Constant THREE_LANE_PROJECTED_PIPELINE_REGISTER_BITS 

pub const THREE_LANE_PROJECTED_PIPELINE_REGISTER_BITS: usize = _; // 153_792usize

Projected round-data, tag, and valid register bits in the full farm.

This excludes the circular-memory pointers and the registered RAM outputs. It is a source-level count, not a mapped flip-flop count.