Plan save-as file writes in app core

docs/modernization/build-inventory.md

@@ -403,7 +403,8 @@ Known local toolchain state:
   states.
 - `pano_cli plan-document-file` exposes `pp_app_core` document-name
   validation, legacy `.ppi` path construction, and overwrite-prompt decisions
-  as JSON and is covered for save-now and existing-target overwrite states.
+  as JSON through the same combined save-file plan consumed by the live save-as
+  dialog; it is covered for save-now and existing-target overwrite states.
 - `pano_cli plan-document-version` exposes `pp_app_core` save-version suffix
   parsing, candidate path generation, collision skipping, and no-slot failure
   behavior as JSON and is covered for first-version and existing-path skip
@@ -426,8 +427,8 @@ Known local toolchain state:
 - `pp_app_core_document_session_tests` covers clean and dirty app session,
   document-open action planning, save-request, save-before-workflow,
   new-document target/resolution/overwrite planning, document file target,
-  overwrite, and save-version target decisions without requiring a window,
-  canvas, or message box.
+  combined save-file overwrite planning, and save-version target decisions
+  without requiring a window, canvas, or message box.
 - `pp_ui_core` consumes vcpkg tinyxml2 only when `PP_USE_VCPKG_TINYXML2=ON`
   through the vcpkg preset; default and Android validation still use the
   retained vendored fallback tracked by DEBT-0012.