feat: add CI workflow for automated testing and linting; update method signatures in SlideBuilder for consistency

Author: ya7010

.github/workflows/ci.yml

@@ -0,0 +1,44 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.11.9']
+
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+        
+    - name: Install uv
+      run: |
+        curl -LsSf https://astral.sh/uv/install.sh | sh
+        echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+        
+    - name: Install dependencies
+      run: |
+        uv pip install --system .
+        uv pip install --system ".[dev]"
+        
+    - name: Format check
+      run: task format-check
+      
+    - name: Lint
+      run: task lint
+      
+    - name: Type check
+      run: task typecheck
+      
+    - name: Test
+      run: task test