Checkpoint 1: implement native subsystems and begin the gameplay manual

.github/workflows/ci.yml

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+name: Native and manual checks
+on:
+  push:
+  pull_request:
+permissions:
+  contents: read
+jobs:
+  native:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-24.04, windows-2025]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262
+      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065
+        with:
+          python-version: '3.12'
+      - name: Windows compiler environment
+        if: runner.os == 'Windows'
+        uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756
+      - name: Linux build tools
+        if: runner.os == 'Linux'
+        run: sudo apt-get update && sudo apt-get install -y clang ninja-build
+      - name: Configure Linux
+        if: runner.os == 'Linux'
+        run: cmake --preset linux-debug -DFASET_BUILD_RENDERER=OFF -DFASET_BUILD_EDITOR=OFF
+      - name: Configure Windows
+        if: runner.os == 'Windows'
+        run: cmake --preset windows-debug -DFASET_BUILD_RENDERER=OFF -DFASET_BUILD_EDITOR=OFF
+      - name: Build Linux
+        if: runner.os == 'Linux'
+        run: cmake --build --preset linux-debug --parallel 2
+      - name: Build Windows
+        if: runner.os == 'Windows'
+        run: cmake --build --preset windows-debug --parallel 2
+      - name: Test Linux
+        if: runner.os == 'Linux'
+        run: ctest --preset linux-debug
+      - name: Test Windows
+        if: runner.os == 'Windows'
+        run: ctest --preset windows-debug
+  manual:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262
+      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065
+        with:
+          python-version: '3.12'
+      - run: python -m pip install -r docs/requirements.txt
+      - run: python -m mkdocs build --strict