Add workflow, repository and dependency analysis

zizmor audits the workflows themselves for what makes a workflow
unsafe, and uploads what it finds to code scanning. Its first run here
found one thing, 4 times: a checkout that leaves the job's token in
the checked-out repository, where any later step can read it. No
workflow pushes or needs the token after the checkout, so every checkout
now sets persist-credentials to false, and zizmor reports nothing.

OpenSSF Scorecard grades how the repository is kept: branch protection,
pinned dependencies, token permissions and the like. It runs on the
default branch and weekly, publishes its score and uploads its findings to
code scanning.

Dependency Review fails a pull request that adds or changes a dependency
with a known vulnerability of high severity or worse. Dependabot watches
what is already there; this holds what comes in.

Every new action is pinned to a commit, each job names the permissions
it needs, and no new workflow has a default permission.

5 files changed, 132 insertions, 0 deletions

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f6db466..70631c6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,6 +21,8 @@ jobs:
     timeout-minutes: 15
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
       - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
           node-version: 24
@@ -50,6 +52,8 @@ jobs:
     timeout-minutes: 25
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
       - uses: actions/setup-java@de7274f081f381c8f8158605e0321c36c376e2e6 # v6.0.1
         with:
           distribution: temurin
@@ -119,4 +123,6 @@ jobs:
     timeout-minutes: 10
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
       - uses: actions/dependency-review-action@2031cfc080254a8a887f58cffee85186f0e49e48 # v4.9.0
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 0b29f44..c5dde81 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -29,6 +29,8 @@ jobs:
             build_mode: manual
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
       - uses: actions/setup-java@de7274f081f381c8f8158605e0321c36c376e2e6 # v6.0.1
         if: matrix.language == 'java-kotlin'
         with:
diff --git a/.github/workflows/dependency-review.yml b/.github/workflows/dependency-review.yml
new file mode 100644
index 0000000..de6e480
--- /dev/null
+++ b/.github/workflows/dependency-review.yml
@@ -0,0 +1,34 @@
+# SPDX-FileCopyrightText: 2026 Progmasoft <support@progmasoft.com>
+# SPDX-License-Identifier: AGPL-3.0-or-later WITH AdditionRef-Progmasoft-Patent-Grant-1.1
+
+name: Dependency Review
+
+# Looks at the dependencies a pull request adds or changes, and fails when
+# one of them has a known vulnerability of high severity or worse.
+# Dependabot watches what is already there; this holds what comes in.
+
+on:
+  pull_request:
+
+permissions: {}
+
+concurrency:
+  group: dependency-review-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  review:
+    name: Dependency review
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
+        with:
+          persist-credentials: false
+
+      - name: Review the dependency changes
+        uses: actions/dependency-review-action@a1d282b36b6f3519aa1f3fc636f609c47dddb294 # v5.0.0
+        with:
+          fail-on-severity: high
diff --git a/.github/workflows/scorecard.yml b/.github/workflows/scorecard.yml
new file mode 100644
index 0000000..82d07f9
--- /dev/null
+++ b/.github/workflows/scorecard.yml
@@ -0,0 +1,52 @@
+# SPDX-FileCopyrightText: 2026 Progmasoft <support@progmasoft.com>
+# SPDX-License-Identifier: AGPL-3.0-or-later WITH AdditionRef-Progmasoft-Patent-Grant-1.1
+
+name: Scorecard
+
+# OpenSSF Scorecard grades how the repository itself is kept: branch
+# protection, pinned dependencies, token permissions, and more. It reads the
+# default branch only. Its findings are uploaded to code scanning.
+
+on:
+  branch_protection_rule:
+  push:
+    branches:
+      - main
+  schedule:
+    - cron: '37 5 * * 2'
+
+permissions: {}
+
+jobs:
+  analysis:
+    name: Scorecard analysis
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    permissions:
+      actions: read
+      contents: read
+      id-token: write
+      security-events: write
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
+        with:
+          persist-credentials: false
+
+      - name: Run the analysis
+        uses: ossf/scorecard-action@2d1146689b8cda280b9bc96326124645441f03bc # v2.4.4
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          publish_results: true
+
+      - name: Keep the results
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: scorecard-results
+          path: results.sarif
+          retention-days: 5
+
+      - name: Upload to code scanning
+        uses: github/codeql-action/upload-sarif@7999b86c43a865dc79d8923397f35af22de63401 # v4
+        with:
+          sarif_file: results.sarif
diff --git a/.github/workflows/zizmor.yml b/.github/workflows/zizmor.yml
new file mode 100644
index 0000000..ee34012
--- /dev/null
+++ b/.github/workflows/zizmor.yml
@@ -0,0 +1,38 @@
+# SPDX-FileCopyrightText: 2026 Progmasoft <support@progmasoft.com>
+# SPDX-License-Identifier: AGPL-3.0-or-later WITH AdditionRef-Progmasoft-Patent-Grant-1.1
+
+name: Workflow Security
+
+# zizmor reads the workflows of this repository for what makes a workflow
+# unsafe: a token that is wider than its job needs, text from a pull request
+# that reaches a shell, an action that is not pinned. Its findings are
+# uploaded to code scanning.
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+permissions: {}
+
+concurrency:
+  group: zizmor-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  zizmor:
+    name: zizmor
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
+        with:
+          persist-credentials: false
+
+      - name: Audit the workflows
+        uses: zizmorcore/zizmor-action@cc914d7f3750a2d13d75c7f184a1060aa0e9d482 # v0.6.4