[Storage] Implement zero-address validation helper in storage

[p3ris0n]

Epic: RBAC Implementation (Wave 2)
Bucket: Architecture & Storage Foundations

📝 Description

Establish the foundational storage layer for zero-address validation helper in storage.

🛠️ Implementation Guide

1. Open contracts/admin storage module.
2. Implement is_zero_address(addr) helper.
3. Use in critical paths.

✅ Acceptance Criteria

• Code compiles and adheres to Soroban/Rust/TypeScript best practices.
• Unit tests cover both happy paths and expected error states.
• All CI/CD pipelines pass successfully.

[Delightech28]

@Delightech28 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I'd like to work on this

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[Goodness-0x]

@Goodness-0x has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi, I'd like to work on this issue.

I've gone through the requirements, understand the problem, and have the skills needed to implement a solution.

Could you please assign it to me?

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[Ajibose]

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

I would love to work on this

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[VeronicDev]

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

Hello maintainer kindly assign me this issue.

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[davidugorji]

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

Hello there Team, I would love the opportunity to work on this issue, i have gone through the project requirements and issue scope and i can get it done in max of 72 hours, thanks for the consideration.

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[drips-wave]

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

🧑‍💻 @VeronicDev: 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 @VeronicDev as part of the Stellar Wave Program's 8th Wave 🥳

😎 @VeronicDev: 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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