Add a coordinator webhook system for external integrations

[Marvy247]

Allow configuring webhooks for events: hand completed, player joined/left, tournament finished, proof verification failed. POST JSON payloads to configured URLs with retry logic.

[rindicomfort]

@rindicomfort has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello Maintainer,

Please I’d love to take this issue on. I’m a smart contract and full-stack developer with experience across OnlyDust, Drips Waves

My stack includes Rust, Soroban, Cairo, Solidity, and TypeScript. I can deliver a clean, tested, and well-documented solution within 24 hours of assignment.

Happy to start immediately. Thank You

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

[UFObject247]

@UFObject247 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello, Please, I will like to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @UFObject247 to this issue.

[drips-wave]

Congratulations, @UFObject247! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @UFObject247: 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 🌊

[drips-wave]

This issue has been completed by @UFObject247 as part of the Stellar Wave Program's 7th Wave 🥳

😎 @UFObject247: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.