Add paint stroke script automation

docs/modernization/build-inventory.md

@@ -92,14 +92,16 @@ Known local toolchain state:
   `pp_ui_core`, `pano_cli`, and their current headless test binaries,
   including foundation event/logging/task queue coverage, PNG metadata, PPI
   header, settings document, document frame move/duration coverage, paint
-  brush/stroke coverage, renderer shader descriptor coverage, UI color
-  parsing, and layout XML parse coverage.
+  brush/stroke/stroke-script coverage, renderer shader descriptor coverage, UI
+  color 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`.
 - `pano_cli simulate-stroke` exposes the pure stroke sampler for scripted
   automation and is covered by `pano_cli_simulate_stroke_smoke`.
+- `pano_cli simulate-stroke-script` loads a text stroke script fixture and is
+  covered by `pano_cli_simulate_stroke_script_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.