Rot Client Dark Overworld

Rot Tools darkened overworld block, item, entity, and GUI textures for
Minecraft 26.2. These overlay files are Rot-authored conversions.

Any remaining vanilla Minecraft path that is an unmodified Mojang atlas or
font sheet (including `assets/minecraft/textures/font/unicode_page_*.png`)
stays under the Minecraft EULA. Rot Client does not claim those pages as
original art and does not relicense them.

This pack is not a copy of another community client's source tree.
