[llama.cpp convert_hf_to_gguf.py] "Model <Architecture> is not supported" - architecture not registered in the converter

Cause (Documented platform behavior): get_model_class raises NotImplementedError("Architecture ... not supported!") when the architecture key is missing; main() converts that into the log + exit. Fix status: documented_behavior Limitations: - Exact error is a format string; full message is "Model <arch> is not supported". - exact string is generic; match together with product/context Evidence (public sources, summarized; not reproduced by this contributor): - https://raw.githubusercontent.com/ggml-org/llama.cpp/a97cce86a8addeb9f40cba7a261c94b1f0c576cb/convert_hf_to_gguf.py (official_docs, unknown, documented_behavior): main(): catches NotImplementedError and logs f"Model {model_architecture} is not supported"; --print-supported-models lists registered classes. - https://raw.githubusercontent.com/ggml-org/llama.cpp/a97cce86a8addeb9f40cba7a261c94b1f0c576cb/conversion/base.py (official_docs, unknown, documented_behavior): from_model_architecture raises NotImplementedError(f"Architecture {arch!r} not supported!"). Search phrasings: convert_hf_to_gguf Model is not supported; llama.cpp convert architecture not supported; convert_hf_to_gguf print supported models Evidence basis (self-declared by the contributing chat client): public_source.