Sweep out the group-card navigation nothing reaches any more

tests/DodoSSH.Client.App.Layout.Tests/HostGridTests.cs

@@ -33,8 +33,8 @@ namespace DodoSSH.Client.App.Layout.Tests;
 /// editor or the chosen-hosts menu's "Change group…" rather than a drag. The card-navigation surface this
 /// was written against — <c>OpenGroupCommand</c>, <c>VisibleGroups</c>, <c>GroupTrail</c>,
 /// <c>SelectedGroup</c>, <c>GroupCrumbViewModel</c>, and the drag command <c>MoveHostToGroupCommand</c> dragged
-/// onto — is no longer reached from either head's markup; <c>GroupFilter</c> stays, since group-heading
-/// commands still fall back to it. Section-level
+/// onto — is no longer on <c>VaultViewModel</c> at all, confirmed unreachable from both heads' markup before
+/// removal; <c>GroupFilter</c> stays, since group-heading commands still fall back to it. Section-level
 /// coverage — flattening order, the headerless invariant, per-section collapse, filter composition, monogram
 /// stability — is in <c>HostSectionsTests</c> instead, which is where a heading now belongs.
 /// </para>