Merge Shapes (union, combine, fragment, intersect, subtract); CI workflow running cargo xtask ci; control protocol and MCP docs

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -0,0 +1,52 @@
+name: ci
+
+# Quality gates for every push to main and every pull request: rustfmt, clippy (-D warnings),
+# tests, asset attribution, crate layering and the wasm32 check — `cargo xtask ci`.
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_dispatch:
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  CARGO_TERM_COLOR: always
+  # Same craft-fonts commit as release.yml (Latin presentation fonts).
+  CRAFT_FONTS_REF: 43913056ce82a3fdad0ef69f6b88d1dc922a8104
+
+jobs:
+  gates:
+    name: gates (${{ matrix.os }})
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-15]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check out craft-fonts
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
+        with:
+          repository: storytold/craft-fonts
+          ref: ${{ env.CRAFT_FONTS_REF }}
+          path: craft-fonts
+      - name: Linux build dependencies
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            libasound2-dev libxkbcommon-dev libwayland-dev libx11-dev libxrandr-dev libxi-dev libgl1-mesa-dev
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+          targets: wasm32-unknown-unknown
+      - uses: Swatinem/rust-cache@v2
+        with:
+          key: ci-${{ matrix.os }}
+      - name: cargo xtask ci
+        env:
+          CRAFT_FONTS_DIR: ${{ github.workspace }}/craft-fonts
+        run: cargo xtask ci