review(Driver.Cli.Common): drop dead FormatStatus branch + timestamp-kind test

Re-review at 7286d320. -009: remove unreachable name-is-null branch in FormatStatus +
invariant test. -010: pin DateTimeKind.Unspecified FormatTimestamp behavior.

src/Drivers/Cli/ZB.MOM.WW.OtOpcUa.Driver.Cli.Common/SnapshotFormatter.cs

@@ -156,9 +156,9 @@ public static class SnapshotFormatter
             };
         }
 
-        return name is null
-            ? $"0x{statusCode:X8}"
-            : $"0x{statusCode:X8} ({name})";
+        // name is always non-null here: the named shortlist assigns it directly, and
+        // the severity-class fallback above assigns one of "Good" / "Uncertain" / "Bad".
+        return $"0x{statusCode:X8} ({name})";
     }
 
     /// <summary>Formats a UTC timestamp as an ISO 8601 string, or "-" if null.</summary>