refactor(mask): [PKG-MASK-03] isolate model runs and release stale work

test/README.md

@@ -2,6 +2,11 @@
 
 Use the pinned Node/Yarn toolchain from `../refactor/toolchain-setup.md`.
 
+`yarn test:danmuku-mask` runs candidate run cancellation/resource ownership plus
+frozen historical defects and public contracts. Candidate tests also run in
+`test:unit`; their controlled SDK, RAF and canvas hosts do not prove native model
+inference, GPU disposal or browser mask geometry. See the Mask architecture map.
+
 `yarn test:mediabunny` runs historical lifecycle observations, candidate load cancellation,
 and real SDK input parsing/track contracts; all are in `test:unit`. Candidate failures
 can be reproduced against the frozen main with `ARTPLAYER_MB_BASELINE=1`. This does not