Dependabot hardening and workflow pipeline cleanup

.github/actions/setup-docker/action.yml

@@ -0,0 +1,23 @@
+name: "Set up Docker"
+description: >-
+  Set up QEMU + Docker Buildx and authenticate to Docker Hub for multi-arch
+  image builds. Centralizes the QEMU/Buildx/login trio used by release,
+  preview, and stable workflows.
+
+inputs:
+  dockerhub-username:
+    description: "Docker Hub username (pass from secrets)"
+    required: true
+  dockerhub-token:
+    description: "Docker Hub token/password (pass from secrets)"
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - uses: docker/setup-qemu-action@06116385d9baf250c9f4dcb4858b16962ea869c3 # v4.1.0
+    - uses: docker/setup-buildx-action@d7f5e7f509e45cec5c76c4d5afdd7de93d0b3df5 # v4.1.0
+    - uses: docker/login-action@650006c6eb7dba73a995cc03b0b2d7f5ca915bee # v4.2.0
+      with:
+        username: ${{ inputs.dockerhub-username }}
+        password: ${{ inputs.dockerhub-token }}

.github/actions/setup-hatch/action.yml

@@ -0,0 +1,13 @@
+name: "Set up Hatch build tooling"
+description: >-
+  Install the pinned hatch / hatchling / virtualenv toolchain used to build
+  and publish the package. Assumes Python is already set up by the caller.
+
+runs:
+  using: "composite"
+  steps:
+    - shell: bash
+      run: |
+        python -m pip install --upgrade pip
+        pip install "virtualenv<20.36"
+        pip install hatchling==1.27.0 hatch==1.14.0

.github/actions/setup-sfw/action.yml

@@ -0,0 +1,49 @@
+name: "Set up Socket Firewall"
+description: >-
+  Set up the requested language toolchain and install Socket Firewall (free
+  or enterprise edition) so subsequent steps can run package-manager commands
+  wrapped with `sfw`. Defaults to free/anonymous mode (no API token -- safe on
+  untrusted / Dependabot / fork PRs). Pass mode: firewall-enterprise +
+  socket-token for full org-policy enforcement on trusted maintainer PRs.
+
+inputs:
+  python:
+    description: "Set up Python 3.12"
+    default: "false"
+  node:
+    description: "Set up Node 20 (needed for npm-wrapped checks)"
+    default: "false"
+  uv:
+    description: "Install uv (implies Python)"
+    default: "false"
+  mode:
+    description: "socketdev/action mode: firewall-free or firewall-enterprise"
+    default: "firewall-free"
+  socket-token:
+    description: "Socket API token (only used/required for firewall-enterprise)"
+    default: ""
+
+runs:
+  using: "composite"
+  steps:
+    - if: ${{ inputs.python == 'true' || inputs.uv == 'true' }}
+      uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+      with:
+        python-version: "3.12"
+
+    - if: ${{ inputs.node == 'true' }}
+      uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
+      with:
+        node-version: "20"
+
+    # Official Socket setup action. Wires up sfw routing correctly.
+    # socket-token is ignored in firewall-free mode and empty when absent.
+    - uses: socketdev/action@ba6de6cc0565af1f42295590380973573297e31f # v1.3.2
+      with:
+        mode: ${{ inputs.mode }}
+        socket-token: ${{ inputs.socket-token }}
+
+    - if: ${{ inputs.uv == 'true' }}
+      name: Install uv
+      shell: bash
+      run: python -m pip install --upgrade pip uv

.github/dependabot.yml

@@ -36,9 +36,11 @@ updates:
     cooldown:
       default-days: 7
 
-  # GitHub Actions used in workflows
+  # GitHub Actions used in workflows and local composite actions.
   - package-ecosystem: "github-actions"
-    directory: "/"
+    directories:
+      - "/"
+      - "/.github/actions/*"
     schedule:
       interval: "weekly"
     open-pull-requests-limit: 2