Mine Piece: New Era 1.64.0

- Harald is uniformly resized to 58.5 blocks tall, exactly 75% of Loki's 78 block height. His collision height and body width are updated to match the resized rig.
- Saturn, Warcury, Marcus Mars and Ju Peter no longer display the inherited sword or its sheath. This is a visual equipment change; their inventories, attacks and damage are preserved.
- Garling's Griffon uses its actual handle centre as the attachment point. The grip is lowered from the wrist into the palm and follows his animated arm.
- Human and yokai Elder meshes use static GPU buffers with palettes of 24 animated bones. The tested meshes require 17 body submissions in total instead of 285 individual bone submissions, while keeping every vertex, normal, UV and native animation rig.
- Elder mesh warmup is staged across ticks and continues during normal play. Garling and Harald are included. Shader packs retain the existing compatible rendering fallback.
- Prior Luffy transformations, lightning immunity, Joyboy damage, Bajrang and Kraken fixes, and Elbaph Gear 5 accessories are retained from 1.63.0. No dependencies are added.

Validation: Forge/Minecraft native bindings and MinePiece 14/15 linkage pass. Native VCBB/GeckoLib model checks pass. The production GLSL compiles/links in headless OpenGL and matches the old shader across 359,688 native mesh vertices, with zero numerical difference. Equipment checks exercise the production grip/suppression code with explicit entity/inventory/render-call fixtures and real pose matrices. No live Minecraft client playtest or in-game FPS measurement was performed.
