xllamacpp

Update this xllamacpp repository's vendored llama.cpp checkout. Use when Codex is asked to refresh, update, or sync thirdparty/llama.cpp to the latest upstream llama.cpp release tag whose name starts with b, such as b9704, ensure its nested submodules are initialized and updated, fetch upstream llama.cpp tags, check whether the vendored checkout is already pinned to the latest b* release tag, build xllamacpp after a llama.cpp update, update Cython bindings for changed header fields and enum members, or synchronize generated llama-server changes into the owned Python server wrapper.