ST_ENC_U computes u[i] per row in 3 sub-phases reusing shared u_pmul + u_ntt:
sub0 MAC : sum_j A_hat[j][i] o y_hat[j] (TRANSPOSE: slot=j*K+i) -> NTT-domain
psum in bank_t rel slot UPSUM=1 (e2 in slot 0), init 0 at j==0
sub1 INTT: INTT(psum) mode=1 (built-in x3303) in place in bank_t[UPSUM]
sub2 ADD : u[i][w] = psum[w] + e1[i][w] mod Q -> bank_se rel (K+i), over e1
y_hat (bank_se 0..K-1) preserved for V. ntt_core mode + input muxed for the
INTT sub-phase; bank_a/se/t read+write ports extended for all 3 sub-phases.
Fixed a duplicate 'assign bse_we' (stale + new both present -> ADD writes
X-dropped); collapsed to one. Verified (K=2 c0) u[0..1] == ml-kem-r golden
(transpose + INTT + e1 all correct); E0/E1/E3 pass, E2 trimmed to e2 (e1
consumed into u, transitively checked by E4); K=3/4 no timeout.
FallenSigh
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