fix: Add permissions and continue-on-error for PR comment step

- Add pull-requests: write permission to allow commenting
- Add continue-on-error: true so comment failure doesn't fail workflow

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

Author: dshkol

.github/workflows/validate_examples.yml

@@ -9,6 +9,10 @@ on:
     # Run weekly on Mondays at 9 AM UTC
     - cron: '0 9 * * 1'
 
+permissions:
+  contents: read
+  pull-requests: write
+
 jobs:
   validate:
     runs-on: ubuntu-latest
@@ -71,6 +75,7 @@ jobs:
 
     - name: Comment PR with results
       if: github.event_name == 'pull_request'
+      continue-on-error: true
       uses: actions/github-script@v6
       with:
         script: |