fix(contributors): add skills to custom contributor types

- Improve errors in contributor-report.mjs
- Add missing `skills` to custom contribution types list and docs
- Refresh existing contributors

Assisted-by: GitHub Copilot <copilot@github.com>
Signed-off-by: Ashley Childress <6563688+anchildress1@users.noreply.github.com>

.github/workflows/contributors.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v6
         with:
-          fetch-depth: 0  # Required: add-missing-contributors.js needs full git history
+          fetch-depth: 0
 
       - name: Extract Node version from package.json
         id: node-version