Develop and troubleshoot the OpenVINO GGUF frontend (src/frontends/gguf) and the llama.cpp ggml-openvino backend that uses it. Use when checking whether a .gguf or mmproj model is supported; when a .gguf file is rejected as an unsupported architecture; when enabling a llama.cpp model family (llama, qwen, gemma, phi, MoE, hybrid/recurrent) through arch_registry, DecoderBuilder, a ModelBuilder or an ArchitectureExtension; when adding a vision/audio projector or ProjectorExtension; when conversion fails with "Translation for operation type GGML_OP_* is not implemented" or an op translator/op_case in src/op/ needs work; when making a converted model stateful or GenAI/PagedAttention-ready; or when a GGUF model converts but gives garbage, drifting tokens, a llama.cpp mismatch or a decode-only shape failure; or when running or resuming GGUF frontend, backend and GenAI validation batches. Not for general llama.cpp usage or unrelated build/CI failures.