FallenSigh 453bc899fc feat(sha3): implement synchronous Keccak-f[1600] core with G/H/J modes ...

Phase 1.1 of ML-KEM sync rewrite.
- keccak_round.v: combinational theta/rho/pi/chi/iota
- keccak_core.v: 24-round pipeline, valid/ready
- sha3_top.v: sponge FSM, modes G(SHA3-512)/H(SHA3-256)/J(SHAKE-256)
- Verilator C++ TB + Python vector gen against reference
- Verified: 25/25 vectors bit-exact vs Python G()/H()/J()

2026-06-24 20:33:44 +08:00

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