- Replace OnceLock with Mutex<Option> for snapshot system in all 9 operations (undo/redo now works after redo)
- Fix import surface detection: scan actual packed block data for highest solid block instead of always using +15
- Apply brush strength threshold (< 0.3) in PaintOperation for natural edge falloff
- Remove broken t!() macro variant with variable substitution
- Complete level.dat with RandomSeed, GameType, Difficulty, Spawn, Time, DataPacks, etc.
- GPU viewport falls back to CPU renderer for multi-tile worlds
- Export supports Nether (DIM-1/region) and End (DIM1/region) dimension subdirectories
- Remove dead FloodOperation (duplicate of PaintOperation)
- Add log::warn for malformed dimension tile keys in serde
- Reduce CPU viewport base_size from 64 to 32 (4x fewer pixels)
- Simplify wasm-host host_get_seed to direct cast
- Add named constants for GPU buffer sizes
- Fix unused import warning in cli/main.rs
- cargo fmt
- Core world model (World, Dimension, Tile, Terrain, Platform)
- NBT reader/writer with full tag support
- Anvil region (.mca) format reader with chunk parsing
- Block palette compression and export
- Biome database with Minecraft 1.21 biomes
- CLI commands: new, import, export, info, render
- GUI application with egui (viewport, tools, undo/redo)
- Noise-based heightmap generation and editing operations
License: GPL-3.0-or-later
