Add structural calculation worksheets

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

slab-on-grade/assets/sheet.typ

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+#let navy = rgb("#1a3a5f")
+#let muted = rgb("#626b73")
+#let pass = rgb("#1f6b45")
+#let fail = rgb("#9b2c2c")
+
+#let calcsheet(
+  title: "Structural Calculation",
+  project: "",
+  prepared-by: "",
+  body,
+) = {
+  set document(title: title, author: prepared-by)
+  set page(
+    paper: "us-letter",
+    margin: (x: 1in, top: 1.25in, bottom: 1in),
+    header: context {
+      grid(
+        columns: (1fr, 1fr),
+        align: (left, right),
+        image("../assets/logo.png", height: 30pt),
+        [#text(size: 9pt)[Project:] \
+          #text(size: 10pt, weight: "bold")[#project]],
+      )
+    },
+    footer: context {
+      set text(size: 8.5pt, fill: muted)
+      stack(
+        spacing: 4pt,
+        line(length: 100%, stroke: 0.5pt + muted),
+        [#prepared-by],
+      )
+    },
+  )
+  set text(font: "Libertinus Serif", size: 10pt, lang: "en")
+  set par(justify: true)
+  set heading(numbering: none)
+  show heading.where(level: 1): set text(size: 14pt, weight: "bold", fill: black)
+  show heading.where(level: 2): set text(size: 11pt, weight: "bold", fill: black)
+  show heading.where(level: 2): set block(above: 2em, below: 1em)
+  body
+}
+
+#let calcline(formula, note) = grid(
+  columns: (1.7fr, 1fr),
+  gutter: 4pt,
+  align: (left, left),
+  formula, text(size: 9pt, fill: muted, note),
+)
+
+#let check(label, demand, capacity, unit: "", ok: auto, demand-label: "Demand", capacity-label: "Capacity") = {
+  let utilization = demand / capacity
+  let passes = if ok == auto { utilization <= 1 } else { ok }
+  let color = if passes { pass } else { fail }
+  block(
+    breakable: false,
+    width: 100%,
+    stroke: 0.8pt + black,
+    inset: 8pt,
+    radius: 2pt,
+  )[
+    #grid(
+      columns: (1fr, auto),
+      [#text(weight: "bold")[#label]],
+      box(stroke: 0.8pt + color, inset: (x: 6pt, y: 2pt))[
+        #text(weight: "bold", fill: color)[#if passes { "OK" } else { "NOT OK" }]
+      ],
+    )
+    #v(4pt)
+    #grid(
+      columns: (1fr, auto),
+      [
+         #demand-label: #calc.round(demand, digits: 2) #unit #h(14pt)
+         #capacity-label: #calc.round(capacity, digits: 2) #unit
+      ],
+      [
+        D/C: #calc.round(utilization, digits: 2)
+      ],
+    )
+  ]
+}
+
+