Adds support for BSpline curves, extruded linearly, and revolved

.github/workflows/ci.yml

@@ -0,0 +1,28 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    name: Build and test (ubuntu-latest)
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: 1.92.0
+
+      - name: Rust cache
+        uses: Swatinem/rust-cache@v2
+
+      - name: Build
+        run: cargo build --workspace --all-features --exclude gui
+
+      - name: Test
+        run: cargo test --workspace --all-features --exclude gui

examples/spline_linear_extrusion.step

@@ -0,0 +1,352 @@
+ISO-10303-21;
+HEADER;
+FILE_DESCRIPTION(('Open CASCADE Model'),'2;1');
+FILE_NAME('Open CASCADE Shape Model','2025-12-11T16:15:12',('Author'),(
+    'Open CASCADE'),'Open CASCADE STEP processor 7.8','build123d',
+  'Unknown');
+FILE_SCHEMA(('AUTOMOTIVE_DESIGN { 1 0 10303 214 1 1 1 1 }'));
+ENDSEC;
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