[Documentation] Add root CLAUDE.md for monorepo (#375)

Author: djalmaaraujo

CLAUDE.md

@@ -0,0 +1,62 @@
+# CLAUDE.md
+
+Guidance for AI agents working at the root of the `ruby-ui/ruby_ui` monorepo.
+
+## Layout
+
+Two sibling projects, each independent (own `Gemfile`, `package.json`, tests, lockfiles):
+
+| Path | What it is |
+| --- | --- |
+| [`gem/`](gem/) | The `ruby_ui` gem — Phlex components, generators, gemspec, Minitest suite. Published to RubyGems from here. |
+| [`docs/`](docs/) | Rails 8 app powering https://rubyui.com. Consumes the local gem via `path: "../gem"`. |
+| `.github/workflows/ci.yml` | Unified CI: gem tests (Ruby 3.3 + 3.4), docs Rails tests, docker build for docs devcontainer. |
+
+Subproject-specific instructions live in `gem/AGENTS.md` and `docs/CLAUDE.md` (→ `docs/AGENTS.md`). Read those before editing inside a subdir.
+
+## Routing changes
+
+- Component code → `gem/lib/ruby_ui/<component>/`. Tests → `gem/test/ruby_ui/<component>_test.rb`.
+- Component docs view → `docs/app/views/docs/<component>.rb`. Update in same PR as the component.
+- Generator/installer logic → `gem/lib/generators/ruby_ui/`. Dependency map → `gem/lib/generators/ruby_ui/dependencies.yml`.
+- Site chrome, routes, marketing pages → `docs/app/`.
+
+## Common commands
+
+Run from the relevant subdir, not root.
+
+```bash
+# Gem
+cd gem
+bundle exec rake                                  # tests + standardrb
+bundle exec rake test TEST=test/ruby_ui/button_test.rb
+bundle exec standardrb --fix
+
+# Docs site
+cd docs
+bin/setup
+bin/dev                                           # local server
+pnpm build && pnpm build:css                      # assets
+bin/rails db:test:prepare test
+bundle exec standardrb
+```
+
+## Conventions
+
+- Ruby 3.2+, 2-space indent, `snake_case` files/methods, `CamelCase` classes. StandardRB enforced.
+- Components extend `RubyUI::Base < Phlex::HTML`; classes merged via `tailwind_merge`. Invoke as `RubyUI.<Name>()` (Phlex::Kit).
+- Stimulus controllers colocated with components: `<component>_controller.js`. JS deps declared in `gem/package.json` and per-component in `dependencies.yml`.
+- Tests extend `ComponentTest`; render via `phlex { ... }` helper.
+
+## Commits & PRs
+
+- Bracketed prefixes (`[Feature]`, `[Bug Fix]`, `[Documentation]`) or scoped conventional (`feat(scope): ...`).
+- Imperative, focused commits. Reference issues/PRs as `(#123)`.
+- PRs: linked issue, concise description, before/after screenshots for UI changes, explicit test steps.
+
+## Don'ts
+
+- Don't run commands from repo root expecting them to work — `cd gem` or `cd docs` first.
+- Don't edit a component without updating its `docs/app/views/docs/<component>.rb` counterpart.
+- Don't bump the gem version or release from `docs/`; releases happen in `gem/`.
+- Don't commit secrets; each app uses local env config.