Plan export start decisions in app core

docs/modernization/build-inventory.md

@@ -413,6 +413,11 @@ Known local toolchain state:
   for image file exports, layer/frame collection directories, picked-directory
   stems, and MP4 suggested names as JSON and is covered for file, collection,
   and suggested-name states.
+- `pano_cli plan-export-start` exposes `pp_app_core` export availability
+  planning for license-gated, demo-blocked, and missing-canvas states as JSON;
+  the live image, layer, animation-frame, depth, and cube-face export dialogs
+  consume the same start contract before reaching legacy canvas export
+  execution.
 - `pano_cli simulate-app-session` exposes `pp_app_core` project-open,
   app-close, save, save-as, save-version, and save-before-workflow decisions
   as JSON and is covered for clean, dirty, already-prompting, missing-canvas,
@@ -423,7 +428,8 @@ Known local toolchain state:
   legacy canvas work.
 - `pp_app_core_document_export_tests` covers export file targets, collection
   directory/stem targets, picked-directory stems, MP4 suggested names, and
-  invalid export naming inputs.
+  invalid export naming inputs, plus export-start license/canvas availability
+  decisions.
 - `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,