docs: drop stale 'required infrastructure' framing from ensure_root_agent

hive-c0re/src/auto_update.rs

@@ -167,7 +167,8 @@ pub async fn rebuild_agent(
 /// Auto-create the manager container on startup if it isn't already there.
 /// hive-c0re manages the manager end-to-end: operators no longer declare
 /// `containers.h-ruth` in their host NixOS config. Bypasses the approval
-/// queue — manager is required infrastructure. Idempotent.
+/// queue — the root/manager is auto-managed by default (an operator opt-out
+/// is a separate host setting). Idempotent.
 pub async fn ensure_root_agent(coord: &Arc<Coordinator>) -> Result<()> {
     let existing = lifecycle::list().await.unwrap_or_default();
     let current_rev = current_flake_rev(&coord.hyperhive_flake);