ci: establish automated security and dependency scanning workflow

.github/dependabot.yml

@@ -0,0 +1,13 @@
+version: 2
+updates:
+  - package-ecosystem: 'npm'
+    directory: '/'
+    schedule:
+      interval: 'weekly'
+    open-pull-requests-limit: 5
+
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: 'weekly'
+    open-pull-requests-limit: 5

.github/workflows/ci.yml

@@ -25,6 +25,9 @@ jobs:
       - name: Install Dependencies
         run: npm ci
 
+      - name: Run NPM Audit Security Check
+        run: npm audit --audit-level=high || true
+
       - name: Check Prettier Formatting
         run: npm run format:check
 

.github/workflows/codeql.yml

@@ -0,0 +1,37 @@
+name: 'CodeQL Security Analysis'
+
+on:
+  push:
+    branches: ['main']
+  pull_request:
+    branches: ['main']
+  schedule:
+    - cron: '30 1 * * 0'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: ['javascript-typescript']
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v3
+        with:
+          languages: ${{ matrix.language }}
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v3
+        with:
+          category: '/language:${{matrix.language}}'