feat: add Claude Code review workflow and repo context

Add CLAUDE.md with repo description and tech stack context, and a
GitHub Actions workflow that triggers Claude Code review on every PR
via the shared scality/workflows reusable workflow.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ChengYanJin

.github/workflows/review.yml

@@ -0,0 +1,10 @@
+name: Code Review
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+  review:
+    uses: scality/workflows/.github/workflows/claude-code-review.yml@v2
+    secrets: inherit

CLAUDE.md

@@ -0,0 +1,30 @@
+# core-ui
+
+This is **Scality's shared React component library** (`@scality/core-ui`). It contains:
+
+- Reusable UI components (buttons, modals, tables, charts, forms, navigation) in `src/lib/components/`
+- A design-system theme (`src/lib/style/theme.ts`) built on styled-components and styled-system
+- Custom ESLint plugin (`valalint`) enforcing UI conventions (`src/lib/valalint/`)
+- Storybook documentation for every component (`stories/`)
+- A `next.ts` entry point for newer/experimental components (`src/lib/next.ts`)
+
+## Tech stack
+
+- **Language:** TypeScript (strict mode, `noImplicitAny` off)
+- **UI:** React 18/19, styled-components v5, styled-system, Floating UI
+- **Charts:** Recharts
+- **Forms:** react-hook-form
+- **Tables:** react-table v7
+- **Routing:** react-router v7
+- **Testing:** Jest + Testing Library
+- **Storybook:** v10 with Webpack 5
+- **Build:** TypeScript compiler (`tsc`) — no bundler
+- **Linting:** ESLint + custom valalint plugin
+- **Package:** Published to npm as `@scality/core-ui`
+
+## Commands
+
+- `npm test` — run Jest tests
+- `npm run build` — compile TypeScript to `dist/`
+- `npm run lint` — run ESLint
+- `npm run storybook` — start Storybook dev server on port 3001