Function run_convert_gguf_to_p64 

pub fn run_convert_gguf_to_p64(
    input: &Path,
    out_dir: &Path,
    page_log2: u16,
    layout: &str,
) -> Result<(), String>

Convert a GGUF import file to native .p64 + canonical .q42 model metadata.

Design: GGUF/safetensors are import formats only. Steady-state activation should prefer the converted container (see docs/plans/native-inference-p64-pipeline-remediation.md). The helper is CBOR-LD (self-describe CBOR), never JSON.