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/Components/Pages/SessionDetailsPage.razor

@@ -0,0 +1,71 @@
+@page "/sessions/{SessionId}"
+@page "/dashboard/sessions/{SessionId}"
+@inherits DashboardPageBase
+
+<PageTitle>Dashboard Session</PageTitle>
+
+@if (Snapshot is null)
+{
+    <div class="empty-state">Loading session.</div>
+}
+else if (CurrentSession is null)
+{
+    <section class="dashboard-section">
+        <h1 class="h4 mb-3">Session Not Found</h1>
+        <p class="mb-0">The session is not present in the current snapshot.</p>
+    </section>
+}
+else
+{
+    <div class="dashboard-page-header">
+        <div>
+            <h1>Session Details</h1>
+            <div class="text-secondary"><code>@CurrentSession.SessionId</code></div>
+        </div>
+        <StatusBadge Text="@CurrentSession.State.ToString()" />
+    </div>
+
+    <section class="dashboard-section">
+        <div class="section-heading">
+            <h2>Session</h2>
+        </div>
+        <div class="table-responsive">
+            <table class="table table-sm dashboard-table details-table">
+                <tbody>
+                    <tr><th scope="row">Backend</th><td>@CurrentSession.BackendName</td></tr>
+                    <tr><th scope="row">Client identity</th><td>@DashboardDisplay.Text(CurrentSession.ClientIdentity)</td></tr>
+                    <tr><th scope="row">Client session</th><td>@DashboardDisplay.Text(CurrentSession.ClientSessionName)</td></tr>
+                    <tr><th scope="row">Client correlation</th><td>@DashboardDisplay.Text(CurrentSession.ClientCorrelationId)</td></tr>
+                    <tr><th scope="row">Opened</th><td>@DashboardDisplay.DateTime(CurrentSession.OpenedAt)</td></tr>
+                    <tr><th scope="row">Last activity</th><td>@DashboardDisplay.DateTime(CurrentSession.LastClientActivityAt)</td></tr>
+                    <tr><th scope="row">Lease expires</th><td>@DashboardDisplay.DateTime(CurrentSession.LeaseExpiresAt)</td></tr>
+                    <tr><th scope="row">Events received</th><td>@DashboardDisplay.Count(CurrentSession.EventsReceived)</td></tr>
+                    <tr><th scope="row">Last fault</th><td>@DashboardDisplay.Text(CurrentSession.LastFault)</td></tr>
+                </tbody>
+            </table>
+        </div>
+    </section>
+
+    <section class="dashboard-section">
+        <div class="section-heading">
+            <h2>Worker</h2>
+        </div>
+        <div class="table-responsive">
+            <table class="table table-sm dashboard-table details-table">
+                <tbody>
+                    <tr><th scope="row">Process id</th><td>@(CurrentSession.WorkerProcessId?.ToString(System.Globalization.CultureInfo.InvariantCulture) ?? "-")</td></tr>
+                    <tr><th scope="row">State</th><td><StatusBadge Text="@(CurrentSession.WorkerState?.ToString() ?? "-")" /></td></tr>
+                    <tr><th scope="row">Last heartbeat</th><td>@DashboardDisplay.DateTime(CurrentSession.LastWorkerHeartbeatAt)</td></tr>
+                </tbody>
+            </table>
+        </div>
+    </section>
+}
+
+@code {
+    [Parameter]
+    public string SessionId { get; set; } = string.Empty;
+
+    private DashboardSessionSummary? CurrentSession => Snapshot?.Sessions.FirstOrDefault(session =>
+        string.Equals(session.SessionId, SessionId, StringComparison.Ordinal));
+}