//! Infinite procedural upgrade tree.
//!
//! Every node in the tree is a pure function of `(TREE_SEED, lot_x, lot_y)`.
//! Save state stores only the set of bought lot coordinates plus a pan
//! position; everything else (geometry, effects, names, costs, edges) is
//! regenerated on demand from the seed.
//!
//! The seed is a FNV-1a 64-bit hash of the literal string `"DEADBEEF_BANANA"`
//! — same value for every player, every install, forever. The tree itself is
//! the meta-game.
pub use ;
pub use TreeCoord;
pub use ;
pub use ;
pub use ;
pub use UpgradeTreeState;