Resolve IntegrationTests-022..024

IntegrationTests-022 (Conventions): ResolveRepositoryRoot now throws
InvalidOperationException when the walk exhausts without finding a root
marker, with a message naming the start directory, the expected markers
(src/, .git, *.sln, *.slnx), and the MXGATEWAY_LIVE_MXACCESS_WORKER_EXE
escape hatch. Replaces the silent fallback to
Directory.GetCurrentDirectory() that previously masked misconfiguration.
New regression test
ResolveRepositoryRoot_NoMarkers_ThrowsInvalidOperationExceptionNamingStartAndMarkers
in IntegrationTestEnvironmentTests asserts the throw and the message
contents. TDD red→green confirmed.

IntegrationTests-023 (Testing coverage): DashboardLdapLiveTests's
AuthenticateAsync_AdminInGwAdminGroup_Succeeds now asserts that the
authenticated principal carries a ClaimTypes.Role claim with value
DashboardRoles.Admin in addition to the existing LdapGroupClaimType
assertion. A regression in MapGroupsToRoles (returning an empty list or
missing the RDN fallback) would now surface here. Gated by
MXGATEWAY_RUN_LIVE_LDAP_TESTS.

IntegrationTests-024 (Conventions): Option (b) — extracted within
IntegrationTests. New file TestSupport/NullDashboardEventBroadcaster.cs
(public type, private ctor, singleton Instance). The inline class at
the bottom of WorkerLiveMxAccessSmokeTests is gone; the file now imports
the shared type. Matches the unit-test project's Tests-007 / Tests-021 /
Tests-025 pattern while keeping the two test projects independently
buildable (no shared test-helpers project crossing module boundaries).

Verification: dotnet build src/ZB.MOM.WW.MxGateway.IntegrationTests
clean; 19/19 integration tests passing (live MxAccess + LDAP + Galaxy).

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

src/ZB.MOM.WW.MxGateway.IntegrationTests/IntegrationTestEnvironment.cs

@@ -97,9 +97,22 @@ public static class IntegrationTestEnvironment
         return defaultValue;
     }
 
-    /// <summary>Resolves the root directory of the repository by walking parents for a src/ directory next to either a .git marker or a .sln/.slnx file.</summary>
+    /// <summary>
+    /// Resolves the root directory of the repository by walking parents for a
+    /// <c>src/</c> directory next to either a <c>.git</c> marker or a
+    /// <c>.sln</c>/<c>.slnx</c> file. Throws <see cref="InvalidOperationException"/>
+    /// when no root is found so a misconfigured run fails fast with an actionable
+    /// message rather than silently falling back to the current working directory
+    /// (which previously produced a misleading "worker exe not found" pointing at
+    /// a fabricated path — see IntegrationTests-022). The
+    /// <see cref="LiveMxAccessWorkerExecutableVariableName"/> environment variable
+    /// remains the escape hatch for unusual deployments.
+    /// </summary>
     /// <param name="startDirectory">Starting directory to search from.</param>
-    /// <returns>The repository root path, or the start directory if not found.</returns>
+    /// <returns>The repository root path.</returns>
+    /// <exception cref="InvalidOperationException">
+    /// Thrown when the parent walk exhausts without finding a repository root.
+    /// </exception>
     internal static string ResolveRepositoryRoot(string startDirectory)
     {
         DirectoryInfo? directory = new(startDirectory);
@@ -113,7 +126,11 @@ public static class IntegrationTestEnvironment
             directory = directory.Parent;
         }
 
-        return Directory.GetCurrentDirectory();
+        throw new InvalidOperationException(
+            $"Could not resolve repository root by walking parents of '{startDirectory}'. "
+            + "Expected to find a directory containing a 'src' subdirectory next to either a '.git' marker "
+            + "or a '*.sln' / '*.slnx' file in 'src'. "
+            + $"Set the '{LiveMxAccessWorkerExecutableVariableName}' environment variable to bypass repository-root resolution.");
     }
 
     private static bool IsRepositoryRoot(DirectoryInfo directory)