Palomar solution

The imported development proves FD1D.V5.Palomar.optimalDynamicMatchingUpperBound. Its local CompleteFormalizationAudit checks proof closure and the permitted axioms.

The independent Mathlib-only statement is retained in the upstream Challenge.lean. The upstream verification instructions describe its comparator check. Those comparison artifacts are not included in this Lean Pool import; the local proof-closure audit does not perform that comparison.