feat(wordpress): add category-only product edit (Stage 1B)

docs/development/build_execution_tracker.md

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+# Build Execution Tracker
+
+## Current status
+
+- main baseline updated through: description-only-edit
+- current branch: feat/category-only-edit (implementation complete, pending merge)
+- next branch: feat/post-write-consistency
+- current stage: Stage 1 — Web application completion (Stage 1B complete)
+
+## Slice tracker
+
+### feat/description-only-edit
+
+- status: merged to main
+- inspection: complete
+- implementation: complete
+- tests: passed (212/212)
+- analyze: passed
+- brief updated: yes
+
+### feat/category-only-edit
+
+- status: implementation complete, pending merge to main
+- inspection: complete
+- implementation: complete
+- tests: passed (223/223 feature_wordpress, 5/5 kell_web dashboard)
+- analyze: passed (dart analyze — no issues found)
+- brief updated: yes
+- changed files:
+  - `lib/src/domain/product_publishing_repository.dart` — added `updateProductCategory` contract
+  - `lib/src/application/update_product_category.dart` — new use case (created)
+  - `lib/src/application/product_publishing_controller.dart` — added `CategoryActionResult`, `updateCategory`, `lastCategoryResult`, `consumeCategoryResult`
+  - `lib/src/data/fake_product_publishing_repository.dart` — implemented `updateProductCategory`
+  - `lib/src/data/wordpress_product_publishing_repository.dart` — implemented `updateProductCategory` (WP API mapping)
+  - `lib/src/presentation/widgets/product_preview_panel.dart` — added inline category edit UI (`onCategoryChanged`, `_buildCategoryRow`)
+  - `lib/src/presentation/product_publishing_page.dart` — wired `UpdateProductCategory` use case and `onCategoryChanged` callback
+  - `lib/src/presentation/widgets/status_action_snack_bar.dart` — added `showCategoryActionSnackBar`
+  - `lib/feature_wordpress.dart` — barrel export for `update_product_category.dart`
+  - `test/product_publishing_controller_test.dart` — added `updateCategory` test group (5 tests)
+  - `test/fake_product_publishing_repository_test.dart` — added `updateProductCategory` test group (6 tests)
+  - `test/widgets/product_publishing_page_test.dart` — updated mock to include `updateProductCategory`
+  - `apps/kell_web/test/dashboard/application/dashboard_controller_test.dart` — updated mock to include `updateProductCategory`
+  - `docs/development/master_development_brief.md` — updated baseline, validation state, next branch
+  - `docs/development/build_execution_tracker.md` — this file
+
+### feat/post-write-consistency
+
+- status: queued (Stage 2A)
+- inspection: pending
+- implementation: pending
+- tests: pending
+- analyze: pending
+- brief updated: no