feat: Add rename cooldown field and cloudprov rename

admin/internal/cloudprov/cloudprov.go

@@ -202,3 +202,20 @@ func ProjectedUsers(ctx context.Context, hqUserID string) ([]sharedmodels.User,
 	}
 	return users, nil
 }
+
+// RenameInstance changes a cloud instance's name and moves it to the slug that
+// name derives to.
+//
+// It writes `instances` and nothing else, so admin's control-plane write
+// boundary is unchanged. It issues no licence: a licence binds the instance
+// UUID, which a rename never touches.
+func RenameInstance(ctx context.Context, instanceID, name string) (*sharedmodels.Instance, error) {
+	return provision.RenameInstance(ctx, db.ControlDB(), instanceID, name)
+}
+
+// RestoreInstanceIdentity puts an instance's previous name and slug back, for a
+// caller unwinding a rename whose admin-side write failed. Leaving the two
+// databases disagreeing would have HQ print a host that is not the host.
+func RestoreInstanceIdentity(ctx context.Context, instanceID, name, slug string) error {
+	return provision.RestoreInstanceIdentity(ctx, db.ControlDB(), instanceID, name, slug)
+}