Fix MICRON handling of unequal code lists - #1234
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Issue
MICRON treats individual codes as visits. Unequal diagnosis and procedure counts can crash concatenation, while padding alone can cause predictions to ignore the shorter list.
Fix
Pool flat code lists into one visit, preserve nested visit histories, and return zero reconstruction loss for single-visit inputs.
Notes
Regression tests verify that both features receive prediction gradients and nested inputs retain their visits.