Add a reproducible-build verification script for contract wasm binaries

[Idaonoli]

Scope

Add a script that builds each contract's wasm twice in clean environments and diffs the output byte-for-byte, so issuers deploying these contracts can independently verify the wasm they're deploying matches this repo's source.

Acceptance criteria

• A script builds each contract's wasm in two isolated environments (e.g. two Docker runs) and diffs the results
• The script/process is documented so an external party can reproduce it themselves

[abdulqoyumadegoke]

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

I would like to work on this issue, kindly assign it to me

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

[miracle605]

@miracle605 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello team,
I'd like to take on this task and feel free to assign it to me.
Looking forward to getting started!

ℹ️ Repo Maintainers: To accept this application, review their application or assign @miracle605 to this issue.

[drips-wave]

Congratulations, @miracle605! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @miracle605: 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.

Warning

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