Fix multi-answer MCQ consensus group collisions - #154
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Summary
< 10answer-index constraintMCQEval.get_summary()currently encodes a set using a fixed set of powers of ten plus the sum of the selected indices. As a result, distinct sets can collide. For example,{0, 3}and{1, 2}both receive the same group ID even though they are different answers.The new encoding places each selected index in its own decimal digit position, so distinct sets produce distinct group IDs. This keeps consensus and answer-group correctness calculations from combining different multi-answer responses.
The change is limited to the internal multi-answer group encoding.