Function destroy 

pub fn destroy(
    store: &LocalFsStore,
    flags: &OpFlags,
    env_id: &str,
    confirm: bool,
) -> Result<OpOutcome, OpError>

op env destroy <env_id> --confirm. Removes the env’s on-disk state.

Force-free safety net: the caller must pass confirm = true. The --confirm flag is the operator-binary’s responsibility; this library just enforces the gate.