[D03] generate_inp.py: BCs + Load + Run ccx

[Siddardth7]

Due: March 29 | Day 3 of 14

• Add *SHELL SECTION, COMPOSITE block using IM7/8552 values from data/materials.csv
• Add *BOUNDARY for simply-supported conditions on all 4 edges
• Add *DLOAD for uniform pressure matching CLT baseline load
• Add *NODE PRINT, U and *EL PRINT, S output requests
• Generate fea/baseline.inp and run: ccx fea/baseline
• Confirm solver exits cleanly — check for baseline.dat in output

✅ Done when: ccx fea/baseline runs without error. fea/baseline.inp committed.