MEMO LOW SHIELD - 1.20.1

This version uses the vanilla 1.20.1 shield "blocking" item-model predicate.
When you right-click and raise the shield, Minecraft switches to a dedicated
blocking model that is now much smaller and pushed further out of your
first-person view, so it blocks far less of the screen while you block.

Recommended: Minecraft Java 1.20.1.
The vanilla item-model format changed in later releases, so one resource-pack
model cannot reliably cover every 1.20.x through 1.21.x release.

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## Changelog

### v2.0.0
* Blocking shield model shrunk further in first-person (scale 0.8 -> 0.55) and
  pushed further down/away (translation moved from [-1.5,-2.5,-4.5] to
  [-2.5,-3.5,-6]) — noticeably less screen blocked while blocking.
* Blocking shield texture made semi-transparent (~55% opacity) for an even
  clearer view. The normal (non-blocking) shield stays fully opaque in
  inventory and third-person so it still looks and reads normally.
* Recompressed all texture PNGs for smaller file size.
* Fixed pack icon: was a non-square 709x768 image (could look stretched in
  the pack list); now a proper square 128x128 icon.
* pack.mcmeta cleaned up and version-tagged.

### v1.0.0
* Initial release: dedicated first-person blocking model at scale 0.8.
