tlock: add cross-implementation test vectors for sealBid

[karagozemin]

Summary

Add golden test vectors for sealBid / auditor blob encoding in packages/tlock so seals produced by the SDK can be verified against a known-good fixture.

Motivation

tlock sealing is security-critical. Deterministic vectors protect against silent regressions in encoding, nonce handling, or the H = sha256(value‖nonce) binding.

Acceptance criteria

• Committed fixture with input (value, nonce, round, identity) and expected sealed output digest.
• Test that re-seals and compares against the fixture.
• Test asserting a modified nonce changes the binding hash.
• Documented how to regenerate vectors.

[Sufiyan-MSA]

Hi, I’d be happy to work on this. Pls assign.

[afeezorobsco-cyber]

i would like to work on this issue

[onyemaechiezekiel9]

@onyemaechiezekiel9 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello, I have gone through the issue and I would love to work on this swiftly

ℹ️ Repo Maintainers: To accept this application, review their application or assign @onyemaechiezekiel9 to this issue.

[Ugooweb]

@Ugooweb has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I am confident that I can implement this having worked on something similar in the past

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Ugooweb to this issue.

[drips-wave]

Congratulations, @Ugooweb! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @Ugooweb: 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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