FathomDB facade crate — re-exports the public Rust surface of fathomdb-engine.
The default (operator-feature-OFF) surface is the governed application
surface (dev/interfaces/rust.md § Governed-surface contract): it is
recovery-name-free and raw-SQL-free at the method level. The
operator/recovery seam (rebuild_*, excise_source, dump_*,
trace_source_ref, truncate_wal, verify_embedder, check_integrity,
safe_export, recompute_mean + their report types) is gated behind the
operator cargo feature, which fathomdb-cli enables. Gating, not deletion:
engine behavior is identical with the feature on. See AC-074
(dev/acceptance.md) + dev/design/slice-27-fix1-operator-gate-design.md.