Add config parsing tests with CI

.github/workflows/test.yml

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+name: Test
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
+      - name: Install dependencies
+        run: pip install pytest toml
+      - name: Run tests
+        run: pytest -v

tests/test_configs.py

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+import json
+import pathlib
+
+try:
+    import tomllib  # Python 3.11+
+except ModuleNotFoundError:  # pragma: no cover - fallback for older versions
+    import toml as tomllib
+
+
+def test_load_configs():
+    repo_root = pathlib.Path(__file__).resolve().parents[1]
+    karabiner_path = repo_root / ".config" / "karabiner" / "karabiner.json"
+    with karabiner_path.open('r', encoding='utf-8') as f:
+        json.load(f)
+
+    starship_path = repo_root / ".config" / "starship.toml"
+    with starship_path.open('rb') as f:
+        tomllib.load(f)