Maintenance/fix reputation validator

Description

The pitch.

### Remove redundant reputation validation loop

**Summary**

This PR removes a redundant loop in validate_reputation_scoring that had no observable effect on the function's behavior and updates the accompanying documentation to better reflect the validator's actual responsibility.

**Changes**

Removed the dead loop that iterated over cheaters after scores had already been updated.
Updated the validate_reputation_scoring docstring to accurately describe what the validator checks.
Fixed formatting issues identified during review.
Verified the project passes local CI checks.
Verification

The changes were validated by running the project's local CI sequence:

✅ uv sync
✅ ruff check
✅ ruff format --check
✅ pyright
✅ pytest (945 passed)

This change does not modify the validator's behavior. It is a code cleanup that removes redundant logic while preserving existing functionality.