Route app frame decisions through app core

docs/modernization/roadmap.md

@@ -198,6 +198,11 @@ and floating-point render targets; `App::title_update`,
 `App::update_memory_usage`, `App::update_rec_frames`, resolution helpers,
 `App::initLayout`, and `pano_cli plan-app-status` consume those contracts while
 legacy UI nodes still render the strings and status lights.
+Frame-level app decisions for the initial surface size, redraw/animation update
+gating, canvas-stroke drawing, VR UI drawing, main UI drawing, and redraw reset
+now live in `pp_app_core`; `App::create`, `App::update`, `App::draw`, and
+`pano_cli plan-app-frame` consume those plans while retained layout traversal
+and OpenGL/UI drawing stay in the legacy app.
 `panopainter_app` is now a real static target that owns app orchestration
 sources, app version metadata, and version-header generation.
 `pp_panopainter_ui` now owns app-specific modal, dialog, panel, canvas,
@@ -1286,7 +1291,7 @@ standard x64/arm64, Android Quest arm64, Android Focus/Wave arm64,
 Emscripten/WebGL, macOS, iOS device, and iOS simulator. `platform-build`
 automation now builds the current headless component matrix, including
 `pp_platform_api`, `pp_app_core`, platform API tests, brush-package tests, and
-the current app-core startup/file/document/brush/canvas/history/grid/toolbar/
+the current app-core startup/frame/file/document/brush/canvas/history/grid/toolbar/
 tools/about/preferences/status automation tests. The PowerShell wrapper also
 normalizes comma-separated `-Presets` and `-Targets` values for reliable
 machine-driven partial matrix checks. `panopainter_platform_build_target_matrix_self_test`
@@ -1643,6 +1648,11 @@ Results:
   `pano_cli_plan_app_startup_rejects_negative_counter`, with startup resource
   sequencing also covered by `pano_cli_plan_app_startup_resources_smoke` and
   `pano_cli_plan_app_startup_resources_rejects_bad_size`.
+- `PanoPainter`, `pp_app_core_app_frame_tests`, and `pano_cli` built after
+  app frame surface/update/draw-pass decisions moved into `pp_app_core`.
+- Focused frame CTest coverage passed for `pp_app_core_app_frame_tests`,
+  `pano_cli_plan_app_frame_vr_smoke`, and
+  `pano_cli_plan_app_frame_idle_missing_canvas_smoke`.
 - `PanoPainter`, `pp_app_core_brush_package_export_tests`, and `pano_cli` built
   after PPBR brush package export request validation and dispatch moved behind
   app-core brush package services.