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Prove real and complex measurability under continuous composition - #722
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Fill Exercise 1.3.8(v) for real and complex functions. Pulling an open set back through the continuous outer function gives an open set, whose preimage under the measurable inner function is Lebesgue measurable.
The proofs use the pre-existing real/complex TFAE characterizations, which remain admitted upstream.
Validation:
lake build Analysis.MeasureTheory.Section_1_3_2passes on this branch. Statements are unchanged, and no new proof placeholders or axioms are introduced. The repository still contains pre-existing admitted lemmas.