Phase 6.2 Stream D (data layer) — ValidatedNodeAclAuthoringService with write-time invariants

Ships the non-UI piece of Stream D: a draft-aware write surface over NodeAcl
that enforces the Phase 6.2 plan's scope-uniqueness + grant-shape invariants.
Blazor UI pieces (RoleGrantsTab + AclsTab refresh + SignalR invalidation +
visual-compliance reviewer signoff) are deferred to the Phase 6.1-style
follow-up task.

Admin.Services:
- ValidatedNodeAclAuthoringService — alongside existing NodeAclService (raw
  CRUD, kept for read + revoke paths). GrantAsync enforces:
    * Permissions != None (decision #129 — additive only, no empty grants).
    * Cluster scope has null ScopeId.
    * Sub-cluster scope requires a populated ScopeId.
    * No duplicate (GenerationId, ClusterId, LdapGroup, ScopeKind, ScopeId)
      tuple — operator updates the row instead of inserting a duplicate.
  UpdatePermissionsAsync also rejects None (operator revokes via NodeAclService).
  Violations throw InvalidNodeAclGrantException.

Tests (10 new in Admin.Tests/ValidatedNodeAclAuthoringServiceTests):
- Grant rejects None permissions.
- Grant rejects Cluster-scope with ScopeId / sub-cluster without ScopeId.
- Grant succeeds on well-formed row.
- Grant rejects duplicate (group, scope) in same draft.
- Grant allows same group at different scope.
- Grant allows same (group, scope) in different draft.
- UpdatePermissions rejects None.
- UpdatePermissions round-trips new flags + notes.
- UpdatePermissions on unknown rowid throws.

Microsoft.EntityFrameworkCore.InMemory 10.0.0 added to Admin.Tests csproj.

Full solution dotnet test: 1097 passing (was 1087, +10). Phase 6.2 total is
now 1087+10 = 1097; baseline 906 → +191 net across Phase 6.1 (all streams) +
Phase 6.2 (Streams A, B, C foundation, D data layer).

Stream D follow-up task tracks: RoleGrantsTab CRUD over LdapGroupRoleMapping,
AclsTab write-through + Probe-this-permission diagnostic, draft-diff ACL
section, SignalR PermissionTrieCache invalidation push.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/ZB.MOM.WW.OtOpcUa.Admin/Services/ValidatedNodeAclAuthoringService.cs

@@ -0,0 +1,117 @@
+using Microsoft.EntityFrameworkCore;
+using ZB.MOM.WW.OtOpcUa.Configuration;
+using ZB.MOM.WW.OtOpcUa.Configuration.Entities;
+using ZB.MOM.WW.OtOpcUa.Configuration.Enums;
+
+namespace ZB.MOM.WW.OtOpcUa.Admin.Services;
+
+/// <summary>
+///     Draft-aware write surface over <see cref="NodeAcl"/>. Replaces direct
+///     <see cref="NodeAclService"/> CRUD for Admin UI grant authoring; the raw service stays
+///     as the read / delete surface. Enforces the invariants listed in Phase 6.2 Stream D.2:
+///     scope-uniqueness per (LdapGroup, ScopeKind, ScopeId, GenerationId), grant shape
+///     consistency, and no empty permission masks.
+/// </summary>
+/// <remarks>
+///     <para>Per decision #129 grants are additive — <see cref="NodePermissions.None"/> is
+///     rejected at write time. Explicit Deny is v2.1 and is not representable in the current
+///     <c>NodeAcl</c> row; attempts to express it (e.g. empty permission set) surface as
+///     <see cref="InvalidNodeAclGrantException"/>.</para>
+///
+///     <para>Draft scope: writes always target an unpublished (Draft-state) generation id.
+///     Once a generation publishes, its rows are frozen.</para>
+/// </remarks>
+public sealed class ValidatedNodeAclAuthoringService(OtOpcUaConfigDbContext db)
+{
+    /// <summary>Add a new grant row to the given draft generation.</summary>
+    public async Task<NodeAcl> GrantAsync(
+        long draftGenerationId,
+        string clusterId,
+        string ldapGroup,
+        NodeAclScopeKind scopeKind,
+        string? scopeId,
+        NodePermissions permissions,
+        string? notes,
+        CancellationToken cancellationToken)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(clusterId);
+        ArgumentException.ThrowIfNullOrWhiteSpace(ldapGroup);
+
+        ValidateGrantShape(scopeKind, scopeId, permissions);
+        await EnsureNoDuplicate(draftGenerationId, clusterId, ldapGroup, scopeKind, scopeId, cancellationToken).ConfigureAwait(false);
+
+        var row = new NodeAcl
+        {
+            GenerationId = draftGenerationId,
+            NodeAclId = $"acl-{Guid.NewGuid():N}"[..20],
+            ClusterId = clusterId,
+            LdapGroup = ldapGroup,
+            ScopeKind = scopeKind,
+            ScopeId = scopeId,
+            PermissionFlags = permissions,
+            Notes = notes,
+        };
+        db.NodeAcls.Add(row);
+        await db.SaveChangesAsync(cancellationToken).ConfigureAwait(false);
+        return row;
+    }
+
+    /// <summary>
+    ///     Replace an existing grant's permission set in place. Validates the new shape;
+    ///     rejects attempts to blank-out to None (that's a Revoke via <see cref="NodeAclService"/>).
+    /// </summary>
+    public async Task<NodeAcl> UpdatePermissionsAsync(
+        Guid nodeAclRowId,
+        NodePermissions newPermissions,
+        string? notes,
+        CancellationToken cancellationToken)
+    {
+        if (newPermissions == NodePermissions.None)
+            throw new InvalidNodeAclGrantException(
+                "Permission set cannot be None — revoke the row instead of writing an empty grant.");
+
+        var row = await db.NodeAcls.FirstOrDefaultAsync(a => a.NodeAclRowId == nodeAclRowId, cancellationToken).ConfigureAwait(false)
+                  ?? throw new InvalidNodeAclGrantException($"NodeAcl row {nodeAclRowId} not found.");
+
+        row.PermissionFlags = newPermissions;
+        if (notes is not null) row.Notes = notes;
+        await db.SaveChangesAsync(cancellationToken).ConfigureAwait(false);
+        return row;
+    }
+
+    private static void ValidateGrantShape(NodeAclScopeKind scopeKind, string? scopeId, NodePermissions permissions)
+    {
+        if (permissions == NodePermissions.None)
+            throw new InvalidNodeAclGrantException(
+                "Permission set cannot be None — grants must carry at least one flag (decision #129, additive only).");
+
+        if (scopeKind == NodeAclScopeKind.Cluster && !string.IsNullOrEmpty(scopeId))
+            throw new InvalidNodeAclGrantException(
+                "Cluster-scope grants must have null ScopeId. ScopeId only applies to sub-cluster scopes.");
+
+        if (scopeKind != NodeAclScopeKind.Cluster && string.IsNullOrEmpty(scopeId))
+            throw new InvalidNodeAclGrantException(
+                $"ScopeKind={scopeKind} requires a populated ScopeId.");
+    }
+
+    private async Task EnsureNoDuplicate(
+        long generationId, string clusterId, string ldapGroup, NodeAclScopeKind scopeKind, string? scopeId,
+        CancellationToken cancellationToken)
+    {
+        var exists = await db.NodeAcls.AsNoTracking()
+            .AnyAsync(a => a.GenerationId == generationId
+                        && a.ClusterId == clusterId
+                        && a.LdapGroup == ldapGroup
+                        && a.ScopeKind == scopeKind
+                        && a.ScopeId == scopeId,
+                cancellationToken).ConfigureAwait(false);
+
+        if (exists)
+            throw new InvalidNodeAclGrantException(
+                $"A grant for (LdapGroup={ldapGroup}, ScopeKind={scopeKind}, ScopeId={scopeId}) already exists in generation {generationId}. " +
+                "Update the existing row's permissions instead of inserting a duplicate.");
+    }
+}
+
+/// <summary>Thrown when a <see cref="NodeAcl"/> grant authoring request violates an invariant.</summary>
+public sealed class InvalidNodeAclGrantException(string message) : Exception(message);