FallenSigh 03b4707879 feat(top): add shared keccak variants, arbiter, and mlkem_top integration ...

- sha3_chain_top_shared.v: external keccak_core interface (6 ports)
- sample_cbd_sync_shared.v: shared keccak variant (6 ports)
- sample_ntt_sync_shared.v: shared keccak variant (6 ports)
- keccak_arbiter.v: fixed-priority arbiter for 3 keccak consumers
- mlkem_top.v: 1403-line monolithic FSM with KeyGen/Encaps/Decaps

Architecture:
  keccak_arbiter → keccak_core → keccak_round (shared)
  sha3_chain_top_shared (consumer 0)
  sample_cbd_sync_shared (consumer 1)
  sample_ntt_sync_shared (consumer 2)
  sha3_top (separate, own keccak_core)
  rng_sync, ntt_core, poly_arith, poly_mul, comp_decomp, mod_add
  sd_bram for polynomial storage

All original RTL files preserved unchanged.

2026-06-26 03:35:37 +08:00

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