Create animation documents from pano cli

docs/modernization/build-inventory.md

@@ -96,6 +96,8 @@ Known local toolchain state:
   parsing, and layout XML parse coverage.
 - `pano_cli inspect-image` reports PNG IHDR metadata as JSON and is covered by
   `pano_cli_inspect_png_metadata_smoke` with a tiny IHDR fixture.
+- `pano_cli create-document` supports `--frames` and `--frame-duration-ms` and
+  is covered by `pano_cli_create_animation_document_smoke`.
 - `panopainter_validate_shaders` validates the current combined GLSL shader
   files for one vertex stage marker, one fragment stage marker, valid marker
   order, and existing relative includes.

docs/modernization/roadmap.md

@@ -327,9 +327,10 @@ the paint blend reference. `pp_ui_core` has started with XML-layout-facing
 length parsing, color parsing, tinyxml-backed layout XML parsing, and invalid
 input tests.
 `pano_cli inspect-image` exposes PNG IHDR metadata as JSON, and
-`pano_cli parse-layout` exercises the XML layout path. Continue expanding
-document behavior toward legacy Canvas parity and then port OpenGL classes
-behind the renderer boundary.
+`pano_cli create-document` can create simple animation documents with explicit
+frame count/duration. `pano_cli parse-layout` exercises the XML layout path.
+Continue expanding document behavior toward legacy Canvas parity and then port
+OpenGL classes behind the renderer boundary.
 
 Implementation tasks:
 
@@ -574,6 +575,8 @@ Results:
 - `pp_ui_core_layout_value_tests` passed.
 - `pp_ui_core_layout_xml_tests` passed.
 - `pano_cli_create_document_smoke` passed.
+- `pano_cli_create_animation_document_smoke` passed and reports animation
+  duration 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