Plan save-version targets in app core

docs/modernization/build-inventory.md

@@ -397,6 +397,10 @@ Known local toolchain state:
 - `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.
+- `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
+  states.
 - `pano_cli plan-export-target` exposes `pp_app_core` export target planning
   for image file exports, layer/frame collection directories, picked-directory
   stems, and MP4 suggested names as JSON and is covered for file, collection,
@@ -413,8 +417,9 @@ Known local toolchain state:
   directory/stem targets, picked-directory stems, MP4 suggested names, and
   invalid export naming inputs.
 - `pp_app_core_document_session_tests` covers clean and dirty app session,
-  save-request, save-before-workflow, document file target, and overwrite
-  decisions without requiring a window, canvas, or message box.
+  save-request, save-before-workflow, document file target, overwrite, 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.