Implement circuit-level randomness verification using VRF

[Marvy247]

Integrate a verifiable random function (VRF) into the deal circuit. Prove that the shuffle seed was derived from a VRF output. Enables public verifiability of randomness.

[MarcusDavidG]

@MarcusDavidG has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I can handle this issue and will like to work on it, Please assign thank you.

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[drips-wave]

Congratulations, @MarcusDavidG! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @MarcusDavidG: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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[drips-wave]

This issue has been completed by @MarcusDavidG as part of the Stellar Wave Program's 8th Wave 🥳

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