Verifiable challenge — Four designs, two runs
Run the base sweep twice from clean sessions and compare m09_results.csv. Then add a fourth design without duplicating construction or solution blocks:
/CLEAR,START
/FILNAME,m09_challenge,1
/UNITS,SI
n_cases=4
/INPUT,09_parametric_core,macThe fourth case (h = 0.14 m) is also analytically acceptable, but the selection must remain h = 0.12 m because it is the smallest suitable section.