Plan document open actions in app core

docs/modernization/build-inventory.md

@@ -394,6 +394,9 @@ Known local toolchain state:
 - `pano_cli classify-open` exposes the `pp_app_core` document-open route
   contract as JSON and is covered for project files, ABR imports, PPBR
   imports, and malformed path rejection.
+- `pano_cli plan-open-route` exposes `pp_app_core` document-open action
+  planning as JSON and is covered for clean project open, dirty project
+  discard-prompt, and ABR import-prompt 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.
@@ -417,9 +420,9 @@ 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, overwrite, and
-  save-version target decisions without requiring a window, canvas, or message
-  box.
+  document-open action planning, 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.