Route app thread orchestration through app core

docs/modernization/roadmap.md

@@ -212,6 +212,14 @@ touch-lock attachment now live in `pp_app_core`; `App::mouse_*`,
 `App::set_stylus`, and `pano_cli plan-app-input` consume those plans while
 retained event objects, child-node mutation, and legacy `Node` dispatch stay
 in the app shell.
+App thread orchestration decisions for render/UI task dispatch, unique queued
+task replacement, queue draining, render-context wrapping, async redraw
+notification, UI tick redraw scheduling, UI-loop timer/report/reload cadence,
+and thread start/stop intents now live in `pp_app_core`; `App::render_task*`,
+`App::ui_task*`, `App::async_redraw`, `App::render_thread_*`,
+`App::ui_thread_*`, and `pano_cli plan-app-thread` consume those plans while
+retained `std::thread`, condition-variable, OpenGL context, live reload, and
+task execution remain in the app shell.
 Shutdown lifecycle staging for UI-state save, stroke-preview renderer shutdown,
 recording stop, texture/shader invalidation, layout unload, render-target
 destruction, panel-node release, and quick-mode cleanup now lives in
@@ -1685,6 +1693,14 @@ Results:
   `pano_cli_plan_app_input_stylus_smoke`,
   `pano_cli_plan_app_input_rejects_bad_float`, and
   `pano_cli_plan_app_input_rejects_missing_ui_panel`.
+- `PanoPainter`, `pp_app_core_app_thread_tests`, and `pano_cli` built after
+  render/UI task dispatch, queue draining, UI-loop timer cadence, async redraw,
+  and start/stop decisions moved into `pp_app_core`.
+- Focused app-thread CTest coverage passed for `pp_app_core_app_thread_tests`,
+  `pano_cli_plan_app_thread_dispatch_smoke`,
+  `pano_cli_plan_app_thread_ui_loop_smoke`,
+  `pano_cli_plan_app_thread_stop_smoke`, and
+  `pano_cli_plan_app_thread_rejects_bad_timer`.
 - `PanoPainter`, `pp_app_core_app_shutdown_tests`, and `pano_cli` built after
   shutdown cleanup staging moved into `pp_app_core`.
 - Focused shutdown CTest coverage passed for `pp_app_core_app_shutdown_tests`,