Route VR mode through app preferences

docs/modernization/build-inventory.md

@@ -169,10 +169,10 @@ Known local toolchain state:
   `DEBT-0035`.
 - `src/legacy_app_preference_services.*` is the current app-shell bridge for
   options-menu preference execution. It keeps UI scale, viewport scale, RTL,
-  VR-controller, auto-timelapse, and canvas cursor-mode callbacks on the
-  `pp_app_core` `AppPreferenceServices` contract while retained settings
-  persistence, recording lifecycle, and legacy canvas/UI execution remain
-  tracked by `DEBT-0045`.
+  VR mode, VR-controller, auto-timelapse, and canvas cursor-mode callbacks on
+  the `pp_app_core` `AppPreferenceServices` contract while retained settings
+  persistence, VR start/stop, recording lifecycle, and legacy canvas/UI
+  execution remain tracked by `DEBT-0045`.
 - `src/legacy_canvas_tool_services.*` is the current app-shell bridge for
   canvas toolbar tool selection, NodeCanvas stylus/input mode switching, and
   canvas hotkey/touch execution. It keeps those live paths on the `pp_app_core`
@@ -584,8 +584,9 @@ Known local toolchain state:
   planning before platform clipboard callbacks.
 - `pp_app_core_app_preferences_tests` covers UI scale/font-scale planning,
   scale-option selection, viewport scale planning, RTL direction planning,
-  timelapse start/stop/no-op decisions, simple stored preferences, and
-  `AppPreferenceServices` execution dispatch for options-menu side effects.
+  timelapse start/stop/no-op decisions, VR mode success/failure dispatch,
+  simple stored preferences, and `AppPreferenceServices` execution dispatch for
+  options-menu side effects.
 - `pp_platform_api_tests` covers service dispatch for clipboard read/write,
   empty clipboard writes, cursor visibility, virtual-keyboard visibility,
   external file display, file sharing, and picker callbacks without platform