Add unit tests for protocol fee recipient read

[Chucks1093]

Summary

Add focused tests for the protocol fee recipient read method.

Acceptance Criteria

• tests cover successful protocol fee recipient lookup
• assertions stay scoped to the read path
• no unrelated behavior changes

Contributor coordination: https://t.me/accesslayerorg

[Danitello123]

@Danitello123 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi
Please I would love to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Danitello123 to this issue.

[muhahahmad68]

@muhahahmad68 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Kindly assign this to me

ℹ️ Repo Maintainers: To accept this application, review their application or assign @muhahahmad68 to this issue.

[drips-wave]

Congratulations, @Danitello123! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @Danitello123: 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.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

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