fix(tests): clear the SQLite pool before deleting the secrets path-guard temp dir — Windows sharing violation

src/ZB.MOM.WW.MxGateway.Tests/Configuration/SecretsStorePathGuardTests.cs

@@ -100,7 +100,24 @@ public sealed class SecretsStorePathGuardTests
         finally
         {
             Environment.SetEnvironmentVariable(SqlitePathVariable, original);
-            Directory.Delete(directory, recursive: true);
+
+            // The store runs in WAL mode with connection pooling, so a pooled handle can outlive the
+            // migration and keep secrets.db (plus its -wal/-shm sidecars) open. Windows refuses to
+            // delete a directory holding open files where Unix does not, so clear the pool first;
+            // the catch is belt-and-braces for a sidecar whose handle outlasts even that.
+            Microsoft.Data.Sqlite.SqliteConnection.ClearAllPools();
+            try
+            {
+                Directory.Delete(directory, recursive: true);
+            }
+            catch (IOException)
+            {
+                // Best-effort cleanup of the temp store; a locked file must not fail the test.
+            }
+            catch (UnauthorizedAccessException)
+            {
+                // Best-effort cleanup of the temp store; a locked file must not fail the test.
+            }
         }
     }