Contracts: Round contribution caps and anti-whale guardrails

[Cedarich]

Complexity: 150 points

Goal
Introduce configurable contribution caps for matching rounds to reduce skew during testnet experiments.

Acceptance Criteria

• Round-level caps are configurable.
• Over-cap contributions are rejected or bounded consistently.
• Cap state is queryable.
• Tests cover boundary values.

[rindicomfort]

@rindicomfort has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello,

This issue aligns well with my experience as a Web3 builder. I’ve worked on Celo-based applications with a focus on usability, smart contracts, stablecoin payments, and real-world adoption.

I also have contribution experience through OnlyDust, Drips Waves 1–5, and the GrantFox beta campaign. I’m confident I can deliver a clean and well-tested solution within 24 hours.

I’d be excited to contribute to this.

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

[drips-wave]

Congratulations, @rindicomfort! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @rindicomfort: 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 🌊