soroban-env-host-zephyr is used at run time in 3 crates (of which 1 optionally). It is a direct run-time dependency in 2 crates.

Depender (with downloads and own rev deps) soroban-env-host-zephyr version
1 zephyr-vm ^21.2.2
1 soroban-simulation-zephyr =21.2.2