Expose image import simulation through pano cli

docs/modernization/roadmap.md

@@ -343,7 +343,9 @@ frame count/duration. `pano_cli simulate-document-edits` exercises pure
 layer metadata, frame reordering, active-index preservation, and tiny
 face-payload attachment. `pano_cli simulate-document-history` exercises the
 pure `pp_document::DocumentHistory` apply/undo/redo path and emits JSON state
-summaries. `pano_cli simulate-stroke` exercises the pure stroke sampler for
+summaries. `pano_cli simulate-image-import` decodes an embedded tiny PNG
+through `pp_assets` and attaches the resulting RGBA8 payload to `pp_document`.
+`pano_cli simulate-stroke` exercises the pure stroke sampler for
 scripted-stroke automation. `pano_cli simulate-stroke-script`
 loads stroke script fixtures, parses them through `pp_paint`, and samples every
 stroke. `pano_cli parse-layout` exercises the XML layout path. Continue
@@ -694,6 +696,8 @@ Results:
   state as JSON.
 - `pano_cli_simulate_document_history_smoke` passed and reports real
   `pp_document::DocumentHistory` apply/undo/redo state as JSON.
+- `pano_cli_simulate_image_import_smoke` passed and reports embedded PNG decode
+  plus `pp_document` face-payload attachment state as JSON.
 - `pano_cli_inspect_image_rejects_unsupported` passed as an expected failure
   test.
 - `pano_cli_inspect_png_metadata_smoke` passed and reports PNG metadata JSON
@@ -761,6 +765,9 @@ Results:
 - `pano_cli simulate-document-edits` exercises pure document layer/frame edit
   operations and emits JSON metadata, frame order, and face-payload state for
   agent automation.
+- `pano_cli simulate-image-import` exercises embedded PNG decode through
+  `pp_assets` and `pp_document` face-payload attachment through JSON
+  automation. Full file import/export remains a future `pano_cli` task.
 - PowerShell package-smoke wrapper validates the Windows CMake app executable
   and runtime `data/` copy.
 - Android arm64 configured with NDK 29.0.14206865 through the platform-build