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Align bit widths used by Noir circuits #1503

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@cedoor

Commitment hashing in the DKG/threshold stack depends on how many bits of each polynomial limb get folded into the transcript. Right now those widths can drift between Noir configs and e3-zk-helpers, and between related circuits:

  • C1 vs C5: pk-generation vs pk-aggregation paths should agree on PK / user-data bit sizing so downstream commitment checks stay meaningful.
  • C2 vs C4 vs C6: share encryption, per-share share decryption, and aggregate share decryption need consistent per-share vs aggregate widths; the secure preset in particular had a share-decryption msg bit count inconsistent with share encryption.

Goal: align all of the above so Rust, Noir, and E2E tests use one coherent story for bit widths and CRT conversion, and add a canonical CrtPolynomial::to_fhe_polynomial (or equivalent) so tests do not reimplement RNS packing.

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