Plan document share decisions in app core

docs/modernization/build-inventory.md

@@ -422,6 +422,10 @@ Known local toolchain state:
   stop, clear, platform cleanup, frame-count reset, and export progress-total
   planning as JSON; the live recording controls consume those contracts before
   reaching legacy recording threads, PBO readback, and MP4 encoder execution.
+- `pano_cli plan-share-file` exposes `pp_app_core` share availability planning
+  as JSON for unsaved and saved document paths; the live platform share command
+  consumes the same contract before reaching iOS/macOS sharing bridges or
+  retained no-op platform branches.
 - `pano_cli plan-cloud-upload` exposes `pp_app_core` cloud upload availability,
   new-document warning, publish prompt, and save-before-upload planning as JSON;
   the live cloud upload command consumes the same start contract before
@@ -450,6 +454,8 @@ Known local toolchain state:
 - `pp_app_core_document_recording_tests` covers recording start/stop, clear,
   platform recorded-file cleanup, frame-count reset, export progress totals,
   and oversized progress-total clamping.
+- `pp_app_core_document_sharing_tests` covers saved-path gating before platform
+  share execution.
 - `pp_app_core_document_cloud_tests` covers cloud upload no-canvas,
   new-document warning, clean publish prompt, and dirty save-before-upload
   decisions, plus cloud browse no-canvas/show-browser and selected-download