[Contract] Issue #4: Add Validation for Beneficiary Basis Points Sum

[ONEONUORA]

Inside any plan updates, enforce that the sum of beneficiary allocation basis points (allocation_bps) adds up to exactly 10000 (100.00%). Throw an Error::InvalidBasisPoints if it mismatch.

[Chigybillionz]

Hi, I’ve reviewed this issue and I’m confident I can fix it. I’d like to take it on.

[real-venus]

Hi, I'd like to take this one on. Went through the issue and I'm familiar with the tech involved here — Soroban/Rust contract validation. I'll enforce that the sum of beneficiary allocation_bps equals exactly 10000 on every plan create/update path, using checked addition so no overflow can slip a bad total through, and return Error::InvalidBasisPoints on any mismatch — plus unit tests for the exact-100%, under, over, and empty-beneficiary cases. I move fast and deliver production-ready code — please assign to me and I'll get started immediately.

[anonfedora]

I'd like to work on this issue because it aligns with my experience building smart contracts with robust validation and invariant enforcement.

I have experience implementing financial logic, input validation, and comprehensive tests for contract state transitions. I'm confident in enforcing the allocation basis points constraint, returning the appropriate Error::InvalidBasisPoints, and ensuring plan updates remain consistent and secure.

[grantfox-oss]

🦊 GrantFox — @anonfedora has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #960)
2. Your PR will be reviewed by the Fracverse maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@anonfedora's PR #965 was approved and merged by @ONEONUORA.

🏆 @anonfedora: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (554 total points). Track your full progress on GrantFox.

👏 Great work, @anonfedora! Keep contributing to Fracverse.