Update CLAUDE.md with session learnings and project architecture

- Mark version 0.0.1 tasks as completed
- Add version 0.0.2 roadmap items
- Document project directory structure
- Document database tables and REST API endpoints
- Document key classes and their responsibilities
- Fix version location reference (wc-licensed-product.php, not wp-artists.php)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -36,11 +36,23 @@ This project is proudly **"vibe-coded"** using Claude.AI - the entire codebase w
 
 **Note for AI Assistants:** Clean this section after the specific features are done or new releases are made. Effective changes are tracked in `CHANGELOG.md`
 
-### Version 0.0.1
+### Version 0.0.2 (Next)
 
-- Create the basic structure for a Wordpress/WooCommerce plugin, define `woocommerce` as required dependency
-- Find a reasonable solution to implement a rather safe license management using a client-server-model, bound to single domains. The license server hooks into the existing Wordpress REST API
-- Start to implement an initial version with the features defined and figured out so far
+- Add product version management UI in admin
+- Implement download URL handling for licensed products
+- Add email notification with license key after order completion
+- Consider rate limiting for REST API endpoints
+
+### Version 0.0.1 (Completed)
+
+- ✅ Created basic WordPress/WooCommerce plugin structure
+- ✅ Implemented domain-bound license management via REST API
+- ✅ Added "Licensed Product" WooCommerce product type
+- ✅ License generation on order completion (XXXX-XXXX-XXXX-XXXX format)
+- ✅ Customer account page for viewing licenses
+- ✅ Admin CRUD interface for license management
+- ✅ Checkout domain field for licensed products
+- ✅ German (de_CH) translation
 
 ## Technical Stack
 
@@ -115,8 +127,8 @@ for po in languages/*.po; do msgfmt -o "${po%.po}.mo" "$po"; done
 - Track release changes in a single `CHANGELOG.md` file
 - Bump the version number to either bugfix release versions or on new features minor release versions
 - **CRITICAL**: WordPress reads version from TWO places - BOTH must be updated:
-  1. Plugin header comment `Version: x.x.x` (line ~6 in wp-artists.php) - WordPress uses THIS for admin display
-  2. PHP constant `WC_LICENSED_PRODUCT_VERSION` (line ~25) - Used internally by the plugin
+  1. Plugin header comment `Version: x.x.x` (line ~6 in wc-licensed-product.php) - WordPress uses THIS for admin display
+  2. PHP constant `WC_LICENSED_PRODUCT_VERSION` (line ~28) - Used internally by the plugin
   - If only the constant is updated, WordPress will show the old version in Plugins list
 
 **Important Git Notes:**
@@ -190,3 +202,53 @@ When editing CLAUDE.md or other markdown files, follow these rules to avoid lint
 7. **MD034 - Bare URLs**: Wrap URLs in angle brackets (e.g., `<https://example.com>`) or use markdown link syntax `[text](url)`.
 
 8. **Author section formatting**: Use a heading (`### Name`) instead of bold (`**Name**`) for the author name to maintain consistent document structure.
+
+## Project Architecture
+
+### Directory Structure
+
+```txt
+wc-licensed-product/
+├── assets/
+│   └── css/           # Frontend and admin stylesheets
+├── languages/         # Translation files (.pot, .po, .mo)
+├── releases/          # Release packages (version 0.1.0+)
+├── src/
+│   ├── Admin/         # AdminController - license management UI
+│   ├── Api/           # RestApiController - license validation endpoints
+│   ├── Checkout/      # CheckoutController - domain field at checkout
+│   ├── Frontend/      # AccountController - customer licenses page
+│   ├── License/       # License model and LicenseManager
+│   └── Product/       # LicensedProduct type and LicensedProductType
+├── templates/
+│   ├── admin/         # Twig templates for admin views
+│   └── frontend/      # Twig templates for customer views
+└── vendor/            # Composer dependencies (Twig)
+```
+
+### Database Tables
+
+Created on plugin activation via `Installer::createTables()`:
+
+- `{prefix}_wc_licensed_product_licenses` - License keys with domain binding
+- `{prefix}_wc_licensed_product_versions` - Product version tracking
+
+### REST API Endpoints
+
+Base: `/wp-json/wc-licensed-product/v1/`
+
+| Endpoint       | Method | Description                      |
+| -------------- | ------ | -------------------------------- |
+| `/validate`    | POST   | Validate license key for domain  |
+| `/status`      | POST   | Get license status               |
+| `/activate`    | POST   | Activate license on domain       |
+| `/deactivate`  | POST   | Deactivate license               |
+
+### Key Classes
+
+- `Plugin` (singleton) - Main controller, initializes all components
+- `Installer` - Database setup, activation/deactivation hooks
+- `LicenseManager` - License CRUD, validation, key generation
+- `License` - Entity model with status constants
+- `LicensedProduct` - Extends WC_Product for licensed products
+- `LicensedProductType` - Registers product type with WooCommerce