derive-validate-rejects-similar-to-out

Summary

When the system generates new derived beliefs, it checks whether a proposed belief is too similar to one that has already been retracted. This duplicate-detection behavior is already captured by another tracked claim about Jaccard similarity being used as the retraction guard, so this node exists mainly as a cross-reference confirming that the validation-rejects-similar-to-OUT behavior and the Jaccard-based guard are describing the same underlying mechanism.