ci: establish enterprise GitHub Actions automation baseline

.github/workflows/ci.yml

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+name: CI
+on: [push, pull_request]
+permissions: {contents: read}
+concurrency: {group: ci, cancel-in-progress: true}
+jobs:
+  verify:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/cache@v4
+        with:
+          path: ~/.cache/pip
+          key: deps-${{ github.sha }}
+      - name: Detect stack and verify
+        shell: bash
+        run: |
+          set -euo pipefail
+          if find . -name '*.py' -print -quit | grep -q .; then
+            python -m pip install --upgrade pip
+            for f in requirements.txt requirements-dev.txt requirements/dev.txt; do [ -f "$f" ] && python -m pip install -r "$f"; done
+            python -m pip install pytest pytest-cov ruff black
+            python -m compileall -q .
+            if [ -d tests ]; then python -m pytest --cov=. --cov-report=xml; fi
+            if [ -f pyproject.toml ] && grep -qE 'ruff|black' pyproject.toml; then python -m ruff check .; python -m ruff format --check .; fi
+          elif [ -f package.json ]; then [ -f package-lock.json ] && npm ci || npm install; npm run lint --if-present; npm test --if-present; npm run build --if-present
+          elif [ -f go.mod ]; then gofmt -l . | tee /tmp/gofmt.out; test ! -s /tmp/gofmt.out; go test ./...
+          elif [ -f Cargo.toml ]; then cargo fmt --all -- --check; cargo clippy --all-targets --all-features -- -D warnings; cargo test --all
+          elif [ -f pom.xml ]; then (./mvnw -B verify || mvn -B verify)
+          elif [ -f CMakeLists.txt ]; then cmake -S . -B build; cmake --build build --parallel; ctest --test-dir build --output-on-failure
+          else echo 'No supported build manifest detected.'; fi
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with: {name: coverage, path: coverage.xml, if-no-files-found: ignore}

.github/workflows/codeql.yml

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+name: CodeQL
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '23 3 * * 1'
+permissions:
+  contents: read
+  security-events: write
+jobs:
+  detect:
+    runs-on: ubuntu-latest
+    outputs:
+      languages: ${{ steps.lang.outputs.languages }}
+    steps:
+      - uses: actions/checkout@v4
+      - id: lang
+        shell: bash
+        run: |
+          set -euo pipefail
+          langs=''
+          [ -n "$(find . -name '*.py' -print -quit)" ] && langs="$langs python"
+          [ -n "$(find . -name '*.js' -print -quit)" ] || [ -n "$(find . -name '*.ts' -print -quit)" ] && langs="$langs javascript-typescript"
+          [ -f go.mod ] && langs="$langs go"
+          [ -f Cargo.toml ] && langs="$langs rust"
+          [ -f pom.xml ] || [ -f build.gradle ] && langs="$langs java-kotlin"
+          [ -n "$(find . -name '*.c' -print -quit)" ] || [ -n "$(find . -name '*.cpp' -print -quit)" ] && langs="$langs c-cpp"
+          [ -n "$langs" ] || langs=' python'
+          json="$(jq -cn --arg l "$langs" '$l | split(" ") | map(select(length > 0))')"
+          echo "languages=$json" >> "$GITHUB_OUTPUT"
+  analyze:
+    needs: detect
+    strategy:
+      fail-fast: false
+      matrix:
+        language: ${{ fromJSON(needs.detect.outputs.languages) }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: github/codeql-action/init@v3
+        with:
+          languages: ${{ matrix.language }}
+          build-mode: none
+
+      - uses: github/codeql-action/analyze@v3

.github/workflows/dependency-review.yml

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+name: Dependency Review
+on: {pull_request:}
+permissions: {contents: read, pull-requests: read}
+jobs:
+  review:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/dependency-review-action@v4
+        with: {fail-on-severity: high}

.github/workflows/security.yml

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+name: Security
+on:
+  push:
+  pull_request:
+  schedule: [{cron: '41 4 * * 1'}]
+permissions: {contents: read, security-events: write}
+jobs:
+  scan:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with: {fetch-depth: 0}
+      - uses: gitleaks/gitleaks-action@v2
+      - uses: aquasecurity/trivy-action@master
+        with: {scan-type: fs, scan-ref: ., format: sarif, output: trivy-results.sarif, ignore-unfixed: true, severity: 'HIGH,CRITICAL', exit-code: '1'}
+      - uses: github/codeql-action/upload-sarif@v3
+        if: always()
+        with: {sarif_file: trivy-results.sarif}