chore(ci): consolidate Dependabot directories and pin GitHub Actions in workflow automation (#6172)

.github/workflows/ai-engine.yml

@@ -5,6 +5,9 @@ on:
     branches: [main]
   pull_request:
 
+permissions:
+  contents: read
+
 jobs:
   engine:
     runs-on: ubuntu-latest
@@ -12,11 +15,16 @@ jobs:
       contents: read
       pull-requests: write
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@8d3c67de8e2fe68ef647c8db1e6a09f647780f40 # v2.19.0
+        with:
+          egress-policy: audit
+
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v4
+        uses: astral-sh/setup-uv@38f3f104447c67c051c4a08e39b64a148898af3a # v4.2.0
         with:
           enable-cache: true
 
@@ -60,7 +68,7 @@ jobs:
       - name: Comment on fixer failures
         if: steps.fixer_changes.outcome == 'failure' && github.event_name == 'pull_request'
         continue-on-error: true
-        uses: actions/github-script@v7
+        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7.1.0
         with:
           script: |
             const marker = '<!-- engine-check -->';