Add LLM site files (#381)

* feat(docs): add LLM site files

* chore(docs): publish LLM site files

* docs: document site file generation

Author: djalmaaraujo

docs/CLAUDE.md

@@ -0,0 +1,21 @@
+# CLAUDE.md
+
+Guidance for AI agents working inside the `docs/` Rails app.
+
+## LLM and Sitemap Files
+
+The docs app publishes these root files from `public/`:
+
+- `/llms.txt`
+- `/llms-full.txt`
+- `/sitemap.xml`
+
+Their source of truth is `app/lib/site_files.rb`.
+
+Whenever you add, remove, or rename a public route, controller action, or view, check whether it creates or changes a public URL. If it does, update `SiteFiles` and run:
+
+```bash
+bin/rails site_files:generate
+```
+
+Before finishing, review the diff for `public/llms.txt`, `public/llms-full.txt`, and `public/sitemap.xml`. These generated files should be committed with the route/controller/view change so deployed apps expose the updated root files without a manual step.

docs/README.md

@@ -25,4 +25,21 @@ gem "ruby_ui", path: "../ruby_ui"
 
 This workflow allows you to iterate quickly on components while maintaining the gem's structure.
 
-Would you like me to expand on any part of the contributing guide?
+## Site Files
+
+The docs app serves `/llms.txt`, `/llms-full.txt`, and `/sitemap.xml` from `public/`.
+Those files are generated from `app/lib/site_files.rb`, which is the source of truth for the LLM link map and sitemap URL list.
+
+After changing public routes, controllers, or views, update `SiteFiles` if the change adds, removes, or renames a public URL. Then refresh the generated files:
+
+```bash
+bin/rails site_files:generate
+```
+
+Review the resulting diff in:
+
+- `public/llms.txt`
+- `public/llms-full.txt`
+- `public/sitemap.xml`
+
+Set `SITE_FILES_OUTPUT_DIR=tmp/site_files` to generate into a temporary directory instead of overwriting `public/`.

docs/app/controllers/site_files_controller.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class SiteFilesController < ApplicationController
+  def llms
+    render plain: site_files.llms_txt, content_type: "text/plain; charset=utf-8"
+  end
+
+  def llms_full
+    render plain: site_files.llms_full_txt, content_type: "text/plain; charset=utf-8"
+  end
+
+  def sitemap
+    render plain: site_files.sitemap_xml, content_type: "application/xml; charset=utf-8"
+  end
+
+  private
+
+  def site_files
+    @site_files ||= SiteFiles.new
+  end
+end