Centralize legacy document session bridge

docs/modernization/build-inventory.md

@@ -584,14 +584,21 @@ Known local toolchain state:
   progress-total decisions.
 - `pp_app_core_document_session_tests` covers clean and dirty app session,
   document-open action planning and executor dispatch/rejection, save-request,
-  save-before-workflow, new-document target/resolution/overwrite planning,
-  document file target, combined save-file overwrite planning, and save-version
-  target decisions without requiring a window, canvas, or message box.
+  close-request executor dispatch/no-op preservation, document-save executor
+  dispatch/no-op preservation, save-before-workflow executor dispatch,
+  new-document target/resolution/overwrite planning, document file target,
+  combined save-file overwrite planning, and save-version target decisions
+  without requiring a window, canvas, or message box.
 - `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`.
+- `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
+  save-before-workflow prompts; retained legacy UI/canvas execution remains
+  tracked by `DEBT-0040`.
 - `src/legacy_history_services.*` is the current app-shell bridge between
   `pp_app_core` history plans and legacy `ActionManager`; toolbar and
   `NodeCanvas` hotkeys share it while document-history extraction remains