FallenSigh c4cd10c2c1 feat(ntt): implement synchronous NTT core with Barrett modular reduction ...

Phase 2.1: Merged Path00+Path01 NTT engine.
- barrett_mul.v: Barrett modular multiplication (a·b mod 3329)
- butterfly_unit.v: Cooley-Tukey/Gentleman-Sande butterfly
- zeta_rom.v: 128-entry ROM with bit-reversed roots of unity
- ntt_core.v: 7-layer NTT FSM, 256×12-bit register file
- ntt_sync.v: valid/ready streaming wrapper

Verified: 13/13 vectors bit-exact vs Python NTT/NTTInverse

2026-06-24 22:51:14 +08:00

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