review(b2-waveA): /raw auto-expand enterprise roots; friendly create-race + delete failures; auth-guard classifies /raw + dev demo

Wave-A reviewer findings (no Critical/High):
- M-2: GlobalRaw auto-expands Enterprise roots so the Cluster level is visible on load (mirrors GlobalUns.ExpandStructural); clusters stay lazily collapsed.
- L-1: create mutations route SaveChanges through SaveCreateAsync — a lost sibling-name race (filtered-unique-index clash) becomes a friendly failure instead of an uncaught DbUpdateException.
- L-2: SaveDeleteAsync no longer leaks raw EF/SQL text; operator-friendly guidance.
- L-5: RawNode.ChildCount doc clarified (direct children only).
- Regression fix: PageAuthorizationGuardTests classifies the two new routable pages (/raw → ConfigEditor, /dev/context-menu-demo → AuthenticatedRead).
M-1 (ordinal vs SQL-collation sibling uniqueness) assessed benign: name indexes use the DB default collation and the server-side pre-check runs under that same collation, so pre-check and index agree — no case-variant rows can coexist, so runtime ordinal RawPath keying never collides.

Claude-Session: https://claude.ai/code/session_01LVneM3eh1UtJxEisFXgmox

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Uns/RawNode.cs

@@ -69,7 +69,7 @@ public sealed class RawNode
     /// <summary>Whether a Driver/Device node is enabled (drives the enable/disable menu label + styling); true otherwise.</summary>
     public bool Enabled { get; init; } = true;
 
-    /// <summary>Direct child count (for the badge). For a device this is its tag-group + tag count.</summary>
+    /// <summary>Direct child count (for the badge) — for a device, its root tag-groups + root tags (direct children only, not the whole subtree).</summary>
     public int ChildCount { get; set; }
 
     /// <summary>