feat: add CodeQL security analysis workflow (#40)

* feat: add CodeQL security analysis workflow

Adds automated security scanning for Python and JavaScript:
- Runs on PRs to main and pushes to main
- Weekly scheduled scan (Monday 6am UTC)
- Results visible in GitHub Security tab + PR checks
- Complements SonarCloud (code quality) with SAST (security)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: move concurrency inside job to avoid matrix jobs cancelling each other

Concurrency group now includes matrix.language so Python and
JavaScript analysis run independently without cancelling each other.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: abhizipstack

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,36 @@
+name: CodeQL
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+  schedule:
+    - cron: "0 6 * * 1" # Weekly Monday 6am UTC
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    runs-on: ubuntu-latest
+    if: "! github.event.pull_request.draft"
+    concurrency:
+      group: ${{ github.repository }}-${{ github.head_ref || github.sha }}-${{ github.workflow }}-${{ matrix.language }}
+      cancel-in-progress: true
+    permissions:
+      security-events: write
+      contents: read
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [python, javascript]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v3
+        with:
+          languages: ${{ matrix.language }}
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v3