Agent Skills: typo3-docs

Create and maintain TYPO3 extension documentation following official docs.typo3.org standards. Use when creating/editing Documentation/*.rst files or README.md, using TYPO3 directives (confval, versionadded, card-grid, accordion, tabs, admonitions), creating/adding screenshots, rendering/testing/viewing docs locally, or deploying to docs.typo3.org. By Netresearch.