Reject unsafe numeric mandate fields

[karagozemin]

Goal\nReject NaN, infinite, fractional, or unsafe timestamp and price fields in session mandates.\n\n## Acceptance criteria\n- Validate all numeric mandate fields before use.\n- Return stable MandateError messages.\n- Add boundary and malformed-value tests.\n\n## Wave complexity (maintainer)\nHigh - 200 points

[richiesplug]

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I’m interested in contributing to this issue and would be happy to work on it

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[onyekachi66]

@onyekachi66 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I would like to work on this issue having worked on similar issues in the past. Please assign

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[ASIDISG]

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HI, please let me work on this issue.

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[Kappa16]

@Kappa16 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

PLEASE I would like to work on this issue, expect PR ASAP 🙏😞

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[Sam-Rytech]

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

Hi maintainer

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[emrekayat]

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

can ı work on this?

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[drips-wave]

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

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@emrekayat's PR #284 was approved and merged by @karagozemin.

🏆 @emrekayat: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (328 total points). Track your full progress on GrantFox.

👏 Great work, @emrekayat! Keep contributing to Sub-Rosa-Issue.