Add paint stroke script automation

docs/modernization/roadmap.md

@@ -317,7 +317,8 @@ document model, with corrupt/truncated/unsupported, extreme-dimension, and
 key/value limit tests.
 `pp_paint` has started with pure brush parameter validation/stamp evaluation,
 CPU reference math for the five current shader blend modes, and deterministic
-stroke spacing/interpolation. `pp_document` has
+stroke spacing/interpolation plus a pure text stroke-script parser.
+`pp_document` has
 started with a pure canvas/layer/frame model, layer metadata operations, frame
 move/duration queries, and layer/frame/undo-redo history invariant tests.
 `pp_renderer_api` has started with renderer-neutral
@@ -329,9 +330,11 @@ input tests.
 `pano_cli inspect-image` exposes PNG IHDR metadata as JSON, and
 `pano_cli create-document` can create simple animation documents with explicit
 frame count/duration, and `pano_cli simulate-stroke` exercises the pure stroke
-sampler for scripted-stroke automation. `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.
+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
+expanding document behavior toward legacy Canvas parity and then port OpenGL
+classes behind the renderer boundary.
 
 Implementation tasks:
 
@@ -568,6 +571,7 @@ Results:
 - `pp_paint_brush_tests` passed.
 - `pp_paint_blend_tests` passed.
 - `pp_paint_stroke_tests` passed.
+- `pp_paint_stroke_script_tests` passed.
 - `pp_document_tests` passed, including frame move, duration, and history
   invariants.
 - `pp_renderer_api_tests` passed, including shader descriptor validation.
@@ -585,6 +589,8 @@ Results:
 - `pano_cli_parse_layout_smoke` passed.
 - `pano_cli_simulate_stroke_smoke` passed and reports deterministic stroke
   sample counts/distances.
+- `pano_cli_simulate_stroke_script_smoke` passed and reports deterministic
+  aggregate stroke-script counts/distances.
 - `panopainter_validate_shaders` passed, validating 25 shader programs and 7
   shader includes for stage markers and include graph integrity.
 - PowerShell analyze automation returns JSON summaries and includes the shader