Plan keyboard visibility in app core

docs/modernization/build-inventory.md

@@ -433,6 +433,10 @@ Known local toolchain state:
 - `pano_cli plan-display-file` exposes `pp_app_core` external file presentation
   planning as JSON for empty and non-empty paths; the live display-file command
   consumes the same contract before retained platform open-file bridges.
+- `pano_cli plan-keyboard-visibility` exposes `pp_app_core` virtual keyboard
+  visibility planning as JSON for hidden and visible states; live show/hide
+  keyboard requests consume the same contract before retained mobile platform
+  keyboard bridges.
 - `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
@@ -465,7 +469,8 @@ Known local toolchain state:
   share execution.
 - `pp_app_core_document_platform_io_tests` covers empty selected-path filtering
   and non-empty picked-path callback planning, plus empty/non-empty display-file
-  planning before platform picker/display callbacks.
+  planning before platform picker/display callbacks, plus virtual keyboard
+  show/hide planning before platform keyboard callbacks.
 - `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