Add stroke script CLI edge coverage

docs/modernization/roadmap.md

@@ -373,7 +373,8 @@ scripted-stroke automation. `pano_cli simulate-stroke-script`
 loads stroke script fixtures, parses them through `pp_paint`, and samples every
 stroke. `pano_cli apply-stroke-script` maps sampled script points into a
 bounded `pp_document` RGBA8 face payload, writes a PPI file, and verifies that
-the applied stroke payload survives inspect/load round-trip automation.
+the applied stroke payload survives inspect/load round-trip automation, with a
+rejection smoke test for unsafe tiny canvas dimensions.
 `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.
@@ -760,6 +761,9 @@ Results:
   stroke script can be parsed, sampled, applied to a pure `pp_document` face
   payload, written to PPI, inspected for the expected dirty-face box, and loaded
   back as decoded document pixel data.
+- `pano_cli_apply_stroke_script_rejects_tiny_canvas` passed as an expected
+  failure test, proving the stroke-script document command rejects dimensions
+  outside its bounded automation range before payload allocation.
 - `pano_cli_parse_layout_smoke` passed.
 - `pano_cli_simulate_stroke_smoke` passed and reports deterministic stroke
   sample counts/distances.