chore: add GitHub Actions CI/CD workflows

.github/labeler.yml

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+shader:
+  - changed-files:
+      - any-glob-to-any-file: "src/common/shader/**"
+
+mesh:
+  - changed-files:
+      - any-glob-to-any-file: "src/common/mesh/**"
+
+texture:
+  - changed-files:
+      - any-glob-to-any-file: "src/common/texture/**"
+
+material:
+  - changed-files:
+      - any-glob-to-any-file: "src/common/material/**"
+
+ecs:
+  - changed-files:
+      - any-glob-to-any-file: "src/common/ecs/**"
+
+components:
+  - changed-files:
+      - any-glob-to-any-file: "src/common/components/**"
+
+renderer:
+  - changed-files:
+      - any-glob-to-any-file: "src/common/systems/**"
+
+core:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "src/common/application.*"
+          - "src/common/asset-loader.*"
+          - "src/main.cpp"
+
+config:
+  - changed-files:
+      - any-glob-to-any-file: "config/**"
+
+tests:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "src/states/*-test-*"
+          - "config/*-test/**"
+          - "expected/**"
+
+build:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "CMakeLists.txt"
+          - "justfile"
+          - "flake.nix"
+          - "flake.lock"
+          - ".github/workflows/**"
+
+docs:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "docs/**"
+          - "**/*.md"
+
+assets:
+  - changed-files:
+      - any-glob-to-any-file: "assets/**"
+
+vendor:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "vendor/**"
+          - ".gitmodules"

.github/workflows/build.yml

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+name: Build
+
+on:
+  push:
+    branches: [main]
+    paths-ignore:
+      - "docs/**"
+      - "**.md"
+      - ".agent/**"
+      - ".editorconfig"
+  pull_request:
+    branches: [main]
+    paths-ignore:
+      - "docs/**"
+      - "**.md"
+      - ".agent/**"
+      - ".editorconfig"
+
+concurrency:
+  group: build-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: Build (${{ matrix.name }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: Ubuntu / GCC
+            os: ubuntu-latest
+            generator: Ninja
+            shell: bash
+          - name: Windows / MSVC
+            os: windows-latest
+            generator: "Visual Studio 17 2022"
+            shell: pwsh
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+          fetch-depth: 1
+
+      - name: Install dependencies (Linux)
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+            cmake ninja-build \
+            libgl1-mesa-dev \
+            libx11-dev libxrandr-dev libxi-dev \
+            libxinerama-dev libxcursor-dev
+
+      - name: Cache build directory
+        uses: actions/cache@v4
+        with:
+          path: build
+          key: build-${{ matrix.os }}-${{ hashFiles('CMakeLists.txt', 'src/**') }}
+          restore-keys: |
+            build-${{ matrix.os }}-
+
+      - name: Configure (Debug)
+        run: >
+          cmake -S . -B build
+          -G "${{ matrix.generator }}"
+          -DCMAKE_BUILD_TYPE=Debug
+          -DCMAKE_COLOR_DIAGNOSTICS=ON
+          -DCMAKE_POLICY_VERSION_MINIMUM=3.5
+        shell: bash
+
+      - name: Build
+        run: cmake --build build --config Debug -j 4
+        shell: bash

.github/workflows/format-check.yml

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+name: Format Check
+
+on:
+  pull_request:
+    branches: [main]
+    paths:
+      - "src/**"
+
+jobs:
+  clang-format:
+    name: clang-format
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Install clang-format
+        run: sudo apt-get update && sudo apt-get install -y clang-format
+
+      - name: Check formatting
+        run: |
+          FAILED=0
+          FILES=$(find src/ -type f \( -name "*.cpp" -o -name "*.hpp" -o -name "*.h" \))
+
+          for file in $FILES; do
+            # Generate the diff between current and formatted versions
+            DIFF=$(clang-format "$file" | diff -u "$file" - || true)
+            if [ -n "$DIFF" ]; then
+              echo "::error file=$file::File is not formatted according to .clang-format"
+              echo "$DIFF"
+              echo ""
+              FAILED=1
+            fi
+          done
+
+          if [ "$FAILED" -eq 1 ]; then
+            echo ""
+            echo "Some files are not properly formatted."
+            echo ""
+            echo "Fix locally with:"
+            echo '  find src/ -type f \( -name "*.cpp" -o -name "*.hpp" -o -name "*.h" \) | xargs clang-format -i'
+            exit 1
+          fi
+
+          echo "All files are properly formatted."

.github/workflows/labeler.yml

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+name: PR Labeler
+
+on:
+  pull_request_target:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  labeler:
+    name: Auto-label PR
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/labeler@v5
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/opengl.yml

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+name: OpenGL
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - "src/**"
+      - "assets/shaders/**"
+      - "config/**"
+      - "expected/**"
+  pull_request:
+    branches: [main]
+    paths:
+      - "src/**"
+      - "assets/shaders/**"
+      - "config/**"
+      - "expected/**"
+
+concurrency:
+  group: opengl-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  shader-validation:
+    name: Shader Validation
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Install glslang
+        run: sudo apt-get update && sudo apt-get install -y glslang-tools
+
+      - name: Validate GLSL shaders
+        run: |
+          SHADERS=$(find assets/shaders -type f \( -name "*.vert" -o -name "*.frag" -o -name "*.geom" -o -name "*.comp" \))
+          echo "Found $(echo "$SHADERS" | wc -l) shaders"
+          echo "$SHADERS" | xargs glslangValidator