[easy] Add unit tests for policy-types schema validation

[davedumto]

Summary

policy-types.ts validation helpers have thin test coverage, leaving edge cases unverified.

Requirements

• Add tests for all required field combinations
• Add tests for invalid type and out-of-range values
• Add tests for nested policy rule validation
• Ensure tests run as part of the existing test suite

[Emmycivity]

@Emmycivity has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

The issue is clear to me after reviewing the details, and I’m confident I can approach it efficiently and produce a quality solution.Thanks

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

[devfoma]

@devfoma has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Gm Chief, I would love to take on this issue. I'm a software engineer with over four years experience and i'm confident I can resolve this issue

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

[drips-wave]

Congratulations, @devfoma! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @devfoma: 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 🌊