Route command conversion through app core

docs/modernization/roadmap.md

@@ -1,7 +1,7 @@
 # PanoPainter Modernization Roadmap
 
 Status: live
-Last updated: 2026-06-04
+Last updated: 2026-06-05
 
 This is the living roadmap for modernizing PanoPainter into independently
 testable C++23 components while retaining all existing functionality. Keep this
@@ -209,6 +209,11 @@ recording stop, texture/shader invalidation, layout unload, render-target
 destruction, panel-node release, and quick-mode cleanup now lives in
 `pp_app_core`; `App::terminate` and `pano_cli plan-app-shutdown` consume that
 plan while retained cleanup execution stays in the legacy app.
+Command-line panorama conversion planning for renderer-state setup, temporary
+canvas allocation, project open, and equirectangular export now lives in
+`pp_app_core`; `App::cmd_convert` and `pano_cli plan-command-convert` consume
+that sequence while retained OpenGL state dispatch and legacy `Canvas`
+open/export execution 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,
@@ -1667,6 +1672,13 @@ Results:
 - Focused shutdown CTest coverage passed for `pp_app_core_app_shutdown_tests`,
   `pano_cli_plan_app_shutdown_smoke`, and
   `pano_cli_plan_app_shutdown_rejects_unknown_option`.
+- `PanoPainter`, `pp_app_core_command_convert_tests`, and `pano_cli` built
+  after command-line panorama conversion planning moved into `pp_app_core`.
+- Focused command-convert CTest coverage passed for
+  `pp_app_core_command_convert_tests`,
+  `pano_cli_plan_command_convert_smoke`,
+  `pano_cli_plan_command_convert_rejects_empty_project`, and
+  `pano_cli_plan_command_convert_rejects_bad_resolution`.
 - `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.