feat: Detect unhandled Result types in contract public functions

[Gbangbolaoluwagbemiga]

Add a static check to ensure all Results returned by internal functions are explicitly handled before the public contract boundary.

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[xqcxx]

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

Hi, I’d like to work on this issue. I have experience building full-stack applications with Soroban, handling both smart contract logic and frontend integration, and I’m comfortable debugging and delivering clean, maintainable solutions. I focus on clear communication and incremental updates to ensure smooth collaboration. I can complete this task within the next 2 - 4 hours

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

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This issue has been completed by @xqcxx as part of the Stellar Wave Program's 2nd Wave 🥳

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