Implement dispute resolution voting weight

[hman38705]

Issue 068: Implement dispute resolution voting weight

Area: Contracts
Priority: Medium
Files: contracts/predict-iq/src/modules/disputes.rs

Problem

Dispute voting exists but weight calculation may not account for stake size. Equal-weight voting can be gamed.

Acceptance Criteria

• Vote weight is proportional to stake or reputation\n- Weight calculation is documented\n- Tests verify weighted outcomes\n- Weight manipulation is prevented

[Markodiba]

@Markodiba has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

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Congratulations, @Markodiba! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

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This issue has been completed by @Markodiba as part of the Stellar Wave Program's 4th Wave 🥳

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