Update CLAUDE.md with v0.6.0 session history

- Document WordPress auto-update system implementation
- Add /update-check endpoint to REST API table
- Add Update/ directory to project structure
- Add Email/ directory to project structure
- Update temporary roadmap to v0.7.0

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

CLAUDE.md

@@ -32,7 +32,7 @@ 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`. Do not add completed versions here - document them in the Session History section at the end of this file.
 
-### Version 0.6.0
+### Version 0.7.0
 
 *No planned features yet.*
 
@@ -197,11 +197,13 @@ wc-licensed-product/
 ├── releases/          # Release packages (version 0.1.0+)
 ├── src/
 │   ├── Admin/         # AdminController - license management UI
-│   ├── Api/           # RestApiController - license validation endpoints
+│   ├── Api/           # RestApiController, UpdateController - REST API endpoints
 │   ├── Checkout/      # CheckoutController - domain field at checkout
+│   ├── Email/         # WooCommerce email classes
 │   ├── Frontend/      # AccountController - customer licenses page
 │   ├── License/       # License model and LicenseManager
-│   └── Product/       # LicensedProduct type and LicensedProductType
+│   ├── Product/       # LicensedProduct type and LicensedProductType
+│   └── Update/        # PluginUpdateChecker - WordPress auto-update integration
 ├── templates/
 │   ├── admin/         # Twig templates for admin views
 │   └── frontend/      # Twig templates for customer views
@@ -220,10 +222,11 @@ Created on plugin activation via `Installer::createTables()`:
 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         |
+| `/update-check` | POST   | Check for plugin updates (v0.6.0+) |
 
 Full API documentation available in `openapi.json` (OpenAPI 3.1 specification).
 
@@ -1656,3 +1659,76 @@ Fixed tab rendering bug in WooCommerce product edit page when switching to licen
 - Created release package: `releases/wc-licensed-product-0.5.15.zip` (862 KB)
 - SHA256: `47407de49bae4c649644af64e87b44b32fb30eeb2d50890ff8c4bbb741059278`
 - Committed to `dev` branch
+
+### 2026-01-27 - Version 0.6.0 - WordPress Auto-Update System
+
+**Overview:**
+
+Major feature release implementing WordPress-style automatic updates. Licensed plugins can now receive updates through WordPress's native plugin update mechanism by checking against the license server.
+
+**New files:**
+
+- `src/Api/UpdateController.php` - Server-side REST API endpoint for update checks
+- `src/Update/PluginUpdateChecker.php` - Client-side singleton for WordPress update integration
+
+**Implemented:**
+
+- Server-side `/update-check` REST API endpoint serving WordPress-compatible update information
+- Client-side `PluginUpdateChecker` singleton hooking into WordPress's native update system
+- Hooks: `pre_set_site_transient_update_plugins`, `plugins_api`, `http_request_args`
+- New "Auto-Updates" settings subtab with enable/disable toggle and check frequency
+- Configurable cache TTL for update checks (1-168 hours, default: 12)
+- Secure download authentication via `X-License-Key` header
+- Response signing support for tamper-proof update responses
+
+**Modified files:**
+
+- `src/Plugin.php` - Added UpdateController and PluginUpdateChecker initialization
+- `src/Admin/SettingsController.php` - Added 'auto-updates' section with settings
+- `openapi.json` - Documented `/update-check` endpoint with request/response schemas
+- `languages/*` - Updated translations for new strings
+
+**Settings Controller Changes:**
+
+- Added `'auto-updates'` to `getSections()` for sub-tab navigation
+- New `getAutoUpdatesSettings()` method returning enable/frequency settings
+- New static methods: `isAutoUpdateEnabled()`, `getUpdateCheckFrequency()`
+
+**UpdateController API:**
+
+- Endpoint: `POST /wp-json/wc-licensed-product/v1/update-check`
+- Request: `license_key`, `domain`, `plugin_slug` (optional), `current_version` (optional)
+- Response: `update_available`, `version`, `download_url`, `package`, `changelog`, `tested`, `requires`, `requires_php`, etc.
+- License validation before serving update info
+- Secure download URL generation using existing DownloadController patterns
+
+**PluginUpdateChecker Features:**
+
+- Singleton pattern with `getInstance()`
+- Caching via WordPress transients (`wclp_update_info`)
+- Automatic cache clearing on settings save
+- Only activates when license server URL is configured and not self-licensing
+- `forceUpdateCheck()` method for manual refresh
+
+**Configuration:**
+
+To disable auto-updates programmatically:
+
+```php
+define('WC_LICENSE_DISABLE_AUTO_UPDATE', true);
+```
+
+**Technical notes:**
+
+- Update checker only registers when `SettingsController::getPluginLicenseServerUrl()` returns a value
+- Self-licensing detection prevents circular update checks (via `PluginLicenseChecker::isSelfLicensing()`)
+- Download URLs include license key in `X-License-Key` header for server-side verification
+- Uses Symfony HttpClient for server requests with 15s timeout
+- Cache TTL configurable from 1-168 hours in settings
+- OpenAPI spec updated to version 0.6.0 with full `/update-check` documentation
+
+**Release v0.6.0:**
+
+- Created release package: `releases/wc-licensed-product-0.6.0.zip` (1.1 MB)
+- SHA256: `171c8195c586b3b20bac4a806e2d698cdaaf15966e2fd6e1670ec39dac8ab027`
+- Tagged as `v0.6.0` and pushed to `main` branch