ci: 🐛 exclude merge commits from commit message validation

Add --no-merges flag to git log to skip auto-generated merge commits
from GitHub that don't follow conventional commit format.

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

Author: jorben

.github/workflows/ci.yml

@@ -20,8 +20,9 @@ jobs:
       - name: Validate commit message
         run: |
           # Get commit message(s) to validate
+          # Use --no-merges to exclude merge commits (auto-generated by GitHub)
           if [ "${{ github.event_name }}" = "pull_request" ]; then
-            COMMITS=$(git log --format=%s origin/${{ github.base_ref }}..HEAD)
+            COMMITS=$(git log --no-merges --format=%s origin/${{ github.base_ref }}..HEAD)
           else
             COMMITS=$(git log -1 --format=%s)
           fi