pub fn prepare_hybrid_decode(prompt: &str)Expand description
Prepare hybrid hints before a decode turn (safe no-ops when inactive).
Call after any default publish_query_tensor so route/query are not wiped.
FastVerify skips mid-decode hybrid work (post-turn verify owns quality).
Do not enable route masks under mode=cuda alone. That used to OR in
prefer_tensor_core_gemm(), which published random prompt-hash KV masks and
destroyed attention (measured garbage decode 2026-07-24: repeated Ċ tokens).
Hybrid routing is for quant-graph / explicit QUALIA_HYBRID_ROUTE=1 only.