rename: prefix gateway projects/namespaces with ZB.MOM.WW + sln→slnx

Apply the ZB.MOM.WW. prefix to all gateway-side projects, folders,
.csproj/.sln contents, C# namespaces, using directives, generated proto
C# (csharp_namespace + checked-in generated files), InternalsVisibleTo
attributes, project-name string literals (LoadProject, .sln lookups,
worker exe paths, staticwebassets manifest), and the install/script/doc
references that point at any of the above. Migrate the solution from
.sln to .slnx via `dotnet sln migrate` and delete the old file.

External-runtime identifiers are intentionally NOT prefixed so external
configuration keeps working:
- GatewayMetrics.cs MeterName ("MxGateway.Server")
- DashboardAuthenticationDefaults Scheme/Policy ("MxGateway.Dashboard")
- GatewayRequestLoggingMiddleware logger category ("MxGateway.Request")
- StaRuntime thread name ("MxGateway.Worker.STA")
- appsettings.json root section "MxGateway" + env-var prefix
  MxGateway__... and secret-name MxGateway:ApiKeyPepper
- C:\ProgramData\MxGateway\ data dir paths

Also fixes two tests that were not rename-related but became visible
while validating the rename:

- WorkerLiveMxAccessSmokeTests.ShutDownAsync: cancellation that the
  gateway service correctly maps to RpcException(Cancelled) per gRPC
  convention was being misclassified as a stream fault. Added a sibling
  catch on RpcException with StatusCode.Cancelled.

- IntegrationTestEnvironment.ResolveRepositoryRoot: extracted IsRepositoryRoot
  and made it accept either a .git marker OR a .sln/.slnx next to src/
  so the worker-exe walker works in non-git working copies.

clients/proto/proto-inputs.json's protoRoot updated to point at
src/ZB.MOM.WW.MxGateway.Contracts/Protos.

Verified by `dotnet build` and a full `dotnet test` of the .slnx with
MXGATEWAY_RUN_LIVE_{MXACCESS,LDAP,GALAXY}_TESTS=1:
  Tests: 472/472 pass
  Worker.Tests: 280/280 pass (4 dev-rig [Fact(Skip=...)] skipped)
  IntegrationTests: 18/18 pass

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

src/ZB.MOM.WW.MxGateway.Server/Dashboard/DashboardMxValueFormatter.cs

@@ -0,0 +1,110 @@
+using System.Globalization;
+using ZB.MOM.WW.MxGateway.Contracts.Proto;
+
+namespace ZB.MOM.WW.MxGateway.Server.Dashboard;
+
+/// <summary>
+///     Formats an <see cref="MxValue"/> into the short, human-readable text the
+///     dashboard's Browse subscription panel shows. Kept separate from the
+///     view layer so the formatting rules are unit-testable without a worker.
+/// </summary>
+public static class DashboardMxValueFormatter
+{
+    /// <summary>Maximum array elements rendered inline before the value is truncated.</summary>
+    private const int MaxArrayElements = 24;
+
+    /// <summary>Formats the value payload of an <see cref="MxValue"/>.</summary>
+    /// <param name="value">The value to format; may be null.</param>
+    /// <returns>A display string — never null.</returns>
+    public static string FormatValue(MxValue? value)
+    {
+        if (value is null)
+        {
+            return "-";
+        }
+
+        if (value.IsNull)
+        {
+            return "(null)";
+        }
+
+        return value.KindCase switch
+        {
+            MxValue.KindOneofCase.BoolValue => value.BoolValue ? "true" : "false",
+            MxValue.KindOneofCase.Int32Value => value.Int32Value.ToString(CultureInfo.InvariantCulture),
+            MxValue.KindOneofCase.Int64Value => value.Int64Value.ToString(CultureInfo.InvariantCulture),
+            MxValue.KindOneofCase.FloatValue => value.FloatValue.ToString("G7", CultureInfo.InvariantCulture),
+            MxValue.KindOneofCase.DoubleValue => value.DoubleValue.ToString("G15", CultureInfo.InvariantCulture),
+            MxValue.KindOneofCase.StringValue => value.StringValue,
+            MxValue.KindOneofCase.TimestampValue => value.TimestampValue
+                .ToDateTimeOffset()
+                .UtcDateTime
+                .ToString("yyyy-MM-dd HH:mm:ss.fff 'UTC'", CultureInfo.InvariantCulture),
+            MxValue.KindOneofCase.ArrayValue => FormatArray(value.ArrayValue),
+            MxValue.KindOneofCase.RawValue => $"({value.RawValue.Length} bytes)",
+            _ => "-",
+        };
+    }
+
+    /// <summary>Formats the MXAccess data type of an <see cref="MxValue"/>.</summary>
+    /// <param name="value">The value whose data type to describe; may be null.</param>
+    /// <returns>The data-type name — never null. Arrays render as <c>Element[dims]</c>.</returns>
+    public static string FormatDataType(MxValue? value)
+    {
+        if (value is null)
+        {
+            return "-";
+        }
+
+        // A scalar carries its type in MxValue.DataType, but an array leaves
+        // that Unspecified and carries the element type on the MxArray itself.
+        return value.KindCase == MxValue.KindOneofCase.ArrayValue
+            ? FormatArrayDataType(value.ArrayValue)
+            : value.DataType.ToString();
+    }
+
+    private static string FormatArrayDataType(MxArray array)
+    {
+        string dimensions = array.Dimensions.Count > 0
+            ? string.Join(",", array.Dimensions)
+            : string.Empty;
+        return $"{array.ElementDataType}[{dimensions}]";
+    }
+
+    private static string FormatArray(MxArray array)
+    {
+        IReadOnlyList<string> elements = array.ValuesCase switch
+        {
+            MxArray.ValuesOneofCase.BoolValues =>
+                array.BoolValues.Values.Select(item => item ? "true" : "false").ToArray(),
+            MxArray.ValuesOneofCase.Int32Values =>
+                array.Int32Values.Values.Select(item => item.ToString(CultureInfo.InvariantCulture)).ToArray(),
+            MxArray.ValuesOneofCase.Int64Values =>
+                array.Int64Values.Values.Select(item => item.ToString(CultureInfo.InvariantCulture)).ToArray(),
+            MxArray.ValuesOneofCase.FloatValues =>
+                array.FloatValues.Values.Select(item => item.ToString("G7", CultureInfo.InvariantCulture)).ToArray(),
+            MxArray.ValuesOneofCase.DoubleValues =>
+                array.DoubleValues.Values.Select(item => item.ToString("G15", CultureInfo.InvariantCulture)).ToArray(),
+            MxArray.ValuesOneofCase.StringValues =>
+                array.StringValues.Values.Select(item => $"\"{item}\"").ToArray(),
+            MxArray.ValuesOneofCase.TimestampValues =>
+                array.TimestampValues.Values
+                    .Select(item => item.ToDateTimeOffset().UtcDateTime
+                        .ToString("yyyy-MM-dd HH:mm:ss 'UTC'", CultureInfo.InvariantCulture))
+                    .ToArray(),
+            MxArray.ValuesOneofCase.RawValues =>
+                array.RawValues.Values.Select(item => $"({item.Length} bytes)").ToArray(),
+            _ => [],
+        };
+
+        if (elements.Count == 0)
+        {
+            return "[]";
+        }
+
+        string body = string.Join(", ", elements.Take(MaxArrayElements));
+        return elements.Count > MaxArrayElements
+            ? $"[{body}, … {elements.Count} total]"
+            : $"[{body}]";
+    }
+}