Add structural calculation worksheets

Collection of engineering calculation projects (Python + Typst), each with
input, calc script, tests, results, and generated PDF where available.

wood-stud-column/input.yaml

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+# Project name shown in the Typst report header.
+project: "Interior Bearing Wall"
+# Person or organization shown in the Typst report footer.
+prepared_by: "Conemco Engineering"
+
+# Axial load (ASD) checked against the allowable column capacity.
+P: "400 lbf"
+
+# Stud geometry (actual dimensions of a nominal 2x4).
+length: "6 ft"          # L, total stud length
+width: "1.5 in"         # b, actual 2x4 width
+depth: "3.5 in"         # d, actual 2x4 depth
+Ke: 1.0                 # effective-length factor, pinned-pinned (NDS 3.7.1.2 / Appendix G)
+
+# Species and grade label shown in the report. "SP" is read as Southern Pine
+# (SYP) per NDS Supplement Table 4B; confirm if SPF or SPF-S was intended.
+species_grade: "SP (Southern Pine) No. 2"
+
+# NDS Supplement reference design values for Southern Pine (SYP) No. 2, dimension lumber.
+Fc: "1450 psi"          # compression parallel to grain (F_c)
+E: "1400000 psi"        # modulus of elasticity (E)
+E_min: "510000 psi"     # 5th-percentile modulus (E_min)
+
+# Adjustment factors (NDS Table 4.3.1). All 1.0 except size factor for this example.
+CD: 1     # load duration factor (1.0 = normal/occupancy duration, NDS 2.3.2)
+CM: 1     # wet service factor (dry, moisture < 19%, NDS 4.3.3)
+Ct: 1     # temperature factor (< 100 deg F, NDS 4.3.4)
+CF: 1.15  # size factor for compression, 2x4 (NDS 4.3.6)
+Ci: 1     # incising factor (NDS 4.3.8)