Extract image import route planning

docs/modernization/roadmap.md

@@ -511,6 +511,11 @@ legacy canvas mode execution continues.
 clear-current-layer command, including clear color validation, no-canvas
 handling, undo recording intent, and dirty-state intent before legacy
 `Canvas::clear` execution continues.
+`pano_cli plan-image-import` exposes app-core planning for File > Import image
+route decisions, including wide equirectangular images, legacy vertical cube
+strips, regular transform-placement images, and invalid image dimensions before
+legacy `Canvas::import_equirectangular` or import transform-mode execution
+continues.
 `pano_cli plan-grid-operation` exposes app-core planning for grid heightmap
 pick/load/reload/clear, lightmap render capability/limit checks, and heightmap
 commit used by the live grid panel before legacy image loading, OpenGL texture
@@ -1191,6 +1196,13 @@ Results:
   `pano_cli_plan_canvas_clear_no_canvas_smoke`, and
   `pano_cli_plan_canvas_clear_rejects_bad_color` passed and expose toolbar
   canvas clear planning as JSON automation.
+- `pp_app_core_document_import_tests` passed, covering wide equirectangular,
+  legacy vertical cube strip, regular transform-placement, and invalid-dimension
+  import route decisions.
+- `pano_cli_plan_image_import_wide_equirect_smoke`,
+  `pano_cli_plan_image_import_transform_smoke`, and
+  `pano_cli_plan_image_import_rejects_invalid_dimensions` passed and expose File
+  > Import route planning as JSON automation.
 - `pp_app_core_history_ui_tests` passed, covering undo/redo availability,
   no-op history commands, clear-history stack/memory state, memory-only clear,
   and negative metric rejection.