FallenSigh 39dd36994b feat(poly_mul): implement synchronous PolyMul with base-case multiply ...

Phase 2.2: NTT-domain polynomial pointwise multiplication.
- basecase_mul.v: degree-1 base-case multiply (c0,c1) with Barrett
- poly_mul_zeta_rom.v: 128-entry zeta ROM for PolyMul
- poly_mul_sync.v: FSM (IDLE→LOAD 256 cycles→COMPUTE 256 cycles→DONE)

Verified: 5/5 vectors bit-exact vs Python PolyMul reference

2026-06-24 23:10:18 +08:00

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