OmniCoder family runner.
Tesslate/OmniCoder-9B and siblings are Qwen3-coder-shaped and ship
as general.architecture = qwen3 in their GGUF converters. This
crate is a thin wrapper over [rlx_qwen3::Qwen3Runner] with arch
validation so users get a discoverable per-family entry point and
misrouted weights fail loudly at build().