Eleventy v3, Build Awesome v4 prerelease, and Nunjucks operating guide for static-site authoring, templates, build pipelines, migrations, and security review. Use when the user asks to "create an 11ty page", "add a Nunjucks filter", "fix my layout chain", "review my .njk template", "set up Eleventy", "migrate to Build Awesome", or "audit my static site"; when `package.json` includes `@11ty/eleventy` or `@awesome.me/buildawesome`; when paths include `.eleventy.js`, `eleventy.config.js`, `.njk`, `.11tydata.js`, `.data.js`, `.11ty.js`, or `.server.js`; or when debugging data cascades, filters, shortcodes, async Nunjucks, autoescape, or static-site security.