Centralize legacy app startup

docs/modernization/roadmap.md

@@ -183,6 +183,12 @@ contracts. Options-menu preference execution now dispatches through
 `AppPreferenceServices` and `src/legacy_app_preference_services.*` before
 legacy widgets, settings persistence, recording toggles, and canvas cursor
 updates continue.
+It also owns tested startup plans for run-counter increments, preference-save
+intent, auto-timelapse startup, stored VR-controller state, and license-warning
+visibility. `App::init` now plans those decisions before heavy initialization,
+executes run-counter persistence through `src/legacy_app_startup_services.*`
+before asset/layout setup, and executes runtime startup side effects after the
+UI layout and main render target exist.
 It also owns tested app status/display plans for document title text,
 resolution mapping/labels, DPI text, history-memory text, and recording-frame
 status text, plus renderer diagnostic indicator labels for framebuffer fetch
@@ -1358,6 +1364,11 @@ Results:
 - Focused preference CTest coverage passed for
   `pp_app_core_app_preferences_tests` and the app-preferences CLI smoke tests
   after the live bridge split, including VR mode failed-start status coverage.
+- `PanoPainter`, `pp_app_core_app_startup_tests`, and `pano_cli` built after
+  startup preference/runtime execution moved behind app startup services.
+- Focused startup CTest coverage passed for `pp_app_core_app_startup_tests`,
+  `pano_cli_plan_app_startup_smoke`, and
+  `pano_cli_plan_app_startup_rejects_negative_counter`.
 - `pp_app_core_document_recording_tests` passed, covering recording start/stop,
   clear, platform recorded-file cleanup, frame-count reset, export progress
   totals, and oversized progress-total clamping.