0.0.20.8 - Xaero block-map compatibility, direct path

0.0.20.7 result:
- The class-resource Xaero-presence gate was not reliable under the Forge/ModLauncher module layout.
- A loaded Xaero installation could therefore receive no fallback map colors at all.

0.0.20.8:
- Removed the runtime Xaero-presence gate from the Phayriosis BlockState map-color fallback.
- Phayriosis blocks with an original zero/NONE map color now always receive a stable non-zero map color.
- Existing non-zero map colors remain unchanged.
- Added a soft @Pseudo mixin for XaeroLib BlockTextureColorUtils. If Xaero texture sampling resolves a
  Phayriosis block to RGB 0, the final sampled color receives the same family-based opaque fallback.
- No Xaero class is a hard dependency and no Xaero jar is modified.
- No entity radar or gameplay behavior changed.
