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-feat(wc-catalog-expansion): Stage 9C — WooCommerce catalog expansion
-
-- Add ProductCategory domain model (id, name, slug, parentId, count) with copyWith, equality, toString
-- Add ProductImage domain model (id, url, alt, position) with copyWith, equality
-- Extend ProductPublishingRepository contract: createProduct, deleteProduct, updateProductImages, getProductImages, getCategories, createCategory, updateCategory, deleteCategory
-- Implement all 8 new methods in FakeProductPublishingRepository with seed categories
-- Implement all 8 new methods in WordPressProductPublishingRepository
-- Add WooCommerceApiClient methods: createProduct, deleteProduct, getCategories (paginated), createCategory, updateCategory, deleteCategory, getProductImages, setProductImages
-- Add use cases: CreateProduct, DeleteProduct, GetCategories, CreateCategory, UpdateProductImages
-- Update feature_wordpress.dart barrel exports
-- Update test stubs in dashboard_controller_test.dart and product_publishing_page_test.dart
-- Add 69 new tests in wc_catalog_expansion_test.dart (388 total feature_wordpress, 24 kell_web — all passing)
-- Update master_development_brief.md and build_execution_tracker.md