Function splitSecretWithCommitments

splitSecretWithCommitments(
    secret: string,
    n: number,
    threshold: number,
): { shares: Share[]; commitments: FeldmanCommitments; threshold: number }
Helper: split a secret and generate Feldman commitments in one step.
Parameters
- secret: string
  Hex-encoded 32-byte secret.
- n: number
  Total number of shares.
- threshold: number
  Minimum shares for reconstruction.
Returns { shares: Share[]; commitments: FeldmanCommitments; threshold: number }
Shares and commitments for verifiable secret sharing.
- shares: Share[]
  
  Generated shares for distribution.
- commitments: FeldmanCommitments
  
  Feldman VSS commitments for share verification.
- threshold: number
  
  Minimum shares required for reconstruction.
- Defined in protocols/threshold.ts:335