fix(sync): add business-growth and finance domains, fix main branch protection

- Add business-growth and finance to SKILL_DOMAINS in sync-codex-skills.py
- Create symlinks for 5 new skills (customer-success-manager, sales-engineer,
  revenue-operations, financial-analyst, campaign-analytics)
- Update skills-index.json (42 -> 47 skills, 7 categories)
- Fix workflow to skip auto-commit on main (branch protection blocks direct
  pushes). Auto-commit only runs on dev; main gets a warning if out of sync.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/sync-codex-skills.yml

@@ -53,8 +53,8 @@ jobs:
             echo "has_changes=true" >> $GITHUB_OUTPUT
           fi
 
-      - name: Commit changes
-        if: steps.check_changes.outputs.has_changes == 'true' && github.event.inputs.dry_run != 'true'
+      - name: Commit changes (dev only)
+        if: steps.check_changes.outputs.has_changes == 'true' && github.event.inputs.dry_run != 'true' && github.ref != 'refs/heads/main'
         uses: stefanzweifel/git-auto-commit-action@v5
         with:
           commit_message: "chore: sync codex skills symlinks [automated]"
@@ -62,6 +62,11 @@ jobs:
           commit_user_name: "github-actions[bot]"
           commit_user_email: "github-actions[bot]@users.noreply.github.com"
 
+      - name: Warn if main has drift
+        if: steps.check_changes.outputs.has_changes == 'true' && github.ref == 'refs/heads/main'
+        run: |
+          echo "::warning::Codex skills symlinks are out of sync on main. Run the sync on dev and merge via PR."
+
       - name: Summary
         run: |
           echo "## Codex Skills Sync Summary" >> $GITHUB_STEP_SUMMARY