chore(.github/workflows): add CI workflows for commit lint, dependency audit, and install script testing

.github/workflows/commitlint.yml

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+name: Commit Lint
+
+on:
+  pull_request:
+    branches: [main, dev]
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  commit-lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+
+      - name: Install commitlint
+        run: npm install -g @commitlint/cli @commitlint/config-conventional
+
+      - name: Lint commits
+        run: npx commitlint --from ${{ github.event.pull_request.base.sha }} --to ${{ github.event.pull_request.head.sha }} --verbose

.github/workflows/dependency-audit.yml

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+name: Dependency Audit
+
+on:
+  push:
+    branches: [main, dev]
+  pull_request:
+    branches: [main, dev]
+  schedule:
+    - cron: "0 8 1 * *"
+
+permissions:
+  contents: read
+  security-events: write
+
+jobs:
+  pip-audit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v4
+
+      - name: Export requirements from uv
+        run: uv export --no-hashes -o requirements-audit.txt
+
+      - uses: pypa/gh-action-pip-audit@release/v1
+        with:
+          input: requirements-audit.txt
+
+      - name: Cleanup
+        if: always()
+        run: rm -f requirements-audit.txt

.github/workflows/install-test.yml

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+name: Install Script Test
+
+on:
+  push:
+    branches: [main, dev]
+    paths:
+      - "install.sh"
+      - "src/window/globalmenu/**"
+      - "src/window/switcher/app-capture/**"
+      - "pyproject.toml"
+      - "uv.lock"
+  pull_request:
+    branches: [main, dev]
+    paths:
+      - "install.sh"
+      - "src/window/globalmenu/**"
+      - "src/window/switcher/app-capture/**"
+      - "pyproject.toml"
+      - "uv.lock"
+
+permissions:
+  contents: read
+
+jobs:
+  syntax-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Check install.sh syntax
+        run: bash -n install.sh
+
+      - name: Install shellcheck
+        run: sudo apt-get install -y shellcheck
+
+      - name: Lint install.sh
+        run: shellcheck install.sh
+
+  c-build:
+    runs-on: ubuntu-latest
+    container:
+      image: archlinux:latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install build dependencies
+        run: |
+          pacman -Syu --noconfirm gcc make pkgconf gtk3 meson ninja
+
+      - name: Compile globalmenu shim
+        run: |
+          gcc -shared -fPIC -O2 -o /tmp/libmenu_button_shim.so \
+            src/window/globalmenu/libmenu_button_shim.c \
+            $(pkg-config --cflags --libs gtk+-3.0) -ldl
+
+      - name: Compile app-capture
+        run: |
+          cd src/window/switcher/app-capture
+          meson setup builddir --wipe
+          meson compile -C builddir
+
+  python-compile:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - name: Compile all Python source
+        run: python3 -m compileall -q src