feat: dispute-resolution v2

[Rampop01]

Description

This PR implements Dispute Resolution v2 (Issue #29).
It introduces Sybil resistance through reputation-weighted jury selection, and an honest-minority-slashing softening mechanism for "close calls".

Changes

• Configuration Updates: Config now requires reputation_contract, base_vote_weight, and close_call_margin_bps.
• Weighted Voting: Integrated a cross-contract call to the reputation contract to dynamically fetch juror reputation scores at commit-time, calculating and recording vote weights (max(base_vote_weight, reputation_score)).
• Vote Resolution by Weight: Updated the resolution logic to sum yes_weight and no_weight instead of just the raw vote count, making the jury selection more Sybil-resistant as reputation scores matter.
• Close Call Handling: When the margin between the winning and losing sides is less than or equal to close_call_margin_bps (e.g., a tight 5% vote margin), minority jurors are fully refunded their stake instead of being slashed. This encourages honest participation on hard disputes where the outcome isn't totally clear.
• Proportional Rewards: The slashed pot is now distributed to the winning jurors proportionally based on their individual weight, rather than an even split.
• Testing: Added new unit tests reflecting the updated weighted configuration, and explicitly testing the close_call_refunds_minority edge cases to ensure refunds are processed accurately without slashing in tight outcomes.

Closes #29

[meshackyaro]

Well done @Rampop01! Thank you for contributing to Guildworkman