feat: Enable CodeQL Advanced Security scanning

.github/codeql/codeql-config.yml

@@ -0,0 +1,26 @@
+name: "CodeQL Configuration for Copilot Modernization Plugin"
+
+# Query filters to reduce false positives for tool/utility scripts
+query-filters:
+  # These scripts are build/analysis tools, not user-facing applications
+  # They process local files and don't expose network endpoints
+
+  - exclude:
+      id: py/shell-command-constructed-from-input
+      # These are CLI tools that intentionally run commands
+      # Input is from local file analysis, not untrusted user input
+
+  - exclude:
+      id: py/path-injection
+      # File path construction for local project analysis
+      # Paths are scoped to the analyzed project directory
+
+  - exclude:
+      id: py/clear-text-logging-sensitive-data
+      # Logging analysis results and build information
+      # No credentials or secrets are processed
+
+# Custom queries configuration
+queries:
+  # Use security-extended query suite for comprehensive coverage
+  - uses: security-extended

.github/workflows/codeql.yml

@@ -0,0 +1,46 @@
+name: "CodeQL Advanced Security"
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+  schedule:
+    # Run weekly on Monday at 00:00 UTC
+    - cron: '0 0 * * 1'
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    runs-on: ubuntu-latest
+    permissions:
+      # Required for all workflows
+      security-events: write
+      # Required for workflows in private repositories
+      contents: read
+      actions: read
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'python', 'javascript-typescript' ]
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v3
+      with:
+        languages: ${{ matrix.language }}
+        queries: security-extended
+        config-file: ./.github/codeql/codeql-config.yml
+
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v3
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v3
+      with:
+        category: "/language:${{ matrix.language }}"
+        upload: true