ci: add custom CodeQL workflow to fix dynamic scan permissions failure

Author: Copilot

.github/workflows/codeql.yml

@@ -0,0 +1,51 @@
+name: CodeQL
+
+# The dynamic (GitHub-managed) CodeQL setup fails to upload SARIF results
+# because the auto-generated GITHUB_TOKEN lacks the `security-events: write`
+# permission. Providing an explicit workflow here tells GitHub to use this
+# instead of the dynamic scan, and lets us grant that permission directly.
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    - cron: "0 12 * * 1" # every Monday at 12:00 UTC
+
+permissions: {}
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write # required to upload SARIF results
+      actions: read # required for private repos; harmless for public ones
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [javascript-typescript]
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@8aad20d150bbac5944a9f9d289da16a4b0d87c1e # v4.36.2
+        with:
+          languages: ${{ matrix.language }}
+
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@8aad20d150bbac5944a9f9d289da16a4b0d87c1e # v4.36.2
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@8aad20d150bbac5944a9f9d289da16a4b0d87c1e # v4.36.2
+        with:
+          category: /language:${{ matrix.language }}