fix: update wiki-sync workflow to use PR instead of direct push

[NormB]

Problem

The Wiki Sync workflow was failing with repository rule violations:

• ❌ Changes must be made through a pull request
• ❌ Commits must have verified signatures
• ❌ Push declined due to repository rule violations

Solution

Modified the workflow to:

• ✅ Use action instead of direct push
• ✅ Create automated PRs for wiki changes
• ✅ Respect branch protection rules
• ✅ Add proper labels (documentation, automated)

Changes

# Before: Direct push (violates rules)
git push

# After: Create PR (respects rules)
uses: peter-evans/create-pull-request@v6

Testing

This PR will test the fix when merged to main. The workflow will:

1. Detect documentation changes
2. Create an automated PR for wiki sync
3. Respect all repository protection rules

Impact

• Fixes CI/CD failure in Wiki Sync workflow
• Aligns with repository security policies
• Maintains automated wiki synchronization