feat(ai-valuation): On-chain confidence score alongside predicted value

[nanaf6203-bit]

Extend contracts/ai-valuation/src/lib.rs to expose both value and a normalized confidence (0-100). Document interpretation in docs/ai-valuation-system.md.

[Komelove]

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

This issue aligns closely with my experience in contracts, backend architecture, and frontend implementation. I’m keen to work on it and will keep the team informed of my progress along the way.

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

[ykargeee-bit]

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

Hi Maintainer,

I’m a full-stack developer, and I’d like to contribute to the task. I’ll implement it carefully and efficiently thoroughly understand requirements and edge cases
Communicate promptly about suggestions or improvements. And I will provide regular progress updates and address blockers
Align with project goals through feedback and clarification.

Thank you,

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

[drips-wave]

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

🧑‍💻 @ykargeee-bit: 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.

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