Contract: Add recovery tests for failed transaction sequences

[Junirezz]

Summary

Ensure the contract can safely recover from partial or failed state transitions.

Problem

Complex transaction paths may leave the vault in an inconsistent state if failures are not handled.

Acceptance Criteria

• Sequence deposits, withdrawals, and fee changes under failure conditions
• Verify state remains valid after interruption
• Add regression tests for reprocessing and retry conditions
• Document expected recovery process for developers

[Mayor-XM]

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

Hi maintainer, I would like to work on this issue, and I would Document expected recovery process for developers

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

[edrizxabdulganiyu-blip]

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

Hello Maintainer, I’ve reviewed the issue description and I’m confident I can work on it effectively. Please assign it to me.

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

[Samuel1-ona]

@Samuel1-ona has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I can work on this.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Samuel1-ona to this issue.

[drips-wave]

Congratulations, @Samuel1-ona! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Samuel1-ona: 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 completed by @Samuel1-ona as part of the Stellar Wave Program's 8th Wave 🥳

😎 @Samuel1-ona: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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