ci: add GitHub Actions workflow (lint + unit + e2e)

Three jobs:
- lint: ruff check on src/ and tests/
- unit: pytest across Python 3.10/3.11/3.12 (excludes e2e)
- e2e: Playwright browser tests against the wizard GUI (Chromium)

Concurrency group cancels in-progress runs on the same ref.

Made-with: Cursor

Author: jmjava

.github/workflows/ci.yml

@@ -0,0 +1,46 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - run: pip install ruff
+      - run: ruff check src/ tests/
+
+  unit:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.10", "3.11", "3.12"]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - run: pip install ".[dev]"
+      - run: pytest tests/ --ignore=tests/e2e -v --tb=short
+
+  e2e:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - run: pip install ".[dev]"
+      - run: playwright install --with-deps chromium
+      - run: pytest tests/e2e/ -v --tb=short