chore: add CLAUDE.md for Claude Code guidance

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+WordPress plugin integrating the Axeptio CMP (Consent Management Platform) SDK for GDPR-compliant cookie consent management. Published on WordPress.org SVN. Supports WPML/PolyLang for multilingual sites.
+
+- **Plugin slug**: `axeptio-wordpress-plugin`
+- **Text domain**: `axeptio-wordpress-plugin`
+- **Min PHP**: 7.4 | **Min WP**: 5.6
+- **Constant prefix**: `XPWP_`
+- **Global prefixes** (PHPCS enforced): `axeptio`, `AXEPTIO`, `Axeptio`, `XPWP`, `xpwp`
+
+## Development Commands
+
+All task commands use [Taskfile](https://taskfile.dev) and run inside Docker.
+
+```bash
+# Docker environment
+task build          # Build and start containers
+task start / stop   # Start/stop containers
+task ssh            # Shell into container
+
+# PHP
+task composer-install   # Install all deps (incl. dev)
+task composer-build     # Install production deps only (--no-dev --optimize-autoloader)
+task lint-php           # PHPCS (WordPress Coding Standards)
+task fix-php            # Auto-fix PHPCS violations
+task php-stan           # PHPStan static analysis (level max)
+
+# Tests (Pest v1 on PHPUnit, runs inside Docker)
+docker-compose run --rm web composer test        # Run all tests
+docker-compose run --rm web vendor/bin/pest      # Run all tests directly
+docker-compose run --rm web vendor/bin/pest tests/GtmEventsTest.php  # Single test file
+
+# JavaScript / CSS (run on host, uses Volta node 18)
+yarn install
+yarn build              # One-time dev build (Laravel Mix + Tailwind)
+yarn build:production   # Production build
+yarn start              # Watch mode with BrowserSync
+yarn eslint assets/js/  # ESLint
+
+# Release to WordPress.org SVN
+task release -- <version>
+```
+
+## Commits
+
+Conventional commits enforced by Husky + commitlint. Allowed types: `build`, `chore`, `ci`, `docs`, `feat`, `fix`, `hotfix`, `perf`, `refactor`, `revert`, `style`, `test`. Prettier runs on staged `.js`, `.md`, `.yml`, `.mjs` files via lint-staged.
+
+## Architecture
+
+### Module System
+
+All features extend the abstract `Module` class (`includes/classes/class-module.php`) which requires `can_register()` and `register()` methods. `Module_Initialization` (singleton) auto-discovers and initializes modules sorted by `$load_order`.
+
+Registered modules (in `class-module-initialization.php`):
+- `Models` — data layer
+- `Activation_Hook` — plugin activation logic
+- `AlpineJS_Wpkses` — wp_kses compatibility for Alpine.js attributes
+- `Admin\Pages\Admin_Main` — admin settings pages
+- `Axeptio_Sdk` — frontend SDK injection
+- `Hook_Modifier` — consent-based script blocking
+- `Plugins` — REST API for plugin management
+- `Wp_Rocket` — WP Rocket cache compatibility
+- `Settings` — backend settings registration
+- `Sdk_Proxy` — SDK proxy endpoint
+
+### Key Directory Layout
+
+```
+axeptio-wordpress-plugin.php   # Entry point, defines constants, bootstraps
+includes/
+  core.php                     # setup(), init(), activate(), deactivate(), asset enqueue
+  helpers/
+    helpers.php                # Plugin helpers (Axeptio\Plugin namespace)
+    utility.php                # Asset utilities (Axeptio\Plugin\Utility namespace)
+  classes/                     # PSR-4 autoloaded under \Axeptio\Plugin\
+    admin/                     # Admin pages, settings UI, REST endpoints
+    backend/                   # Backend settings registration
+    frontend/                  # SDK injection, hook modifier, SDK proxy
+    models/                    # Data models (Client ID, Plugins, Settings, SDK, etc.)
+    migrations/                # Versioned DB migrations (class-migration-X.Y.Z.php)
+    third-party/               # Third-party integrations (WP Rocket)
+    compat/                    # Compatibility layers (Alpine.js wp_kses)
+    utils/                     # Template engine, migration manager, hook parser
+templates/
+  admin/                       # Admin PHP templates
+  frontend/                   # Frontend PHP templates
+assets/
+  js/                          # Source JS (backend/app.js, frontend/axeptio.js)
+  css/                         # Source CSS (backend uses Tailwind, frontend plain PostCSS)
+dist/                          # Built assets (generated, not committed)
+```
+
+### Frontend Stack
+
+- **JS**: Alpine.js with `@alpinejs/persist`
+- **CSS**: Tailwind CSS (admin only, scoped to `#axeptio-app` via `important`), PostCSS with nesting
+- **Build**: Laravel Mix (Webpack), outputs to `dist/`
+
+### Coding Standards
+
+- **PHP**: WordPress Coding Standards (WPCS) via PHPCS. Short array syntax `[]` enforced. PHP 7.4+ features allowed.
+- **JS**: WordPress ESLint plugin
+- **Static analysis**: PHPStan at max level with WordPress extensions