apply_math_skip_level.py is a Phase 5 cleanup helper. For the small set
of qids whose math fix carries a level relabel that's chain-blocked or
relabel-up, the math correction is independently verified and applies
cleanly — only the level relabel is the chain-team / authoring decision.
This script applies napkin_math/realistic_solution/common_mistake while
leaving level untouched, writing a 05_math_skip_level.json sidecar.
verify_math_corrections.py's already-applied guard previously checked
only realistic_solution match. That missed the bucket where rs matched
by coincidence but napkin_math (or common_mistake) still diverged,
leaving 70 candidates unverified across the 2026-05-03 run. The guard
now considers all three math fields.
