sanity check heuristic heap tcache detection

    @property
    @override
    def thread_cache(self) -> pwndbg.aglib.heap.glibc_structs.TcachePerthreadStruct | None:
        """Locate a thread's tcache struct. We try to find its address in Thread Local Storage (TLS) first,
        and if that fails, we guess it's at the first chunk of the heap.
        """