Downside Up

First public release.

• Player-only gravity inversion: walk cave ceilings, jump downward, fall into the sky. The world stays vanilla.
• Underground start on a lush-cave ceiling with a guaranteed azalea tree and glow-berry vines near spawn.
• Azalea trees generate on lush cave floors as a renewable wood source.
• Thin-air band above Y=320: Slow Falling + poison; hold Jump to dive back toward the ground. Above Y=800 the sky is lethal.
• Water flows upward (configurable limit); vertical swimming is 3× vanilla; bubble columns work from ceilings; farmland hydrates from below.
• Fully mirrored physics: landing, fall damage, step-up, edge-sneak guard, ladders, knockback, poses, camera and model.
• Hostile spawns keep out of a ±16-block layer around you; the first day is peaceful.
• Everything configurable in config/downside_up.json; /downsideup operator command for diagnostics.