Kryvon Performance 16x v1.8 — Community PvP Refinement

Changes from v1.6.1:
- Refined six compact 16x16 sword textures.
- Improved sword edge readability with restrained highlights and dark borders.
- Reduced first-person fire overlay alpha by a small amount for clearer combat visibility.
- Preserved low-density fire and soul-fire animation frames.
- Preserved min_format 46 and max_format 75 compatibility metadata.
- Updated README and release description.

Performance boundaries:
- No shaders, mods, entity textures, sky files, models, or game-setting files were added.
- No fixed FPS increase is claimed.
- All custom textures remain 16x16 except pack.png.
