Update agent guidelines (#338)

Author: deleonio

AGENTS.md

@@ -0,0 +1,42 @@
+# Coding agent guidelines for public-ui.github.io
+
+This repository contains the Docusaurus documentation for the KoliBri component library.
+
+## Development setup
+
+- Use **pnpm** as the package manager. Run `pnpm install` if dependencies are missing.
+- Check TypeScript and ESLint rules with `pnpm run lint`.
+- Ensure the site can be built locally with `pnpm run build`.
+
+## Commit messages
+
+Commits must follow the [Conventional Commits](https://www.conventionalcommits.org) style. A commitlint configuration is present in `commitlint.config.js`.
+
+## Documentation and translation rules
+
+Follow these rules when editing or adding docs:
+
+- File names must be in **English** to generate SEO-friendly URLs.
+- Keep translations close to the original text.
+- Translation keys are written in English using **kebab-case**.
+- The default translation text (`message`) is written in **German**.
+- Use the `translate` method rather than the `Translate` component.
+- Do not add custom translation descriptions.
+- Avoid explicit `slug` definitions (except in `docs/welcome.md`); slugs are generated from file names.
+- All code samples and technical terms are in English.
+- Remove tag sections: replace `/tags:(\n.+)+/` with `---`.
+
+## Formatting conventions
+
+- Tabs are used for indentation except in Markdown files (see `.editorconfig`).
+- Prettier is configured for a line width of 120 characters and single quotes.
+
+## Required checks before committing
+
+Run the following commands and ensure they succeed:
+
+```bash
+pnpm run lint
+pnpm run build
+```
+