FallenSigh 209ca90fb1 feat(poly_arith): implement synchronous PolyAdd/PolySub streaming module
Phase 2.3: Polynomial modular addition and subtraction.
- poly_arith_sync.v: mode=0 add (a+b mod Q), mode=1 sub (a-b mod Q)
- Pure streaming (1 coeff/cycle, no BRAM needed)
- Uses pipeline_reg for valid/ready handshake

Verified: 10/10 vectors bit-exact vs Python reference
2026-06-24 23:12:59 +08:00
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