ENG-8946: Add CLAUDE.md

CLAUDE.md

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+# CLAUDE.md
+
+## What is this project?
+
+The official Reflex website (reflex.dev) — built with Reflex itself. Includes docs, blog, pricing, landing pages, and customer showcases. Serves as both the public-facing site and a real-world example of a production Reflex app.
+
+## Tech stack
+
+- **Framework:** Reflex (Python full-stack)
+- **Styling:** Tailwind CSS v4 with Radix UI color system
+- **Package manager:** UV (`uv sync` to install deps)
+- **Linting:** Ruff, Codespell — enforced via pre-commit
+
+## Project layout
+
+```
+pcweb/              # Main application code
+  pcweb.py          # App entry point
+  whitelist.py      # Dev mode: limits which pages are compiled (faster builds)
+  pages/            # All page routes (docs/, blog/, landing/, pricing/, etc.)
+  components/       # Reusable UI components
+  views/            # Shared view components (navbar, footer, cta)
+  templates/        # Page templates (docpage, mainpage)
+  meta/             # SEO meta tags
+docs/               # Markdown documentation (flexdown)
+blog/               # Blog posts (markdown + frontmatter)
+tests/              # Pytest + Playwright tests
+```
+
+## Commands
+
+| Task | Command |
+|------|---------|
+| Install deps | `uv sync` |
+| Run dev server | `uv run reflex run` |
+| Run prod | `uv run reflex run --env prod` |
+| Compile check | `uv run reflex compile` |
+| Run tests | `uv run pytest tests/` |
+| Install Playwright (if tests fail) | `uv run playwright install` |
+| Lint / format | `uv run pre-commit run --all-files` |
+
+## Dev mode: page whitelist
+
+`pcweb/whitelist.py` limits which pages are compiled in dev mode for faster builds. Empty list = build all. See `pcweb/whitelist.py` for format; paths start with `/`, no trailing slash.
+
+## Code patterns
+
+- **Components:** shared components for the app — see `pcweb/components/`
+- **Pages:** use `@mainpage` or `@docpage` decorators — see `pcweb/pages/`, `pcweb/templates/`
+- **Imports:** absolute from project root — `from pcweb.components.button import button`
+- **Elements:** use `rx.el.*` with Tailwind (not `rx.box`, `rx.text`)
+
+## Key conventions
+
+- Docs: flexdown in `docs/`
+- Blog: flexdown in `blog/`
+- Before committing: `uv run reflex compile` and `uv run pre-commit run --all-files`