`contracts/build.sh` — missing verification that WASM hash matches after build

[Nabeelahh]

• Area: Smart Contract
• Description: build.sh compiles contracts but does not call generate-wasm-hash.sh or compare the resulting hash against a known-good value. A supply-chain attack or accidental dependency change would produce a different WASM silently. Integrate hash verification into the build script.
• File(s): contracts/build.sh, scripts/generate-wasm-hash.sh
• Priority: Medium
• Implementation & verification: Treat this as a protocol-safety change: check authorization, storage/ABI compatibility, ledger-time behavior, and emitted events before changing the implementation. Add a contract-level regression test for both the invalid and successful paths.
• **Required change set *: Change the relevant contract implementation together with its focused contract test, and include a type, error, or deployment-script adjustment only when required.

[Cedarich]

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

Hello maintainer can i take up this

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[drips-wave]

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

🧑‍💻 @Cedarich: 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 marked as completed by a Drips Wave moderator for @Cedarich as part of the Stellar Wave Program's 8th Wave 🥳

Moderator's reason: [Auto-assessed] The PR was accepted and merged by maintainer @Qoder-Voidd (mergedAt: 2026-08-26T12:57:51Z) with an explicit approval review (state: APPROVED). The code changes in contracts/build.sh successfully integrate WASM hash verification as requested by issue #277.

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ℹ️ Note: This issue was marked complete via moderation. Points were issued even though the GitHub issue remains open.