Add structural calculation worksheets

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

wood-joist/input.yaml

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+# Project name shown in the Typst report header.
+project: "Pompano Beach"
+# Person or organization shown in the Typst report footer.
+prepared_by: "Conemco Engineering"
+
+# Checked demands (ASD) supplied for verification. beam.typ derives the same
+# gravity loads and the test suite reconciles them to these values.
+w: "975 plf"              # total uniform line load   (w = (D + LL) B)
+wL: "650 plf"             # live uniform line load    (wL = LL B)
+M: "9871.875 ft * lbf"    # maximum moment            (M = w L^2 / 8)
+V: "4_387.5 lbf"           # support shear             (V = w L / 2)
+R: "4387.5 lbf"           # support reaction          (R = V)
+
+# Joist geometry: span (needed for the L/240 and L/360 deflection limits).
+span: "9 ft"
+
+# Joist cross-section (actual dimensions).
+width: "3.5 in"     # b
+depth: "9.5 in"     # d
+
+# Bearing length at each support (wood beam).
+bearing_length: "2.5 in"   # l_b
+# Distance from member end to near edge of bearing; must be >= 3 in for C_b to apply (NDS 3.10.4).
+bearing_end_distance: "3 in"   # l_end
+# Unbraced length of the compression edge used for beam stability.
+unbraced_length: "1 in"    # l_e
+
+# Species and grade label shown in the report.
+species_grade: "SP No. 2"
+
+# NDS 2018 reference design values (Spruce-Pine No. 2).
+Fb: "2400 psi"       # bending (F_b)
+Fv: "300 psi"        # shear (F_v)
+Fcp: "565 psi"       # compression perpendicular to grain (F_c-perp)
+E: "1700000 psi"     # modulus of elasticity (E)
+E_min: "510000 psi"  # adjusted modulus for stability (E'_min)
+
+# Adjustment factors (NDS Table 4.3.1). All 1.0 for this example.
+CD: 1     # load duration factor
+CM: 1     # wet service factor
+Ct: 1     # temperature factor
+CF: 1     # size factor (bending)
+Cr: 1     # repetitive member factor
+Cfu: 1    # flat use factor (bending)
+Ci: 1     # incising factor
+Cvr: 1    # shear reduction factor (NDS 3.4.3)