fix(cluster): gossiped-role predicates compare case-insensitively — a miscased peer no longer un-elects the Primary

src/Core/ZB.MOM.WW.OtOpcUa.Cluster/ClusterRoleInfo.cs

@@ -23,8 +23,13 @@ public sealed class ClusterRoleInfo : IClusterRoleInfo, IDisposable
     private readonly string? _clusterRole;
     private readonly string? _clusterId;
     private readonly object _lock = new();
-    private readonly Dictionary<string, Member?> _roleLeaders = new(StringComparer.Ordinal);
-    private readonly Dictionary<string, HashSet<Member>> _membersByRole = new(StringComparer.Ordinal);
+    // R3-04 (01/C-9, census row 17): OrdinalIgnoreCase — Akka compares gossiped role names ordinally,
+    // so a PEER running an older build can still gossip a miscased plain role during a rolling
+    // upgrade. Keying these by the exact-cased role string would leave MembersWithRole("driver") and
+    // RoleLeader("driver") blind to a peer that gossips "Driver", the same class of gap #532 closed
+    // for _localRoles above.
+    private readonly Dictionary<string, Member?> _roleLeaders = new(StringComparer.OrdinalIgnoreCase);
+    private readonly Dictionary<string, HashSet<Member>> _membersByRole = new(StringComparer.OrdinalIgnoreCase);
     private IActorRef? _subscriber;
 
     /// <summary>Initializes a new instance of the ClusterRoleInfo class.</summary>

src/Core/ZB.MOM.WW.OtOpcUa.Cluster/RoleParser.cs

@@ -153,4 +153,15 @@ public static class RoleParser
 
         return roles;
     }
+
+    /// <summary>True when a GOSSIPED role list carries <paramref name="role"/>, compared
+    /// case-insensitively. Akka compares role names ordinally and a PEER may be running an older
+    /// build that gossips a verbatim 'Driver' (archreview 01/C-9), so every predicate over
+    /// <c>Member.Roles</c> goes through here rather than <c>List.Contains</c>.</summary>
+    /// <param name="gossipedRoles">The gossiped role list (e.g. <c>Member.Roles</c>).</param>
+    /// <param name="role">The role to test for.</param>
+    /// <returns>True when <paramref name="role"/> is present, case-insensitively.</returns>
+    public static bool GossipedRolesHave(IEnumerable<string>? gossipedRoles, string role) =>
+        gossipedRoles is not null
+        && gossipedRoles.Any(r => string.Equals(r, role, StringComparison.OrdinalIgnoreCase));
 }