Add WooCommerce HPOS compatibility and fix pricing conflicts (v1.1.3)

Fixes WooCommerce compatibility warnings reported by user.

WooCommerce HPOS compatibility:
- Added before_woocommerce_init hook to declare HPOS compatibility
- Declares compatibility with custom_order_tables feature
- Ensures plugin works with WooCommerce's modern order storage

Price calculation improvements:
- Added static flag to prevent multiple executions
- Added composable_price_calculated flag to cart items
- Prevents conflicts with third-party pricing plugins
- Stops other plugins from re-calculating composable product prices

This resolves incompatibility warnings with:
- WooCommerce Analytics
- WooCommerce Update Manager
- Third-party pricing extensions

Files modified:
- wc-composable-product.php: Version 1.1.3, HPOS declaration
- includes/Cart_Handler.php: Improved price calculation guards
- CHANGELOG.md: Documented changes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

wc-composable-product.php

@@ -3,7 +3,7 @@
  * Plugin Name: WooCommerce Composable Products
  * Plugin URI: https://github.com/magdev/wc-composable-product
  * Description: Create composable products where customers select a limited number of items from a configurable set
- * Version: 1.1.2
+ * Version: 1.1.3
  * Author: Marco Graetsch
  * Author URI: https://example.com
  * License: GPL v3 or later
@@ -19,7 +19,7 @@
 defined('ABSPATH') || exit;
 
 // Define plugin constants
-define('WC_COMPOSABLE_PRODUCT_VERSION', '1.1.2');
+define('WC_COMPOSABLE_PRODUCT_VERSION', '1.1.3');
 define('WC_COMPOSABLE_PRODUCT_FILE', __FILE__);
 define('WC_COMPOSABLE_PRODUCT_PATH', plugin_dir_path(__FILE__));
 define('WC_COMPOSABLE_PRODUCT_URL', plugin_dir_url(__FILE__));
@@ -64,6 +64,15 @@ function wc_composable_product_init() {
 // Use woocommerce_init to ensure all WooCommerce classes including settings are loaded
 add_action('woocommerce_init', 'wc_composable_product_init');
 
+/**
+ * Declare HPOS compatibility
+ */
+add_action('before_woocommerce_init', function() {
+    if (class_exists(\Automattic\WooCommerce\Utilities\FeaturesUtil::class)) {
+        \Automattic\WooCommerce\Utilities\FeaturesUtil::declare_compatibility('custom_order_tables', __FILE__, true);
+    }
+});
+
 /**
  * Activation hook
  */