fix(lint): allow CJK fallback stacks documented in output-spec.md (#75)

Extend lint-skin.py font allowlist with the Hiragino/Noto/Yu Gothic
families from output-spec.md §4 and add adversarial tests including a
Yu Gothic UI rejection case.

Fixes #74

scripts/lint-skin.py

@@ -53,6 +53,10 @@ ALLOWED_FONTS = {
     "instrument serif",
     "geist",
     "geist mono",
+    "hiragino sans",
+    "noto sans jp",
+    "yu gothic",
+    "noto sans mono cjk jp",
     "system-ui",
     "sans-serif",
     "serif",