Route app input dispatch through app core

docs/modernization/debt.md

@@ -98,6 +98,13 @@ agent or engineer to remove them without reconstructing context from chat.
   `App::create`, `App::tick`, `App::resize`, `App::update`, `App::draw`, and
   `pano_cli plan-app-frame`; retained layout traversal, toolbar widget writes,
   render-target recreation, and OpenGL/UI drawing remain in the legacy app.
+- 2026-06-05: DEBT-0003 was narrowed. Pointer coordinate normalization,
+  mouse designer-first routing, gesture midpoint/delta math, touch/key
+  main-layout routing, and VR spacebar camera-sync intent are now tested
+  `pp_app_core` input plans consumed by `App::mouse_*`, `App::gesture_*`,
+  `App::touch_tap`, `App::key_*`, and `pano_cli plan-app-input`; retained
+  `MouseEvent`/`GestureEvent`/`TouchEvent`/`KeyEvent` construction and legacy
+  `Node` event dispatch remain in the app shell.
 - 2026-06-05: DEBT-0003 was narrowed again. Shutdown cleanup staging for
   UI-state save, stroke-preview renderer shutdown, recording stop,
   texture/shader invalidation, layout unload, UI render-target and face-plane