pub fn set_decode_phase(p: Option<usize>)Expand description
TOKEN-PIPELINE phase (step37 chain): while Some(p), enter_main binds each gpu’s
phase-p stream instead of its main stream, so alternate tokens’ rank-local work rides
disjoint streams. Cross-stream ordering is the SETTER’s job (the multi-stream law
above): the chain wires per-layer KV events between phases.