: string
         default: "false"
+      reply_comment_id:
+        description: "Reply comment ID to write back result to"
+        required: false
+        type: string
+        default: ""
+      reply_marker:
+        description: "Per-batch marker for locating the line in reply comment"
+        required: false
+        type: string
+        default: ""
 
 env:
   SGLANG_IS_IN_CI: true
@@ -196,3 +206,40 @@ jobs:
           done
           total_elapsed=$(( SECONDS - suite_start ))
           echo "All $total test(s) passed in ${total_elapsed}s"
+
+  write-back-result:
+    needs: [rerun-test-cuda, rerun-test-cpu]
+    if: always() && inputs.reply_comment_id != '' && inputs.reply_marker != ''
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    concurrency:
+      group: rerun-test-writeback-${{ inputs.reply_comment_id }}
+      cancel-in-progress: false
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
+
+      - name: Install dependencies
+        run: pip install requests
+
+      - name: Write back result to reply comment
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          if [[ "${{ needs.rerun-test-cuda.result }}" == "success" || "${{ needs.rerun-test-cpu.result }}" == "success" ]]; then
+            STATUS=success
+          else
+            STATUS=failure
+          fi
+          python3 scripts/ci/utils/write_rerun_test_result.py \
+            --comment-id "${{ inputs.reply_comment_id }}" \
+            --marker "${{ inputs.reply_marker }}" \
+            --status "$STATUS" \
+            --repo "${{ github.repository }}"