`tests/structural_divergence.rs`: a repo that nests a group under a different
parent than the server → `pic plan` shows it `diverged`; a bare apply is
refused (422); `--force-local-structure` reparents to the manifest shape;
`--adopt-server-structure` keeps the server placement. Design doc §6 records M2
shipped, leaving only per-env approval gating deferred.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
