Add GitHub CI security and release workflows

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: cargo
+    directory: /
+    schedule:
+      interval: weekly
+      day: monday
+      time: "05:00"
+    open-pull-requests-limit: 5
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+      day: monday
+      time: "05:30"
+    open-pull-requests-limit: 5

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_dispatch:
+
+concurrency:
+  group: ci-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+env:
+  CARGO_TERM_COLOR: always
+  RUST_BACKTRACE: 1
+
+jobs:
+  fmt-clippy-docs:
+    name: fmt, clippy, docs
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+
+      - name: Cache Cargo
+        uses: Swatinem/rust-cache@v2
+
+      - name: Check formatting
+        run: cargo fmt --all -- --check
+
+      - name: Run clippy
+        run: cargo clippy --workspace --all-targets -- -D warnings
+
+      - name: Build docs
+        run: cargo doc --workspace --no-deps
+
+  test:
+    name: test (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    env:
+      GETH_TEST_SKIP_IROH: 1
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache Cargo
+        uses: Swatinem/rust-cache@v2
+
+      - name: Check workspace
+        run: cargo check --workspace --all-targets
+
+      - name: Test workspace without live Iroh integration
+        run: cargo test --workspace
+
+  iroh-integration:
+    name: iroh integration smoke tests
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache Cargo
+        uses: Swatinem/rust-cache@v2
+
+      - name: Run Iroh-heavy CLI integration tests serially
+        run: cargo test -p geth --test bootstrap -- --test-threads=1
+
+      - name: Run Iroh-heavy node integration tests
+        run: |
+          cargo test -p geth-node peer_ping_uses_signed_peer_card_over_iroh -- --nocapture
+          cargo test -p geth-node overlay_packets_route_over_dedicated_iroh_alpn_with_authorization -- --nocapture

.github/workflows/codeql.yml

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+name: CodeQL
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  schedule:
+    - cron: "43 3 * * 2"
+  workflow_dispatch:
+
+concurrency:
+  group: codeql-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  actions: read
+  contents: read
+  security-events: write
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  analyze:
+    name: Analyze Rust
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v3
+        with:
+          languages: rust
+          build-mode: manual
+
+      - name: Build workspace for CodeQL
+        run: cargo build --workspace --all-targets
+
+      - name: Perform CodeQL analysis
+        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:
+  dependency-review:
+    name: Dependency Review
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Review dependency changes
+        uses: actions/dependency-review-action@v4
+        with:
+          fail-on-severity: moderate

.github/workflows/release.yml

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+name: Release
+
+on:
+  push:
+    tags:
+      - "v*"
+  workflow_dispatch:
+    inputs:
+      prerelease:
+        description: "Mark the GitHub release as a prerelease"
+        required: false
+        default: "true"
+        type: choice
+        options: ["true", "false"]
+
+permissions:
+  contents: write
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+    name: build ${{ matrix.target }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-latest
+            target: linux-x86_64
+            binary: geth
+          - os: macos-latest
+            target: macos
+            binary: geth
+          - os: windows-latest
+            target: windows-x86_64
+            binary: geth.exe
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache Cargo
+        uses: Swatinem/rust-cache@v2
+
+      - name: Build release binary
+        run: cargo build --release -p geth
+
+      - name: Package Unix artifact
+        if: runner.os != 'Windows'
+        shell: bash
+        run: |
+          set -euo pipefail
+          version="${GITHUB_REF_NAME:-manual}"
+          pkg="geth-${version}-${{ matrix.target }}"
+          mkdir -p "${pkg}" dist
+          cp "target/release/${{ matrix.binary }}" "${pkg}/"
+          cp README.md "${pkg}/"
+          tar -czf "dist/${pkg}.tar.gz" "${pkg}"
+
+      - name: Package Windows artifact
+        if: runner.os == 'Windows'
+        shell: pwsh
+        run: |
+          $version = if ($env:GITHUB_REF_NAME) { $env:GITHUB_REF_NAME } else { "manual" }
+          $pkg = "geth-$version-${{ matrix.target }}"
+          New-Item -ItemType Directory -Force -Path $pkg, dist | Out-Null
+          Copy-Item "target/release/${{ matrix.binary }}" "$pkg/"
+          Copy-Item README.md "$pkg/"
+          Compress-Archive -Path "$pkg/*" -DestinationPath "dist/$pkg.zip" -Force
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: geth-${{ matrix.target }}
+          path: dist/*
+          if-no-files-found: error
+
+  github-release:
+    name: publish GitHub release
+    runs-on: ubuntu-latest
+    needs: build
+    if: startsWith(github.ref, 'refs/tags/') || github.event_name == 'workflow_dispatch'
+    steps:
+      - name: Download artifacts
+        uses: actions/download-artifact@v4
+        with:
+          path: dist
+          merge-multiple: true
+
+      - name: Publish release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: dist/*
+          prerelease: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.prerelease == 'true' }}
+          generate_release_notes: true

.github/workflows/security.yml

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+name: Security
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  schedule:
+    - cron: "17 4 * * 1"
+  workflow_dispatch:
+
+concurrency:
+  group: security-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  cargo-audit:
+    name: RustSec cargo-audit
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache Cargo
+        uses: Swatinem/rust-cache@v2
+
+      - name: Install cargo-audit
+        uses: taiki-e/install-action@cargo-audit
+
+      - name: Scan Cargo.lock for advisories
+        run: cargo audit --deny warnings