Add structural calculation worksheets

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

shore-post/shore-post.typ

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+#import "assets/sheet.typ": calcline, calcsheet, check
+
+#show: calcsheet.with(
+  title: "Shore Post Analysis and Design",
+  project: "Deer Creek Shoring",
+  prepared-by: "Conemco Engineering",
+)
+
+#let round(value, digits: 2) = calc.round(value, digits: digits)
+
+= Shore Post Analysis and Design
+
+Analysis to determine the axial demand for heavy duty shore post supporting the building's roof adjacent to the masonry walls to be repaired.
+
+#figure(
+  image("assets/tributary-areas.png", width: 69%),
+  caption: [Plan tributary area for highest loaded shore post pair.],
+)
+
+== Tributary Area
+
+#let Bx = 6.25
+#let By = 16
+#let At = Bx * By
+
+#calcline([$S_x = #Bx " ft"$], [Tributary width in x (Spacing in X)])
+#calcline([$S_y = #By " ft"$], [Tributary width in y (Spacing in Y)])
+#calcline(
+  [$A_t = S_x S_y = #round(At) " ft"^2$],
+  [Plan tributary area],
+)
+
+== Load Determination
+
+#let DL = 40.0
+#let SDL = 15.0
+#let LL = 20.0
+
+#let P = ((DL + SDL + LL) * At) / 2
+
+#calcline([$D = #DL " psf"$], [Dead load])
+#calcline([$D_("s") = #SDL " psf"$], [Superimposed dead load])
+#calcline([$L_L = #LL " psf"$], [Live load])
+
+#calcline(
+  [$P_max = display((( D + D_("s") + L_L) A_t ) / 2) = #round(P) " lbf"$],
+  [Maximum service load on one post],
+)
+
+== Shore Post Axial Capacity
+
+Considering AS550 Heavy Duty Shore post
+
+#let H = 14
+#let Pcap = 6400
+
+#calcline([$H = #H " ft"$], [Shore post height])
+#calcline([$P_("cap") = #Pcap " lbf"$], [AS550 Shore post capacity as per tech report])
+
+#v(8pt)
+#check(
+  "Shore post axial capacity",
+  P,
+  Pcap,
+  unit: "lbf",
+  demand-label: [$P_max$],
+  capacity-label: [$P_"cap"$],
+)