Centralize legacy brush package import

docs/modernization/build-inventory.md

@@ -617,8 +617,17 @@ Known local toolchain state:
 - `src/legacy_document_open_services.*` is the current app-shell bridge between
   `pp_app_core` document-open plans and live ABR/PPBR import prompts,
   unsaved-project discard prompts, project opening, layer UI refresh, title
-  updates, and action-history clearing; remaining legacy execution ownership is
-  tracked by `DEBT-0039`.
+  updates, and action-history clearing. Accepted brush import prompts now
+  delegate import execution to `src/legacy_brush_package_import_services.*`;
+  remaining legacy document-open ownership is tracked by `DEBT-0039`.
+- `src/legacy_brush_package_import_services.*` is the current app-shell bridge
+  between `pp_app_core` ABR/PPBR brush package import requests and live
+  `NodePanelBrushPreset::import_abr`/`import_ppbr` execution. It preserves the
+  detached legacy import worker threads and preset-panel storage ownership while
+  brush asset/paint/UI ownership is tracked by `DEBT-0048`.
+- `pp_app_core_brush_package_import_tests` covers ABR and PPBR import kind
+  naming, path validation, service dispatch, and empty-path rejection without
+  requiring a window, brush preset panel, or filesystem read.
 - `src/legacy_document_session_services.*` is the current app-shell bridge
   between `pp_app_core` document-session decisions and live close prompts,
   save dialogs, save-version routing, existing-project saves, and