Final per-consumer step of stage 2b. ST_E read two coeffs of a pair from one
bank combinationally; now serialized through a single registered read port
(e_rd_data_r) over a 4-cycle micro-phase e_ph: ph0 fetch c0, ph1 write b0 +
fetch c1, ph2 write b1, ph3 write b2. Matches sd_bram timing; +512 cyc on K=2
(one extra fetch per pair-stream). All polymem read consumers (ST_N, ST_M
load, ST_M acc, ST_E) are now registered-read. 11/11 KAT PASS, byte-exact.
FallenSigh
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