- Add japanese-themed city sprite sheet (PNG + PSD) and register in artwork config
- Switch several opponents to cyberpunk or japanese city themes
- Fix hut badge stale display by including tile coordinates in hut events and
repainting affected tiles immediately via repaintFromEvents
- Replace diagonal lattice world generation with hash-based jittered grid:
* Shield grassland now uses balanced 2x2 blocks hashed per position to remove
visible screen-space banding while preserving 50% density
* Special resources placed on jittered blocks with adjacency avoidance,
eliminating clumping and barren regions
- Update sprites.md paths and status markers to reflect completed sheets
- Expand verifyCivilization checks for shield density range and special placement
quality (no adjacency, balanced windows, no screen-column alignment)
- Update Tetris Attack dialogue with control instructions and typo fixes
