feat(routes-f): polynomial evaluator

[davedumto]

Summary

Evaluate a polynomial at given x values using Horner's method.

Requirements

• POST { coefficients: number[], x: number | number[] }
• coefficients highest-degree first
• Return { results }
• Tests verify Horner evaluation against expanded form

Scope Constraint - READ BEFORE STARTING

All files for this task must live inside app/api/routes-f/. This includes the route handler, helpers/utilities, types, and tests. Do NOT modify, import from, or add files to lib/, utils/, types/, components/, or anywhere else outside app/api/routes-f/. If you need shared logic, duplicate it inside your subfolder. Keeping everything scoped to this folder is intentional - it keeps these tasks independent and mergeable in any order.

[KevinMB0220]

@KevinMB0220 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi, I’m Kevin — a full-stack and smart contract engineer building on Stellar. I specialize in designing and shipping scalable, secure systems end-to-end, from Soroban smart contracts to production-ready backend infrastructure and user-facing applications.

I’ve worked on complex architectures involving automated agents, cross-chain logic, and data indexing, focusing on reliability, performance, and clean standards. My approach is very product-driven: I don’t just build contracts, I build complete systems that solve real user problems and can scale in production.

I’m especially interested in infrastructure, security, and automation — creating tools and frameworks that make it easier for other developers to build safely and efficiently on Stellar.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @KevinMB0220 to this issue.

[drips-wave]

Congratulations, @KevinMB0220! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @KevinMB0220: 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.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[KevinMB0220]

@davedumto can you close this issue?