- Added boss-tiles.png and boss-tiles.psd files for new boss tileset
- Updated NNDungeon.json to include boss tileset configuration
- Modified main.js to comment out MenuScene and Gulch, keeping NNDungeon
- Updated NNDungeon.js to:
* Load boss-tiles spritesheet
* Adjust player starting position
* Update enemy creation logic to use boss-tiles when gid > 300
* Added special handling for NNBoss property
These changes prepare the game for implementing boss characters using the new tileset.
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