Add Contract Authorization Boundary Tests

[Abd-Standard]

Description

Add focused tests verifying that privileged contract operations reject unauthorized callers.

Acceptance Criteria

Error behaviour is verified.

Unauthorized callers are rejected.

Authorized callers can execute permitted operations.

Tests cover each privileged entry point.

[olufunsoolutayo]

@olufunsoolutayo 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. Please assign it to me. Thanks.

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

[Sulex45]

@Sulex45 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi id love to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Sulex45 to this issue.

[drips-wave]

Congratulations, @Sulex45! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Sulex45: 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

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

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