feat: implement contract upgrade and migration hooks for state migration

[greatest0fallt1me]

Description:

Implement upgrade and migration hooks so that a new contract version can be deployed and state (or key config) can be migrated under admin control.

Requirements and Context:

• Must be secure, tested, and documented
• Should allow admin to set a new implementation address (upgrade pattern)
• Should support migration of config or critical state to new contract if needed
• Should emit upgrade/migration events
• Must restrict upgrade to admin and follow Soroban upgrade patterns
• Should document upgrade procedure and compatibility

Suggested Execution:

1. Fork the repo and create a branch

   git checkout -b feature/contract-upgrade-migration

2. Implement changes

   • Write contract: upgrade logic and migration entrypoints
   • Add upgrade_manager module: src/upgrade_manager.rs
   • Update storage and events; add documentation and NatSpec-style comments

3. Test and commit

   • Run tests; cover upgrade flow, migration, rollback if applicable
   • Include test output and security notes

Example Commit Message:

feat: implement contract upgrade and migration hooks for state migration

Guidelines:

• Minimum 95 percent test coverage
• Clear documentation
• Timeframe: 96 hours

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[YahKazo]

@YahKazo has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I have reviewed this issue and I would love to hop on this I promise to strictly follow the instruction and submit on time

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Congratulations, @YahKazo! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

🧑‍💻 @YahKazo: 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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[precious-akpan]

@precious-akpan has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

HI,

I would love to resolve this issue.

I have the experience.

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[Jagadeeshftw]

@Jagadeeshftw has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hi, I’d love to take on this issue! With my expertise in Rust, Stellar, and smart contract development, I can implement a clean and efficient solution.

🚀 Why Me?

• Proven Blockchain Experience – Hands-on work with Stellar, Solidity, and Rust, building secure and optimized smart contracts.
• Open Source Contributor – Actively contributed to 50+ open-source projects, showcasing adaptability and collaboration.
• Efficient & Reliable – I deliver high-quality, production-ready solutions quickly, ensuring security and scalability.

⏱ Timeline

I estimate completing this within 24 hours. Let me know if I can proceed!

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[Obiajulu-gif]

@Obiajulu-gif has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Can I work on this issue

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