ESSOS 0.18 (superseded by 0.18.1 — do not use)

Superseded by 0.18.1 — missing dependency floors; do not use.

Tagged from main before #88 merged, so 0.18 does not carry the dependency floors. Use 0.18.1 (tag v0.18.1), which declares equinox>=0.13.3, jaxtyping>=0.2.24, diffrax>=0.7.0, jax>=0.6.2 and jaxlib>=0.6.2.