diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 3e1a95a..2db3a50 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -1,17 +1,23 @@
 {
     "name": "template-python",
-    // https://mcr.microsoft.com/en-us/product/devcontainers/python/tags
-    "image": "mcr.microsoft.com/devcontainers/python:dev-3.13-bookworm",
+    // https://mcr.microsoft.com/en-us/artifact/mar/devcontainers/python/tags
+    "image": "mcr.microsoft.com/devcontainers/python:3-3.14-trixie",
+    "features": {
+        // Run `make ci-test-docker` and other Docker-based checks against the host daemon.
+        "ghcr.io/devcontainers/features/docker-outside-of-docker:1": {}
+    },
     "customizations": {
         "vscode": {
             "extensions": [
                 "charliermarsh.ruff",
-                "GitHub.copilot-chat",
+                "editorconfig.editorconfig",
+                "github.vscode-github-actions",
                 "ms-python.mypy-type-checker",
                 "ms-python.python"
             ]
         }
     },
-    "postCreateCommand": "pipx install uv==0.12.19 && make install-deps-dev",
+    // Keep the uv version within [tool.uv] required-version in pyproject.toml.
+    "postCreateCommand": "pipx install uv==0.13.7 && make install-deps-dev && make install-hooks",
     "remoteUser": "vscode"
 }
diff --git a/.dockerignore b/.dockerignore
index e2d4424..3fa44b9 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,19 +1,9 @@
-.git
-.github
-.venv
-.coverage
-.pytest_cache
-.ruff_cache
-.mypy_cache
-dist
-site
-notebooks
-tests
-docs
-.devcontainer
-.vscode
-*.egg-info
-__pycache__
-*.py[cod]
-.env
-.env.*
+# Allowlist: only files needed to build the image enter the build context.
+*
+!pyproject.toml
+!uv.lock
+!README.md
+!LICENSE
+!src/
+**/__pycache__
+**/*.py[cod]
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..9b7b80c
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,18 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{toml,yaml,yml}]
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
+
+[Makefile]
+indent_style = tab
diff --git a/.env.template b/.env.template
index 26d749b..4761817 100644
--- a/.env.template
+++ b/.env.template
@@ -5,3 +5,5 @@
 # Project Settings
 PROJECT_NAME=template-python
 PROJECT_LOG_LEVEL=INFO
+# text or json
+PROJECT_LOG_FORMAT=text
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..03c52fd
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,3 @@
+* text=auto eol=lf
+*.png binary
+uv.lock linguist-generated=true
diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 0000000..ce6c125
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1,2 @@
+# Default reviewers for every change. Replace with your team when adopting the template.
+* @ks6088ts
diff --git a/.github/ISSUE_TEMPLATE/bug_report.yml b/.github/ISSUE_TEMPLATE/bug_report.yml
new file mode 100644
index 0000000..7019f56
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/bug_report.yml
@@ -0,0 +1,29 @@
+name: Bug report
+description: Report unexpected behavior
+labels: ["bug"]
+body:
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+      description: Include the exact command and the first error message.
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: What did you expect?
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      description: Output of `template-python --version` or the commit SHA.
+    validations:
+      required: true
+  - type: input
+    id: environment
+    attributes:
+      label: Environment
+      description: OS, Python version, and uv version.
diff --git a/.github/ISSUE_TEMPLATE/config.yml b/.github/ISSUE_TEMPLATE/config.yml
new file mode 100644
index 0000000..004da4a
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/config.yml
@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Report a security vulnerability
+    url: https://github.com/ks6088ts/template-python/security/advisories/new
+    about: Please report vulnerabilities privately.
diff --git a/.github/ISSUE_TEMPLATE/feature_request.yml b/.github/ISSUE_TEMPLATE/feature_request.yml
new file mode 100644
index 0000000..80b5e76
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/feature_request.yml
@@ -0,0 +1,18 @@
+name: Feature request
+description: Propose a change or improvement
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What concrete problem would this solve?
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposal
+      description: The simplest change that solves the problem, and alternatives considered.
+    validations:
+      required: true
diff --git a/.github/dependabot.yaml b/.github/dependabot.yaml
index 8216109..3f4ebda 100644
--- a/.github/dependabot.yaml
+++ b/.github/dependabot.yaml
@@ -1,22 +1,48 @@
-# https://docs.github.com/en/code-security/dependabot/ecosystems-supported-by-dependabot/supported-ecosystems-and-repositories#supported-ecosystems-and-repositories
+# https://docs.github.com/en/code-security/dependabot/working-with-dependabot/dependabot-options-reference
+# A cooldown delays adoption of freshly published releases to reduce supply-chain risk.
 version: 2
 updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
       interval: "weekly"
+    cooldown:
+      default-days: 7
+    groups:
+      github-actions:
+        patterns: ["*"]
   - package-ecosystem: "uv"
     directory: "/"
     schedule:
       interval: "weekly"
-    # https://docs.github.com/ja/code-security/dependabot/dependabot-version-updates/optimizing-pr-creation-version-updates#setting-up-a-cooldown-period-for-dependency-updates
     cooldown:
-      default-days: 5
+      default-days: 7
+      semver-major-days: 14
+    groups:
+      python-dev:
+        dependency-type: "development"
+        update-types: ["minor", "patch"]
+      python-runtime:
+        dependency-type: "production"
+        update-types: ["minor", "patch"]
   - package-ecosystem: "pre-commit"
     directory: "/"
     schedule:
       interval: "weekly"
+    cooldown:
+      default-days: 7
+    groups:
+      pre-commit:
+        patterns: ["*"]
   - package-ecosystem: "docker"
     directory: "/"
     schedule:
       interval: "weekly"
+    cooldown:
+      default-days: 7
+  - package-ecosystem: "devcontainers"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    cooldown:
+      default-days: 7
diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
new file mode 100644
index 0000000..80320ff
--- /dev/null
+++ b/.github/pull_request_template.md
@@ -0,0 +1,13 @@
+## Summary
+
+<!-- What changes and why. Link related issues, e.g. "Closes #123". -->
+
+## Verification
+
+<!-- Commands run and their results, e.g. `make ci-test`. -->
+
+## Checklist
+
+- [ ] Checks for the changed area pass ([checks by change type](../docs/development.md#checks-by-change-type))
+- [ ] English and Japanese documentation are updated if behavior changed
+- [ ] No secrets, credentials, or private configuration are included
diff --git a/.github/workflows/azure-static-web-app.yaml b/.github/workflows/azure-static-web-app.yaml
index 9869cc9..12a3421 100644
--- a/.github/workflows/azure-static-web-app.yaml
+++ b/.github/workflows/azure-static-web-app.yaml
@@ -10,24 +10,21 @@ permissions:
 jobs:
   deploy:
     runs-on: ubuntu-latest
-    timeout-minutes: 5
+    timeout-minutes: 10
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
-      - name: Set up uv with caching enabled
-        uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
+      # No cache in publishing workflows to avoid cache poisoning.
+      - name: Set up uv
+        uses: astral-sh/setup-uv@68559e99cc807c1eb7e9238fd43a15bba460eec2 # v10.3.3
         with:
-          enable-cache: true
-          version: "0.12.19"
-          python-version: "3.13"
-      - name: Generate documentation
-        shell: bash
-        run: |
-          make install-deps-docs
-          make docs
+          enable-cache: false
+      - name: Build documentation
+        run: make ci-test-docs
+      # Upstream has both a v1 tag (pinned here) and a v1 branch, which zizmor reports as ambiguous.
       - name: Deploy
-        uses: Azure/static-web-apps-deploy@1a947af9992250f3bc2e68ad0754c0b0c11566c9 # v1
+        uses: Azure/static-web-apps-deploy@1a947af9992250f3bc2e68ad0754c0b0c11566c9 # v1 # zizmor: ignore[ref-version-mismatch]
         with:
           azure_static_web_apps_api_token: ${{ secrets.AZURE_STATIC_WEB_APPS_API_TOKEN }}
           action: "upload"
diff --git a/.github/workflows/codeql.yaml b/.github/workflows/codeql.yaml
new file mode 100644
index 0000000..150f9d9
--- /dev/null
+++ b/.github/workflows/codeql.yaml
@@ -0,0 +1,45 @@
+name: codeql
+
+on:
+  push:
+    branches:
+      - "main"
+  pull_request:
+    branches:
+      - "main"
+  schedule:
+    - cron: "23 4 * * 1"
+permissions:
+  contents: read
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  analyze:
+    name: analyze (${{ matrix.language }})
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+    strategy:
+      fail-fast: false
+      matrix:
+        language:
+          - actions
+          - python
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@33d7b85da1a04171e211befe2c739303b9a4c066 # v4.39.3
+        with:
+          languages: ${{ matrix.language }}
+          build-mode: none
+          queries: security-extended
+      - name: Perform CodeQL analysis
+        uses: github/codeql-action/analyze@33d7b85da1a04171e211befe2c739303b9a4c066 # v4.39.3
+        with:
+          category: "/language:${{ matrix.language }}"
diff --git a/.github/workflows/docker-release.yaml b/.github/workflows/docker-release.yaml
deleted file mode 100644
index a1f5590..0000000
--- a/.github/workflows/docker-release.yaml
+++ /dev/null
@@ -1,48 +0,0 @@
-name: docker-release
-on:
-  push:
-    tags:
-      - "v*"
-permissions:
-  contents: read
-jobs:
-  release:
-    runs-on: "ubuntu-latest"
-    timeout-minutes: 10
-    steps:
-      - name: Check out the repo
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@f87e5991a6d7451dcb8d9637bfbc97413f497069 # v4.4.1
-      - name: Log in to Docker Hub
-        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-      # https://github.com/docker/build-push-action/issues/42#issuecomment-915323168
-      - name: Set Versions
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
-        id: set_version
-        with:
-          script: |
-            const tag = context.ref.substring(10)
-            const no_v = tag.replace('v', '')
-            const dash_index = no_v.lastIndexOf('-')
-            const no_dash = (dash_index > -1) ?  no_v.substring(0, dash_index) : no_v
-            core.setOutput('tag', tag)
-            core.setOutput('no-v', no_v)
-            core.setOutput('no-dash', no_dash)
-      - name: Build and push tag ${{steps.set_version.outputs.no-dash}}
-        uses: docker/build-push-action@c3c9e263c25d99ce0380d002d59b67737d91b0dc # v7.4.0
-        with:
-          context: .
-          platforms: linux/amd64,linux/arm64
-          push: true
-          build-args: |
-            GIT_REVISION=${{ github.sha }}
-            GIT_TAG=${{steps.set_version.outputs.no-dash}}
-          tags: |
-            ${{ secrets.DOCKERHUB_USERNAME }}/template-python:${{steps.set_version.outputs.no-dash}}
-            ${{ secrets.DOCKERHUB_USERNAME }}/template-python:latest
diff --git a/.github/workflows/docker.yaml b/.github/workflows/docker.yaml
index 17ee4be..e5337b2 100644
--- a/.github/workflows/docker.yaml
+++ b/.github/workflows/docker.yaml
@@ -10,16 +10,17 @@ on:
       - "main"
 permissions:
   contents: read
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 jobs:
   docker:
     runs-on: "ubuntu-latest"
-    timeout-minutes: 5
+    timeout-minutes: 10
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           fetch-depth: 0 # to retrieve git tags
           persist-credentials: false
-      - name: Run CI tests for Docker
-        shell: bash
-        run: |
-          make ci-test-docker
+      - name: Lint, build, scan, and run the image
+        run: make ci-test-docker
diff --git a/.github/workflows/ghcr-release.yaml b/.github/workflows/ghcr-release.yaml
deleted file mode 100644
index 5ec4c77..0000000
--- a/.github/workflows/ghcr-release.yaml
+++ /dev/null
@@ -1,52 +0,0 @@
-name: ghcr
-on:
-  push:
-    tags:
-      - "v*"
-permissions:
-  packages: write
-  contents: read
-env:
-  IMAGE_NAME: template-python
-jobs:
-  ghcr:
-    runs-on: ubuntu-latest
-    timeout-minutes: 10
-    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          persist-credentials: false
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@f87e5991a6d7451dcb8d9637bfbc97413f497069 # v4.4.1
-      - uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
-        with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-      - name: Set Versions
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
-        id: set_version
-        with:
-          script: |
-            const tag = context.ref.substring(10)
-            const no_v = tag.replace('v', '')
-            const dash_index = no_v.lastIndexOf('-')
-            const no_dash = (dash_index > -1) ?  no_v.substring(0, dash_index) : no_v
-            core.setOutput('tag', tag)
-            core.setOutput('no-v', no_v)
-            core.setOutput('no-dash', no_dash)
-      - name: Set meta data tag = ${{steps.set_version.outputs.no-dash}}
-        uses: docker/metadata-action@dc802804100637a589fabce1cb79ff13a1411302 # v6.2.0
-        id: meta
-        with:
-          images: ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}
-          tags: |
-            type=semver,pattern={{version}},value=v${{steps.set_version.outputs.no-dash}}
-            type=raw,value=latest
-      - uses: docker/build-push-action@c3c9e263c25d99ce0380d002d59b67737d91b0dc # v7.4.0
-        with:
-          push: true
-          context: .
-          platforms: linux/amd64,linux/arm64
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
diff --git a/.github/workflows/github-pages.yaml b/.github/workflows/github-pages.yaml
index c1b892e..405dca1 100644
--- a/.github/workflows/github-pages.yaml
+++ b/.github/workflows/github-pages.yaml
@@ -4,11 +4,9 @@ on:
   push:
     branches:
       - main
+  workflow_dispatch:
 
-permissions:
-  contents: read
-  id-token: write
-  pages: write
+permissions: {}
 
 concurrency:
   group: pages
@@ -21,16 +19,19 @@ jobs:
       url: ${{ steps.deployment.outputs.page_url }}
     runs-on: ubuntu-latest
     timeout-minutes: 10
+    permissions:
+      contents: read
+      id-token: write
+      pages: write
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
+      # No cache in publishing workflows to avoid cache poisoning.
       - name: Set up uv
-        uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
+        uses: astral-sh/setup-uv@68559e99cc807c1eb7e9238fd43a15bba460eec2 # v10.3.3
         with:
-          enable-cache: true
-          version: "0.12.19"
-          python-version: "3.13"
+          enable-cache: false
       - name: Build documentation
         run: make ci-test-docs
       - name: Upload Pages artifact
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
new file mode 100644
index 0000000..de373d4
--- /dev/null
+++ b/.github/workflows/release.yaml
@@ -0,0 +1,90 @@
+name: release
+
+on:
+  push:
+    tags:
+      - "v*"
+permissions: {}
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: false
+jobs:
+  verify:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - name: Verify that the tag matches the package version
+        shell: bash
+        run: |
+          version=$(python3 -c 'import tomllib; print(tomllib.load(open("pyproject.toml", "rb"))["project"]["version"])')
+          if [ "v${version}" != "${GITHUB_REF_NAME}" ]; then
+            echo "::error::Tag ${GITHUB_REF_NAME} does not match pyproject.toml version ${version} (expected v${version})"
+            exit 1
+          fi
+  ghcr:
+    needs: verify
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    permissions:
+      attestations: write
+      contents: read
+      id-token: write
+      packages: write
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@99012661954931238ded8c8b007157a8430204e1 # v4.4.0
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@f87e5991a6d7451dcb8d9637bfbc97413f497069 # v4.4.1
+      # PEP 440 tags: pre-releases (e.g. v1.0.0rc1) get only their exact tag, never latest or major.minor.
+      - name: Generate image metadata
+        id: meta
+        uses: docker/metadata-action@dc802804100637a589fabce1cb79ff13a1411302 # v6.2.0
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=pep440,pattern={{version}}
+            type=pep440,pattern={{major}}.{{minor}}
+      - name: Build image for scanning
+        uses: docker/build-push-action@c3c9e263c25d99ce0380d002d59b67737d91b0dc # v7.4.0
+        with:
+          context: .
+          load: true
+          platforms: linux/amd64
+          tags: release-scan/template-python:candidate
+      - name: Scan image
+        run: make docker-scan DOCKER_REPO_NAME=release-scan DOCKER_IMAGE_NAME=template-python GIT_TAG=candidate
+      - name: Log in to GHCR
+        uses: docker/login-action@8aa5831fb8d48d8f76594c7ddde61ae58019f550 # v4.8.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push
+        id: push
+        uses: docker/build-push-action@c3c9e263c25d99ce0380d002d59b67737d91b0dc # v7.4.0
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          provenance: mode=max
+          sbom: true
+          build-args: |
+            GIT_REVISION=${{ github.sha }}
+            GIT_TAG=${{ steps.meta.outputs.version }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          annotations: ${{ steps.meta.outputs.annotations }}
+      - name: Attest build provenance
+        uses: actions/attest-build-provenance@4d101475d8b20a2381f78447822ac1eab6504dd8 # v4.2.2
+        with:
+          subject-name: ghcr.io/${{ github.repository }}
+          subject-digest: ${{ steps.push.outputs.digest }}
+          push-to-registry: true
diff --git a/.github/workflows/scorecard.yaml b/.github/workflows/scorecard.yaml
new file mode 100644
index 0000000..1b1ebd6
--- /dev/null
+++ b/.github/workflows/scorecard.yaml
@@ -0,0 +1,39 @@
+name: scorecard
+
+on:
+  branch_protection_rule:
+  push:
+    branches:
+      - "main"
+  schedule:
+    - cron: "41 5 * * 1"
+permissions: {}
+jobs:
+  analysis:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    permissions:
+      actions: read
+      contents: read
+      id-token: write # publish results to the OpenSSF API
+      security-events: write # upload SARIF to code scanning
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - name: Run OpenSSF Scorecard
+        uses: ossf/scorecard-action@fa7117db83c52d787ae5a89f350999701505d78e # v2.5.0
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          publish_results: true
+      - name: Upload SARIF artifact
+        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: scorecard-sarif
+          path: results.sarif
+          retention-days: 5
+      - name: Upload SARIF to code scanning
+        uses: github/codeql-action/upload-sarif@33d7b85da1a04171e211befe2c739303b9a4c066 # v4.39.3
+        with:
+          sarif_file: results.sarif
diff --git a/.github/workflows/security.yaml b/.github/workflows/security.yaml
new file mode 100644
index 0000000..c3c96bf
--- /dev/null
+++ b/.github/workflows/security.yaml
@@ -0,0 +1,33 @@
+name: security
+
+on:
+  push:
+    branches:
+      - "main"
+  pull_request:
+    branches:
+      - "main"
+  schedule:
+    # Weekly, so newly disclosed vulnerabilities are found without code changes.
+    - cron: "17 3 * * 1"
+  workflow_dispatch:
+permissions:
+  contents: read
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  scan:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          fetch-depth: 0 # scan the full Git history for secrets
+          persist-credentials: false
+      - name: Set up uv
+        uses: astral-sh/setup-uv@68559e99cc807c1eb7e9238fd43a15bba460eec2 # v10.3.3
+        with:
+          enable-cache: true
+      - name: Audit dependencies, secrets, and files
+        run: make ci-test-security
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 2f9a1d3..a62574e 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -15,68 +15,69 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 jobs:
-  test:
+  quality:
+    name: quality gate
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      # uv version comes from [tool.uv] required-version; Python from .python-version.
+      - name: Set up uv
+        uses: astral-sh/setup-uv@68559e99cc807c1eb7e9238fd43a15bba460eec2 # v10.3.3
+        with:
+          enable-cache: true
+      - name: Run Python quality gate
+        run: make ci-test
+      - name: Build documentation
+        run: make ci-test-docs
+  compatibility:
+    name: python ${{ matrix.python-version }}
     strategy:
       fail-fast: false
       matrix:
         python-version:
           - "3.12"
           - "3.13"
-          - "3.14"
+          - "3.15"
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
-      - name: Set up uv with caching enabled
-        uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
+      - name: Set up uv
+        uses: astral-sh/setup-uv@68559e99cc807c1eb7e9238fd43a15bba460eec2 # v10.3.3
         with:
           enable-cache: true
-          version: "0.12.19"
           python-version: ${{ matrix.python-version }}
-      - name: Install actionlint
-        if: matrix.python-version == '3.13'
-        shell: bash
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          mkdir -p "$RUNNER_TEMP/actionlint"
-          gh release download v1.7.12 --repo rhysd/actionlint \
-            --pattern 'actionlint_1.7.12_linux_amd64.tar.gz' \
-            --pattern 'actionlint_1.7.12_checksums.txt' \
-            --dir "$RUNNER_TEMP/actionlint"
-          (cd "$RUNNER_TEMP/actionlint" && sha256sum -c --ignore-missing actionlint_1.7.12_checksums.txt)
-          tar -xzf "$RUNNER_TEMP/actionlint/actionlint_1.7.12_linux_amd64.tar.gz" -C "$RUNNER_TEMP/actionlint" actionlint
-          echo "$RUNNER_TEMP/actionlint" >> "$GITHUB_PATH"
-      - name: Run CI tests
-        if: matrix.python-version == '3.13'
-        shell: bash
-        run: |
-          make ci-test
-          make ci-test-docs
-      - name: Run Python compatibility tests
-        if: matrix.python-version != '3.13'
-        shell: bash
-        run: |
-          uv sync --locked --no-dev --group test
-          uv run --locked --no-dev --group test pytest
-  hooks:
+      - name: Run tests
+        run: uv run --locked --no-dev --group test pytest
+  lowest:
+    name: lowest dependencies
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
-      - name: Set up uv with caching enabled
-        uses: astral-sh/setup-uv@07a047e608db84b3d8c06cd9a7c7dcc9c355c18e # v10.3.2
+      - name: Set up uv
+        uses: astral-sh/setup-uv@68559e99cc807c1eb7e9238fd43a15bba460eec2 # v10.3.3
         with:
           enable-cache: true
-          version: "0.12.19"
-          python-version: "3.13"
-      - name: Set up Python 3.13
-        uses: actions/setup-python@6d4fd22b20465ccc0f7354476588e8df7c9ca0e0 # v7.1.0
+      - name: Run tests with lowest direct dependencies
+        run: make test-lowest
+  hooks:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
-          python-version: "3.13"
+          persist-credentials: false
+      - name: Set up uv
+        uses: astral-sh/setup-uv@68559e99cc807c1eb7e9238fd43a15bba460eec2 # v10.3.3
+        with:
+          enable-cache: true
       - name: Run configured hooks
         run: make hooks-check
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index e7968c7..eedad3a 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,16 +1,56 @@
+# Python tools run from uv.lock so hooks, Make targets, and CI use identical versions.
+# Repository hooks below are updated by Dependabot (pre-commit ecosystem).
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v6.0.0
     hooks:
+      - id: check-added-large-files
+      - id: check-case-conflict
+      - id: check-merge-conflict
+      - id: check-toml
       - id: check-yaml
+      - id: detect-private-key
       - id: end-of-file-fixer
+      - id: mixed-line-ending
+        args: [--fix=lf]
       - id: trailing-whitespace
-  - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.17.2
+  - repo: https://github.com/gitleaks/gitleaks
+    rev: v8.30.1
     hooks:
+      - id: gitleaks
+  - repo: local
+    hooks:
+      - id: uv-lock
+        name: uv lock --check
+        entry: uv lock --check
+        language: system
+        files: ^(pyproject\.toml|uv\.lock)$
+        pass_filenames: false
       - id: ruff-check
-        types_or: [python, pyi]
-        args: [--fix]
+        name: ruff check
+        entry: uv run --locked ruff check --fix --force-exclude
+        language: system
+        types_or: [python, pyi, jupyter]
       - id: ruff-format
+        name: ruff format
+        entry: uv run --locked ruff format --force-exclude
+        language: system
+        types_or: [python, pyi, jupyter]
+      - id: mypy
+        name: mypy
+        entry: uv run --locked mypy
+        language: system
         types_or: [python, pyi]
-exclude: "generated/.*|artifacts/.*"
+        pass_filenames: false
+      - id: actionlint
+        name: actionlint
+        entry: uv run --locked actionlint
+        language: system
+        files: ^\.github/workflows/.+\.ya?ml$
+      - id: zizmor
+        name: zizmor
+        entry: uv run --locked zizmor --offline --min-severity low .
+        language: system
+        files: ^\.github/
+        pass_filenames: false
+exclude: ^(site|dist|build)/
diff --git a/.python-version b/.python-version
new file mode 100644
index 0000000..6324d40
--- /dev/null
+++ b/.python-version
@@ -0,0 +1 @@
+3.14
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
index 20ccbd0..4d87bc2 100644
--- a/.vscode/extensions.json
+++ b/.vscode/extensions.json
@@ -1,7 +1,9 @@
 {
-  "recommendations": [
-    "charliermarsh.ruff",
-    "ms-python.mypy-type-checker",
-    "ms-python.python"
-  ]
+    "recommendations": [
+        "charliermarsh.ruff",
+        "editorconfig.editorconfig",
+        "github.vscode-github-actions",
+        "ms-python.mypy-type-checker",
+        "ms-python.python"
+    ]
 }
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..f79d3a8
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,13 @@
+# Contributing
+
+Thank you for improving this project. The documentation is the single source of truth for
+procedures; this page only links to it.
+
+1. Set up the environment with the [development guide](docs/development.md#set-up-once).
+2. Decide where a change belongs with the
+   [engineering guide](docs/architecture/README.md#where-to-change-code).
+3. Run the [checks for the changed area](docs/development.md#checks-by-change-type).
+4. Update the English and Japanese documentation together when behavior changes.
+5. Open a pull request using the template and describe the verification you performed.
+
+Report security issues privately as described in [SECURITY.md](SECURITY.md).
diff --git a/Dockerfile b/Dockerfile
index 82c20e6..704e75d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,37 +1,54 @@
-FROM python:3.13-slim-trixie AS build
+# syntax=docker/dockerfile:1
 
-WORKDIR /build
+# Build a virtual environment from uv.lock; hashes in the lock file are verified.
+FROM python:3.14-slim-trixie@sha256:9aaa474097d094040649f2162a627c0049b408f52138d980916788d80f04802f AS build
+
+COPY --from=astral/uv:0.13.7@sha256:96f40d3904aad8d0bd010539001d36c8e2188b981e1334471a90c4a1d93bb490 /uv /usr/local/bin/uv
+
+ENV UV_COMPILE_BYTECODE=1 \
+    UV_LINK_MODE=copy \
+    UV_PYTHON_DOWNLOADS=never \
+    UV_PROJECT_ENVIRONMENT=/app/.venv
+
+WORKDIR /src
+
+# Install dependencies first so this layer is reused until the lock file changes.
+RUN --mount=type=cache,target=/root/.cache/uv \
+    --mount=type=bind,source=uv.lock,target=uv.lock \
+    --mount=type=bind,source=pyproject.toml,target=pyproject.toml \
+    uv sync --locked --no-dev --no-install-project
 
-COPY --from=astral/uv:0.12.19 /uv /usr/local/bin/uv
 COPY pyproject.toml uv.lock README.md LICENSE ./
 COPY src ./src
+RUN --mount=type=cache,target=/root/.cache/uv \
+    uv sync --locked --no-dev --no-editable
 
-RUN uv export \
-    --locked \
-    --no-dev \
-    --no-emit-project \
-    --no-hashes \
-    --output-file /dist/requirements.txt \
-    && uv build --wheel --out-dir /dist
-
-FROM python:3.13-slim-trixie
+FROM python:3.14-slim-trixie@sha256:9aaa474097d094040649f2162a627c0049b408f52138d980916788d80f04802f
 
 ARG GIT_REVISION="0000000"
 ARG GIT_TAG="0.0.0"
 
-LABEL org.opencontainers.image.source="https://github.com/ks6088ts/template-python" \
+LABEL org.opencontainers.image.title="template-python" \
+      org.opencontainers.image.description="A minimal, typed Python CLI template" \
+      org.opencontainers.image.licenses="MIT" \
+      org.opencontainers.image.source="https://github.com/ks6088ts/template-python" \
       org.opencontainers.image.revision="${GIT_REVISION}" \
       org.opencontainers.image.version="${GIT_TAG}"
 
-RUN groupadd --system --gid 10001 app \
-    && useradd --system --uid 10001 --gid 10001 --home-dir /app app
+# Apply Debian security fixes published after the base image was built, and remove pip
+# (and its vendored libraries) because the runtime never installs packages.
+RUN apt-get update \
+    && apt-get upgrade --yes --no-install-recommends \
+    && rm -rf /var/lib/apt/lists/* \
+    && python -m pip uninstall --yes --root-user-action=ignore pip \
+    && groupadd --system --gid 10001 app \
+    && useradd --system --uid 10001 --gid 10001 --no-create-home --home-dir /app app
+
+COPY --from=build --chown=root:root /app/.venv /app/.venv
 
-COPY --from=build /dist/requirements.txt /tmp/requirements.txt
-COPY --from=build /dist/*.whl /tmp/
-RUN pip install --no-cache-dir --requirement /tmp/requirements.txt \
-    && pip install --no-cache-dir --no-deps /tmp/*.whl \
-    && pip uninstall --yes pip \
-    && rm /tmp/*.whl /tmp/requirements.txt
+ENV PATH="/app/.venv/bin:${PATH}" \
+    PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1
 
 USER 10001:10001
 WORKDIR /app
diff --git a/Makefile b/Makefile
index 5844f40..fb43f69 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,20 @@
+SHELL := bash
+.SHELLFLAGS := -eu -o pipefail -c
+
 # Git
 GIT_REVISION ?= $(shell git rev-parse --short HEAD)
-GIT_TAG ?= $(shell git describe --tags --abbrev=0 --always | sed -e s/v//g)
+GIT_TAG ?= $(shell git describe --tags --abbrev=0 --always | sed -e 's/^v//')
+
+# Container images used as tools. Pin by digest; refresh with
+# `docker buildx imagetools inspect <image>:<tag>`.
+HADOLINT_IMAGE ?= hadolint/hadolint:v2.15.1@sha256:32dac94127fd60b7b7e3fbfc65e1383b9b5e25c9bfd7b8536de7a539fe68a12d
+TRIVY_IMAGE ?= aquasec/trivy:0.76.1@sha256:790fd66d1697395d8693d1acaa1ea702406a20f109b6fc7bac8db623eca6c06c
+GITLEAKS_IMAGE ?= zricethezav/gitleaks:v8.30.1@sha256:c00b6bd0aeb3071cbcb79009cb16a60dd9e0a7c60e2be9ab65d25e6bc8abbb7f
+TRIVY_CACHE_VOLUME ?= template-python-trivy-cache
+
+# Lowest supported Python, used with the lowest declared direct dependencies.
+LOWEST_PYTHON ?= 3.12
+LOWEST_VENV ?= build/venv-lowest
 
 .PHONY: help
 help:
@@ -11,11 +25,15 @@ help:
 info: ## show information
 	@echo "GIT_REVISION: $(GIT_REVISION)"
 	@echo "GIT_TAG: $(GIT_TAG)"
+	@echo "PACKAGE_VERSION: $$(uv version --short)"
+
+# ---
+# Python
+# ---
 
 .PHONY: install-deps-dev
 install-deps-dev: ## install dependencies for development
 	uv sync --locked --group dev
-	@which actionlint || echo "install actionlint https://github.com/rhysd/actionlint"
 
 .PHONY: install-hooks
 install-hooks: ## install Git hooks
@@ -39,23 +57,29 @@ format: ## format code
 
 .PHONY: fix
 fix: ## apply auto-fixes
-	uv run --locked ruff check --fix
+	uv run --locked ruff check --fix .
 	uv run --locked ruff format .
 
 .PHONY: type-check
 type-check: ## check types with mypy
-	uv run --locked mypy --config-file pyproject.toml
+	uv run --locked mypy
 
 .PHONY: lint
-lint: type-check ## lint
+lint: type-check ## lint Python code and GitHub workflows
 	uv run --locked ruff check .
-	actionlint
-	uv run --locked zizmor --offline --strict-collection --min-severity high .
+	uv run --locked actionlint
+	uv run --locked zizmor --offline --min-severity low .
 
 .PHONY: test
-test: ## run tests
+test: ## run tests with coverage
 	uv run --locked pytest
 
+.PHONY: test-lowest
+test-lowest: ## run tests with the lowest supported Python and direct dependency versions
+	uv venv --quiet --clear --python $(LOWEST_PYTHON) $(LOWEST_VENV)
+	uv pip install --quiet --python $(LOWEST_VENV) --resolution lowest-direct --group test .
+	$(LOWEST_VENV)/bin/python -m pytest -p no:cacheprovider
+
 .PHONY: build
 build: ## build wheel and source distribution
 	uv build --clear
@@ -65,23 +89,58 @@ package-check: build ## test the built wheel and installed CLI
 	@wheel=$$(find dist -maxdepth 1 -name '*.whl' -type f -print -quit); \
 		test -n "$$wheel"; \
 		uv run --isolated --no-project --with "$$wheel" template-python hello --name Package | grep -Fx "Hello, Package!"; \
-		uv run --isolated --no-project --with "$$wheel" python -m template_python hello --name Module | grep -Fx "Hello, Module!"
+		uv run --isolated --no-project --with "$$wheel" python -m template_python hello --name Module | grep -Fx "Hello, Module!"; \
+		uv run --isolated --no-project --with "$$wheel" template-python --version | grep -Fx "template-python $$(uv version --short)"
 
 .PHONY: hooks-check
-hooks-check: ## check all configured hooks
+hooks-check: ## run all configured Git hooks against all files
 	uv run --locked prek run --all-files
 
 .PHONY: ci-test
 ci-test: install-deps-ci format-check lint test package-check ## run CI tests
 
 .PHONY: update
-update: ## update packages
+update: ## upgrade all locked packages
 	uv lock --upgrade
 
 .PHONY: jupyterlab
 jupyterlab: ## run Jupyter Lab
 	uv run --locked --no-dev --group notebook jupyter lab
 
+# ---
+# Security
+# ---
+
+.PHONY: audit
+audit: ## audit locked dependencies for known vulnerabilities
+	@requirements=$$(mktemp); trap 'rm -f "$$requirements"' EXIT; \
+		uv export --quiet --locked --all-groups --no-emit-project --format requirements-txt --output-file "$$requirements"; \
+		uv run --locked pip-audit --requirement "$$requirements" --require-hashes --disable-pip --strict --progress-spinner off
+
+.PHONY: secret-scan
+secret-scan: ## scan the Git history for secrets (requires Docker)
+	docker run --rm \
+		-v "$(CURDIR):/repo:ro" \
+		-e GIT_CONFIG_COUNT=1 -e GIT_CONFIG_KEY_0=safe.directory -e GIT_CONFIG_VALUE_0='*' \
+		$(GITLEAKS_IMAGE) git /repo --redact --no-banner --verbose
+
+.PHONY: security-scan
+security-scan: ## scan files for vulnerabilities, misconfigurations, and secrets (requires Docker)
+	docker run --rm \
+		-v "$(CURDIR):/src:ro" \
+		-v $(TRIVY_CACHE_VOLUME):/root/.cache/trivy \
+		$(TRIVY_IMAGE) fs \
+		--skip-version-check \
+		--scanners vuln,misconfig,secret \
+		--skip-dirs /src/.venv,/src/build,/src/dist,/src/site \
+		--exit-code 1 \
+		--ignore-unfixed \
+		--severity HIGH,CRITICAL \
+		/src
+
+.PHONY: ci-test-security
+ci-test-security: install-deps-ci audit secret-scan security-scan ## run CI security scans
+
 # ---
 # Docker
 # ---
@@ -89,11 +148,6 @@ DOCKER_REPO_NAME ?= ks6088ts
 DOCKER_IMAGE_NAME ?= template-python
 DOCKER_COMMAND ?= hello --name Container
 
-# Tools
-HADOLINT_VERSION ?= v2.15.1
-TRIVY_VERSION ?= 0.74.0
-TRIVY_CACHE_VOLUME ?= template-python-trivy-cache
-
 .PHONY: docker-build
 docker-build: ## build Docker image
 	docker build \
@@ -109,14 +163,15 @@ docker-run: ## run Docker container
 
 .PHONY: docker-lint
 docker-lint: ## lint Dockerfile
-	docker run --rm -i hadolint/hadolint:$(HADOLINT_VERSION) < Dockerfile
+	docker run --rm -i $(HADOLINT_IMAGE) < Dockerfile
 
 .PHONY: docker-scan
 docker-scan: ## scan Docker image
 	docker run --rm \
 		-v /var/run/docker.sock:/var/run/docker.sock \
 		-v $(TRIVY_CACHE_VOLUME):/root/.cache/trivy \
-		aquasec/trivy:$(TRIVY_VERSION) image \
+		$(TRIVY_IMAGE) image \
+		--skip-version-check \
 		--exit-code 1 \
 		--ignore-unfixed \
 		--severity HIGH,CRITICAL \
@@ -135,7 +190,7 @@ install-deps-docs: ## install dependencies for documentation
 
 .PHONY: docs
 docs: ## build documentation
-	uv run --locked --no-dev --group docs mkdocs build
+	uv run --locked --no-dev --group docs mkdocs build --strict
 
 .PHONY: docs-serve
 docs-serve: ## serve documentation
diff --git a/README.md b/README.md
index 0cb8787..234db1e 100644
--- a/README.md
+++ b/README.md
@@ -1,14 +1,18 @@
 [![test](https://github.com/ks6088ts/template-python/actions/workflows/test.yaml/badge.svg?branch=main)](https://github.com/ks6088ts/template-python/actions/workflows/test.yaml?query=branch%3Amain)
+[![security](https://github.com/ks6088ts/template-python/actions/workflows/security.yaml/badge.svg?branch=main)](https://github.com/ks6088ts/template-python/actions/workflows/security.yaml?query=branch%3Amain)
+[![codeql](https://github.com/ks6088ts/template-python/actions/workflows/codeql.yaml/badge.svg?branch=main)](https://github.com/ks6088ts/template-python/actions/workflows/codeql.yaml?query=branch%3Amain)
 [![docker](https://github.com/ks6088ts/template-python/actions/workflows/docker.yaml/badge.svg?branch=main)](https://github.com/ks6088ts/template-python/actions/workflows/docker.yaml?query=branch%3Amain)
-[![container-release](https://github.com/ks6088ts/template-python/actions/workflows/container-release.yaml/badge.svg)](https://github.com/ks6088ts/template-python/actions/workflows/container-release.yaml)
+[![release](https://github.com/ks6088ts/template-python/actions/workflows/release.yaml/badge.svg)](https://github.com/ks6088ts/template-python/actions/workflows/release.yaml)
 [![docs](https://github.com/ks6088ts/template-python/actions/workflows/github-pages.yaml/badge.svg)](https://github.com/ks6088ts/template-python/actions/workflows/github-pages.yaml)
+[![OpenSSF Scorecard](https://api.scorecard.dev/projects/github.com/ks6088ts/template-python/badge)](https://scorecard.dev/viewer/?uri=github.com/ks6088ts/template-python)
 
 # template-python
 
 [日本語ガイド](docs/index.ja.md) | [Documentation](https://ks6088ts-labs.github.io/template-python)
 
-A small, typed Python package and CLI template for starting a library or
-command-line application without assembling a toolchain from scratch.
+A small, typed Python CLI template with a production-grade toolchain: static
+analysis, tests with coverage, vulnerability and secret scanning, hardened
+containers, and CI/CD with signed releases.
 [Typer](https://typer.tiangolo.com/) handles the CLI,
 [Pydantic Settings](https://docs.pydantic.dev/latest/concepts/pydantic_settings/)
 validates configuration, and [uv](https://docs.astral.sh/uv/) manages the locked
@@ -16,15 +20,12 @@ environment. Containers, notebooks, and deployment are optional.
 
 ## Quick start
 
-Start with **Python 3.12+**, **uv 0.13.6**, and **GNU Make** for local development.
-The current local environment uses **Python 3.13.12** and **uv 0.13.6**.
-CI pins **uv 0.12.19** and uses **Python 3.13** for the full quality gate;
-compatibility tests also cover **Python 3.12 and 3.14**.
+You need **uv 0.13.x** (`>=0.13.1,<0.14`, declared in `pyproject.toml`) and
+**GNU Make**. uv installs the default **Python 3.14** from `.python-version`;
+Python **3.12–3.15** are supported and tested.
 See the [uv installation guide](https://docs.astral.sh/uv/getting-started/installation/)
-if uv is not installed. Docker, actionlint, and deployment credentials are not
-needed to run the example or unit tests.
-
-From a terminal:
+if uv is not installed. Docker and deployment credentials are not needed to run
+the example or the Python quality gate.
 
 ```shell
 git clone https://github.com/ks6088ts/template-python.git
@@ -39,26 +40,23 @@ Expected output:
 Hello, Ada!
 ```
 
-Then run `make test`. No virtual environment activation or `.env` file is
-required. The equivalent module entry point is
-`uv run --locked python -m template_python hello --name Ada`.
-
-Check the installed uv version and the Python runtime used by the project with:
+Then run `make ci-test`. No virtual environment activation or `.env` file is
+required. Other entry points:
 
 ```shell
-uv --version
-uv run --locked python --version
+uv run --locked template-python --version
+uv run --locked template-python config
+uv run --locked python -m template_python hello --name Ada
 ```
 
 ## Choose your next task
 
-Read only the guide needed for the change:
-
 | I want to... | Start here |
 | --- | --- |
 | Change behavior, run checks, or resolve a setup failure | [Development guide](docs/development.md) |
 | Decide where code belongs or whether to add an abstraction | [Architecture and engineering guide](docs/architecture/README.md) |
 | Configure the CLI | [Configuration reference](docs/development.md#configuration) |
+| Understand the security and release pipeline | [Security and supply chain](docs/architecture/README.md#security-and-supply-chain) |
 | Turn this template into a new project | [Template adoption checklist](docs/architecture/README.md#adopting-the-template) |
 | Preview or edit documentation | [Documentation workflow](docs/development.md#documentation) |
 
@@ -72,10 +70,11 @@ CLI (settings + logging) -> reusable core behavior
 | --- | --- |
 | [core.py](src/template_python/core.py) | Deterministic behavior, independent of CLI and environment |
 | [cli.py](src/template_python/cli.py) | Commands, user-facing errors, and application setup |
-| [settings.py](src/template_python/settings.py), [logging.py](src/template_python/logging.py) | Configuration validation and logging setup |
+| [settings.py](src/template_python/settings.py), [log.py](src/template_python/log.py) | Configuration validation and logging setup |
 | [tests/](tests/) | Behavior and CLI contract tests |
 | [Makefile](Makefile) | Supported local and CI commands; run `make help` to list them |
 | [pyproject.toml](pyproject.toml), [uv.lock](uv.lock) | Dependencies, tool configuration, and resolved versions |
+| [.github/](.github/) | CI/CD workflows, Dependabot, and contribution templates |
 | [docs/](docs/) | Task-oriented guides in English and Japanese |
 
 ## Before submitting a change
@@ -83,19 +82,18 @@ CLI (settings + logging) -> reusable core behavior
 | Changed area | Check |
 | --- | --- |
 | Python, dependencies, or workflows | `make ci-test` |
+| Dependencies | `make audit` and `make test-lowest` |
 | Documentation | `make ci-test-docs` |
 | Container assets | `make ci-test-docker` |
 
-The Python gate requires [actionlint](https://github.com/rhysd/actionlint/blob/main/docs/install.md)
-on `PATH`. The container gate requires a running Docker daemon. If a change spans
-areas, run each corresponding check. See the
-[development guide](docs/development.md#checks-by-change-type) for focused checks
-and Git hooks.
+Docker-based checks (`ci-test-docker`, `secret-scan`, `security-scan`) require a
+running Docker daemon. See the
+[development guide](docs/development.md#checks-by-change-type) for focused
+checks and Git hooks, and [CONTRIBUTING.md](CONTRIBUTING.md) for the pull
+request flow.
 
 ## Optional assets and releases
 
-Use these only when your project needs them:
-
 | Asset | Entry point |
 | --- | --- |
 | Container example | `make docker-build docker-run` or `docker compose up --build` |
@@ -104,13 +102,16 @@ Use these only when your project needs them:
 | VS Code Dev Container | [.devcontainer/](.devcontainer/) |
 | Image publishing and site deployment | [.github/workflows/](.github/workflows/) |
 
-No registry or cloud account is needed for local development. Remove unused
-assets and their related dependencies, Make targets, workflows, and links
-together; follow the [adoption checklist](docs/architecture/README.md#adopting-the-template).
+No registry or cloud account is needed for local development. Tags matching
+`v*` publish a multi-platform image with an SBOM and build provenance to GHCR
+after verifying that the tag equals `v` + the package version. This template does
+not publish to PyPI. See [delivery](docs/architecture/README.md#delivery) before
+enabling releases, and remove unused assets with the
+[adoption checklist](docs/architecture/README.md#adopting-the-template).
+
+## Security
 
-Tags matching `v*` publish images to Docker Hub and GHCR only after checking that
-the tag matches the package version. This template does not publish to PyPI.
-See [delivery rules](docs/architecture/README.md#delivery) before enabling releases.
+Report vulnerabilities privately; see [SECURITY.md](SECURITY.md).
 
 ## License
 
diff --git a/SECURITY.md b/SECURITY.md
new file mode 100644
index 0000000..2acae81
--- /dev/null
+++ b/SECURITY.md
@@ -0,0 +1,26 @@
+# Security policy
+
+## Supported versions
+
+Only the latest release and the `main` branch receive security fixes.
+
+## Reporting a vulnerability
+
+Do not open a public issue for a suspected vulnerability. Report it privately through
+[GitHub private vulnerability reporting](https://github.com/ks6088ts/template-python/security/advisories/new)
+and include:
+
+- the affected version or commit,
+- steps to reproduce or a proof of concept,
+- the impact you expect.
+
+You should receive an acknowledgement within 5 business days. Please allow time for a fix
+before any public disclosure.
+
+## Automated safeguards
+
+The repository continuously runs dependency auditing (pip-audit), secret scanning
+(gitleaks), file and image scanning (Trivy), static analysis (CodeQL, Ruff security rules),
+workflow analysis (actionlint, zizmor), and OpenSSF Scorecard. Release images are published
+with an SBOM and signed build provenance. See the
+[engineering guide](docs/architecture/README.md#security-and-supply-chain) for details.
diff --git a/compose.yml b/compose.yml
index fa15063..fcba76b 100644
--- a/compose.yml
+++ b/compose.yml
@@ -3,7 +3,14 @@ services:
     build:
       context: .
       dockerfile: Dockerfile
+    image: template-python:local
     command: ["hello", "--name", "Compose"]
     environment:
       PROJECT_LOG_LEVEL: INFO
+      PROJECT_LOG_FORMAT: json
       PROJECT_NAME: template-python-compose
+    read_only: true
+    security_opt:
+      - no-new-privileges:true
+    cap_drop:
+      - ALL
diff --git a/docs/architecture/README.ja.md b/docs/architecture/README.ja.md
index 0c3e5ad..cef078b 100644
--- a/docs/architecture/README.ja.md
+++ b/docs/architecture/README.ja.md
@@ -1,165 +1,190 @@
 # アーキテクチャとエンジニアリングガイド
 
-コードの置き場所、依存関係の追加、配布アセットの変更を判断するときに使います。
-実行手順とトラブル対応は[開発ガイド](../development.ja.md)を参照してください。
+コードの配置、依存関係の追加、配布用アセットの変更を判断するときに使います。
+実行手順やトラブルシューティングは[開発ガイド](../development.ja.md)を参照してください。
 
-## 既定の設計
+## 標準の設計 { #default-design }
 
-1つのインストール可能なパッケージと、薄いアプリケーション境界で構成します。
+このリポジトリは、インストール可能なパッケージ 1 つと、薄いアプリケーション境界 1 つで
+構成されています。
 
 ```text
-CLI（Typer、設定、ログ） -> コアロジック（値と具体的な例外）
+CLI（Typer、設定、ログ） -> コアの処理（値と具体的な例外）
 ```
 
-`src/template_python/core.py` は、環境変数、ログ、CLI の副作用を持たない決定的な
-処理を担当します。`cli.py` が設定を読み、ログを構成してコアを呼び出します。
-`__init__.py` は CLI を import せず再利用可能な処理を公開し、
-`__main__.py` は起動だけを担当します。
+`src/template_python/core.py` には、環境、ログ、CLI の副作用を持たない決定的な処理を
+置きます。`cli.py` は Typer のコールバックで設定を一度だけ読み込み、ログを構成し、
+設定を Click のコンテキスト（`ctx.obj`）に格納してコマンドへ渡し、コアを呼び出します。
+`__init__.py` は CLI を import せずに再利用可能な処理と `__version__` を公開し、
+`__main__.py` はガード付きのエントリーポイントに限定します。
 
-この分離により、ライブラリの利用者は関数を呼ぶだけなら、Typer、環境変数の
-読み込み、プロセス全体のログ設定を理解する必要がありません。
+これにより、ライブラリの利用者は関数を呼ぶだけのために Typer、環境変数の読み込み、
+プロセス全体のログ設定を理解する必要がなくなります。
 
-<a id="where-to-change-code"></a>
+## 変更箇所の早見表 { #where-to-change-code }
 
-## 変更箇所の早見表
-
-| 変更したいこと | 主な変更先 | テストする契約 |
+| 変更内容 | 主な変更箇所 | テストする契約 |
 | --- | --- | --- |
-| 再利用可能な処理 | `src/template_python/core.py` または目的の明確な新モジュール | `tests/test_core.py` または対応する新テストで、値・正規化・具体的な例外を確認 |
-| コマンド・オプション・利用者向けエラー | `src/template_python/cli.py` | `tests/test_cli.py` で stdout・stderr・終了コードを確認 |
-| 環境変数による設定 | `src/template_python/settings.py` と `.env.template` | `tests/test_settings.py` で既定値・許容値・拒否を確認 |
-| ログ設定 | `src/template_python/logging.py` | `tests/test_logging.py` でレベル検証・出力を確認 |
-| ライブラリの公開 API | `src/template_python/__init__.py` | CLI を初期化せず公開 API を import・実行できることを確認 |
-| ビルド・依存関係 | `pyproject.toml` と `uv.lock` | `make package-check` でインストール済み wheel の動作を確認 |
+| 再利用する処理 | `src/template_python/core.py` または責務を絞った新しいモジュール | 値、正規化、具体的な例外。`tests/test_core.py` または対応する新しいテスト |
+| コマンド、オプション、利用者向けエラー | `src/template_python/cli.py` | 標準出力、標準エラー出力、終了コード。`tests/test_cli.py` |
+| 環境設定 | `src/template_python/settings.py` と `.env.template` | 既定値、有効な値、優先順位、拒否。`tests/test_settings.py` |
+| ログ設定 | `src/template_python/log.py` | レベルと形式の検証、出力されるレコード。`tests/test_log.py` |
+| 公開ライブラリ API | `src/template_python/__init__.py` | CLI を初期化せずに公開 API を import して呼べること |
+| ビルドや依存関係の変更 | `pyproject.toml` と `uv.lock` | `make package-check` でインストール後の wheel、`make test-lowest` で下限を確認 |
 
-## 認知負荷を小さく保つ
+## 認知負荷を小さく保つ { #keep-the-cognitive-cost-small }
 
-既定の方針には理由があります。将来必要かもしれないものではなく、具体的な要求に
-応じて変更します。
+既定の方針は意図的に選んでいます。将来の可能性ではなく、具体的な要件があるときに
+変更してください。
 
-| 判断 | まず選ぶもの | 見直す条件 |
+| 判断 | 既定の方針 | 見直す条件 |
+| --- | --- | --- |
+| 新しい処理の置き場所 | 責務を絞ったモジュールに、名前付きの関数として置く | 具体的な外部 I/O の要件があり、アプリケーションのアダプターが必要になった |
+| コードを共通化するか | 局所に置き、責務が分かる名前を付ける | 複数の実際の呼び出し元で、同じ安定した動作が必要になった |
+| クラスやフレームワークを追加するか | 関数と明示的な引数を優先する | 状態やライフサイクルの管理が必要で、単純な組み合わせでは足りない |
+| 依存関係やツールを追加するか | 標準ライブラリと既存のツールを使う | 明確で測定できる不足があり、実行時と保守のコストに見合う |
+| 任意のアセットを追加するか | 使わないなら置かない、または削除する | 実際の配布や開発の要件で必要になった |
+
+- 汎用的な `utils` / `common`、基底クラスの階層、サービスロケーター、
+  先回りした DI フレームワークは避けます。
+- 標準ライブラリと同じ名前のモジュールは作りません（ログ設定は `logging.py` ではなく
+  `log.py` に置いています）。
+- 入力、出力、責務が分かる名前を使います。小さな処理を理解するために、
+  何層もたどる必要がないようにします。
+- 値を返すか、具体的な例外を送出します。失敗を成功に見える既定値に変えたり、
+  エラーを広く握りつぶしたり、シークレットをログに出したりしないでください。
+- 各作業の正式な手順は 1 か所にまとめます。複数のドキュメントやワークフローに
+  コマンドをコピーせず、リンクします。
+
+自明でない判断は、問題、最も単純な代替案、選んだトレードオフ、検証方法を
+プルリクエストの説明に記載します。別の設計ドキュメントは、その理由を変更後も
+長く残す必要がある場合にだけ作成します。
+
+## 技術選定 { #technology-choices }
+
+広く使われ、継続的に保守され、インターフェースが安定したツールを選んでいます。
+バージョンは現在のメジャー（0.x のツールはマイナー）までに制限し、`uv.lock` で
+解決します。
+
+| 関心事 | 選定 | 理由 |
 | --- | --- | --- |
-| 新しい処理の置き場所 | 目的の明確なモジュールの名前付き関数 | 外部 I/O の具体的な要求によりアプリケーション側の adapter が必要 |
-| 共通化するか | 責務が分かる名前で局所的に実装 | 複数の実際の利用箇所で同じ安定した振る舞いが必要 |
-| class・framework を追加するか | 関数と明示的な引数 | 状態や lifecycle の所有者が必要で、単純な組み合わせでは不足 |
-| 依存関係・ツールを追加するか | 標準ライブラリと既存ツール | 実行時・保守時のコストに見合う、測定可能な不足がある |
-| 任意アセットを使うか | 未使用のままにするか削除 | 実際の配布・開発要件で必要 |
-
-- `utils`・`common` の寄せ集め、基底クラス階層、サービスロケータ、
-  将来を想像した DI framework は避けます。
-- 入出力と責務を表す名前を使います。小さな処理を理解するために、何層ものコードを
-  追う必要がない構造にします。
-- 値を返すか、具体的な例外を送出します。失敗を成功に見える既定値へ置き換えたり、
-  広く握りつぶしたり、秘密情報をログへ出したりしません。
-- 手順の正本を1つにします。複数の文書や Workflow へコマンドをコピーせず、
-  参照・再利用します。
-
-自明ではない判断は、問題、最も単純な代替案、選んだトレードオフ、検証方法を
-PR の説明に残します。別の設計文書は、その変更後も理由を参照する必要があるとき
-だけ作ります。
-
-## 情報の正本
-
-| 対象 | 正本 |
+| 環境、ロック、ビルド | uv、`uv_build` | Python、仮想環境、ロック、ビルドを 1 つで扱い、ハッシュ付きで再現できる |
+| CLI | Typer（Click ベース） | 型ヒント駆動で、成熟した Click の上に構築されている |
+| 設定 | Pydantic Settings | 型付きで検証された環境変数と `.env` の読み込み |
+| 整形と Lint | Ruff | フォーマッターと、bandit（`S`）のセキュリティルールを含む幅広いルール |
+| 型 | mypy（strict）と Pydantic プラグイン | 基準となる型チェッカー |
+| テスト | pytest（strict モード）、pytest-cov | 事実上の標準 |
+| Git フック | prek（pre-commit 互換） | `.pre-commit-config.yaml` を読み、別の Python 環境が不要 |
+| 依存関係の監査 | pip-audit | PyPA が保守。`uv audit` はまだ experimental |
+| シークレットスキャン | gitleaks | フックと履歴全体のスキャン |
+| ファイルとイメージのスキャン | Trivy（イメージのダイジェストを固定） | ロックファイル、Dockerfile、シークレット、OS パッケージ |
+| ワークフローの解析 | actionlint、zizmor、CodeQL（`actions`） | 構文、セキュリティ、データフローの検査 |
+| ドキュメント | MkDocs + Material | 安定していて広く使われている。Material は 2027-05-05 にサポートが終了する（それまでは重大な修正が提供される）。終了日までに、`mkdocs.yml` をそのまま読める後継の [Zensical](https://zensical.org/docs/compatibility/mkdocs/migration/) への移行を計画する |
+
+## 正本の一覧 { #sources-of-truth }
+
+| 関心事 | 正本 |
 | --- | --- |
 | メタデータ、依存関係、ツール設定 | `pyproject.toml` |
-| 解決済み依存バージョン | `uv.lock` |
+| 解決済みの依存関係とツールのバージョン | `uv.lock` |
+| uv のバージョン範囲 | `pyproject.toml` の `[tool.uv] required-version`（CI の `setup-uv` も参照） |
+| 既定の Python / サポートするバージョン | `.python-version` / `requires-python`、classifiers、`.github/workflows/test.yaml` |
 | ローカルと CI のコマンド | `Makefile` |
-| 最低 Python・テスト対象バージョン | `pyproject.toml`・`.github/workflows/test.yaml` |
-| 設定の schema・設定例 | `src/template_python/settings.py`・`.env.template` |
-| コンテナ動作 | `Dockerfile` と `compose.yml` |
-| ドキュメント構成 | `mkdocs.yml` |
-
-宣言と、その宣言から生成するものは一緒に更新します。依存関係は
-`pyproject.toml` で変更し、`uv lock` で lock を再生成します。
-CI は同じ検証を独自に実装せず、Make target を呼びます。
-
-## ランタイムのルール
-
-- パッケージの import 時にログ設定や環境変数読み込みを行いません。
-- コアは Typer や設定に依存せず、CLI が値と例外を表示・終了コードへ変換します。
-- `ProjectSettings` が `PROJECT_*` と任意の `.env` を一元管理します。
-  別の dotenv loader を追加しません。
-- root logger の設定は CLI callback で一度だけ行い、ライブラリは名前付き
-  logger を取得するだけにします。
-- CLI は `[project.scripts]` で公開し、`python -m template_python` も維持します。
-
-## 品質ゲート
-
-[変更内容に応じた検証](../development.ja.md#checks-by-change-type)を選びます。
-Python の品質ゲートは、整形、型、Lint、Workflow のルール、全テストを確認し、
-branch coverage **95% 以上**を要求します。wheel と sdist をビルドした後、
-wheel の CLI とモジュール起動を隔離環境で確認します。
-sdist のインストール試験は行いません。
-
-内部構造ではなく、失敗時を含む観測可能な契約をテストします。互換性を壊す必要が
-明示されていない限り、stdout、stderr、終了コード、import 時の動作を保ちます。
-
-## 配布
-
-- Pull Request と対象ブランチで Python とコンテナを検証します。
-- `main` から GitHub Pages へ英日ドキュメントを公開します。
-- `v*` tag から Docker Hub と GHCR へ multi-platform image を公開します。
-- GHCR release には push 済み digest に対応する provenance を付与します。
-- Azure Static Web Apps は手動デプロイを維持します。
-
-Release Workflow は、tag が `v` と `pyproject.toml` の version を連結した値に
-一致することを確認してから公開します。Docker Hub には
-`DOCKERHUB_USERNAME` と `DOCKERHUB_TOKEN` の secret が必要です。
-GHCR は Workflow の GitHub token を使います。手動のサイト公開には
-`AZURE_STATIC_WEB_APPS_API_TOKEN` が必要です。これらの認証情報はローカル開発に
-不要です。PyPI への公開は設定されていません。
-
-外部 Action は commit SHA で固定します。Workflow は明示的な最小権限、
-checkout credential の無効化、timeout を使い、自動キャンセルは後続実行で
-置き換えられる release 以外の処理に限定します。
-
-<a id="adopting-the-template"></a>
-
-## テンプレートの導入
-
-新しいプロジェクトを作ったときに一度行い、公開を有効にする前に確認します。
-
-1. `pyproject.toml` の配布名、説明、version、URL、console script を設定し、
-   ライセンスが適切か確認します。
-2. import 名を変えるなら `src/template_python/` を改名し、import、テストの参照、
-   script の参照先、モジュール起動コマンド、coverage などのツール設定も揃えます。
-   型付きパッケージの `py.typed` は維持します。
-3. 設定の既定値、`.env.template`、Notebook の例、Makefile の配布物検証コマンドと
-   image の既定値、Dockerfile の起動先と label、Compose、Dev Container 名、
-   docs の URL、Workflow の image 名、README の badge を更新します。
-   配布名はハイフン、Python の import 名はアンダースコアを使います。
-4. 次の表に従い不要なアセットを外し、実行できない CI の参照を残しません。
-5. `uv lock` を実行し、残したアセットを検証します。ソースの直接 import だけでなく、
-   改名後のインストール済み CLI を確認します。
-6. 残した配布 Workflow にだけ、リポジトリの公開設定と secret を用意します。
-   release tag とパッケージ version を一致させます。
-
-### 任意アセット
-
-Notebook、docs、コンテナ、registry、Azure、Dev Container は独立したサンプルです。
-別のアプリケーション動作を作らず、インストール済みパッケージを利用します。
-
-| 外すアセット | 同時に削除・更新するもの |
-| --- | --- |
-| Notebook | `notebooks/`、`notebook` 依存グループ、`jupyterlab` Make target |
-| ドキュメントサイト | `docs/`、`mkdocs.yml`、`docs` グループと Make target、両サイト公開 Workflow、`test.yaml` の docs コマンド |
-| コンテナ | Dockerfile、Compose、`.dockerignore`、Docker の Make target・変数、コンテナ検証・公開 Workflow |
-| registry 公開だけ | 不要な job または container-release Workflow。必要ならローカルのコンテナ検証は残す |
-| 手動のサイト公開だけ | `azure-static-web-app.yaml` とデプロイの説明 |
-| Dev Container | `.devcontainer/` と環境構築の説明 |
-
-依存グループを変更したら lock を再生成し、badge、リンク、ガイドの項目も同じ変更で
-整理します。認証情報を要求する未使用の Workflow を残さないでください。
-
-多言語出力が MkDocs 1 の plugin ecosystem に依存する間、MkDocs は 2 未満に
-固定します。
-
-## 変更チェックリスト
-
-- [ ] 変更の目的が1つで、上記のモジュール境界を守っている。
-- [ ] 期待する値と失敗をテストし、互換性を変える場合は明示している。
-- [ ] 依存宣言、lock、影響する配布アセットが一致している。
-- [ ] コマンドは既存 Make target を再利用し、新ツールは実際の不足を補っている。
-- [ ] 影響する英日ドキュメントを更新し、手順を重複させていない。
-- [ ] 変更した各領域の検証が成功し、必要なインストール済みパッケージの確認も行った。
+| Git フック | `.pre-commit-config.yaml` |
+| 設定スキーマ / 上書き例 | `src/template_python/settings.py` / `.env.template` |
+| コンテナの動作 | `Dockerfile`、`.dockerignore`、`compose.yml` |
+| 依存関係の更新方針 | `.github/dependabot.yaml` |
+| ドキュメントのナビゲーション | `mkdocs.yml` |
+
+宣言と、そこから生成されるアセットは一緒に更新します。依存関係の宣言は
+`pyproject.toml` で変更し、`uv lock` で `uv.lock` を再生成します。CI は同じ検証を
+別に実装せず、Make ターゲットを呼び出します。
+
+## 実行時のルール { #runtime-rules }
+
+- 公開パッケージは、ログ設定や環境変数の読み込みを行わずに import できる状態を
+  保ちます。
+- コアモジュールは Typer や設定に依存しません。CLI がコアの値と例外を、利用者向けの
+  出力と終了コードに変換します。
+- `PROJECT_*` 環境変数と任意の `.env` の読み込みは `ProjectSettings` が担当します。
+  2 つ目の dotenv ローダーは追加しないでください。コマンドは設定を再度読み込まず、
+  コンテキストから取得します。
+- ルートロガーの設定は CLI のコールバックで一度だけ行います。ライブラリのモジュールは
+  名前付きロガーを取得するだけにします。ログを収集する環境では
+  `PROJECT_LOG_FORMAT=json` を使います。
+- シークレットは `SecretStr` で宣言します。Typer の整形された例外表示ではローカル
+  変数を表示しないため、トレースバックからシークレットが漏れません。
+- コマンドは `[project.scripts]` で公開し、`python -m template_python` は補助的な
+  実行方法として維持します。
+
+## 品質ゲート { #quality-gate }
+
+[変更内容ごとの検証](../development.ja.md#checks-by-change-type)に従います。
+Python の検証では、整形、strict な型、拡張した Ruff のルール（bandit のセキュリティ
+ルールを含む）、ワークフローのルール、全テストの分岐カバレッジ 95% 以上を確認します。
+さらに wheel と sdist をビルドし、インストールした wheel の CLI、モジュール実行、
+`--version` を隔離環境で実行します。sdist からのインストールは検証しません。
+
+内部構造に結びついたテストではなく、失敗時を含む外から観測できる契約をテストします。
+明示的に互換性を破る変更でない限り、標準出力、標準エラー出力、終了コード、
+import 時の動作を維持します。
+
+## セキュリティとサプライチェーン { #security-and-supply-chain }
+
+| 層 | 対策 | 場所 |
+| --- | --- | --- |
+| ソースコード | Ruff の `S` ルール、CodeQL（`python`、`actions`、security-extended） | `make lint`、`codeql.yaml` |
+| シークレット | gitleaks のフック、履歴全体のスキャン、Trivy のシークレットスキャナー、`detect-private-key` | フック、`make secret-scan`、`make security-scan` |
+| 依存関係 | ロック済みの全パッケージを pip-audit で監査（ハッシュ検証）、Trivy による `uv.lock` のスキャン、クールダウン付きの Dependabot | `make audit`、`make security-scan`、`dependabot.yaml` |
+| ワークフロー | Actions を SHA で固定、最小限の `permissions`、`persist-credentials: false`、公開用ワークフローではキャッシュを使わない、actionlint と zizmor | `.github/workflows/`、`make lint` |
+| コンテナ | ベースイメージと uv イメージをダイジェストで固定、ハッシュ付きロックから `uv sync --locked`、非 root ユーザー、実行イメージに pip を含めない、hadolint、Trivy によるイメージのスキャン | `Dockerfile`、`make ci-test-docker` |
+| リリース | タグとバージョンの一致確認、公開前のスキャン、SBOM と max モードのプロベナンス、GitHub の artifact attestation | `release.yaml` |
+| 全体の健全性 | OpenSSF Scorecard を毎週公開 | `scorecard.yaml` |
+
+`security.yaml` はプルリクエスト、`main`、毎週のスケジュールで
+`make ci-test-security` を実行します。新しく公開された脆弱性は、コードを変更しなくても
+CI の失敗として検出されます。
+
+## 配布 { #delivery }
+
+- プルリクエストと対象ブランチでは、Python、セキュリティ、CodeQL、コンテナの検証を
+  実行します。
+- `main` では、英語と日本語のドキュメントを GitHub Pages の成果物として公開します。
+- `v*` タグでは `release.yaml` が動き、マルチプラットフォーム（`linux/amd64`、
+  `linux/arm64`）のイメージを GHCR に公開します。
+- Azure Static Web Apps へのデプロイは手動のままです。
+
+リリースワークフローは、まずタグが `v` と `pyproject.toml` のバージョンを連結したものと
+完全に一致することを確認します。次にイメージをビルドして Trivy でスキャンし、
+SBOM とビルドプロベナンスを付けて push し、GitHub の artifact attestation を記録します。
+タグは PEP 440 に従います。`v1.2.3` は `1.2.3`、`1.2`、`latest` を公開し、
+`v1.3.0rc1` のようなプレリリースは `1.3.0rc1` だけを公開します。イメージは次のように
+検証できます。
+
+```shell
+gh attestation verify oci://ghcr.io/ks6088ts/template-python:<version> --owner ks6088ts
+```
+
+GHCR はワークフローの `GITHUB_TOKEN` を使います。手動のサイトデプロイには
+`AZURE_STATIC_WEB_APPS_API_TOKEN` が必要です。これらの認証情報はローカル開発には
+不要です。PyPI と Docker Hub への公開は設定していません。
+
+## テンプレートの導入 { #adopting-the-template }
+
+1. 配布名とパッケージ名を変更します。`pyproject.toml`、`src/`、テスト、`Makefile`、
+   `Dockerfile`、`compose.yml`、ワークフロー、`mkdocs.yml`、ドキュメントに含まれる
+   `template-python` / `template_python` を置き換え、`uv lock` を実行します。
+2. `pyproject.toml` の URL、`.github/CODEOWNERS`、`SECURITY.md`、バッジ、
+   `mkdocs.yml` のオーナー名を置き換えます。
+3. 設定のプレフィックス（`PROJECT_`）を決め、`.env.template` と設定リファレンスを
+   更新します。
+4. `hello` コマンドと `core.greeting` を実際の処理とテストに置き換えます。
+   `--version` と `config` は残します。
+5. 使わない任意のアセットは、依存関係、Make ターゲット、ワークフロー、リンクと一緒に
+   削除します。対象は Notebook のグループと `notebooks/`、MkDocs と Pages/SWA の
+   ワークフロー、Dev Container、`compose.yml` です。
+6. リポジトリの設定で、private vulnerability reporting、Dependabot アラート、
+   コードスキャン、`test`・`security`・`codeql`・`docker` のチェックを必須とする
+   ブランチ保護を有効にします。
+7. `make ci-test ci-test-docs ci-test-security ci-test-docker` を実行し、
+   最初のリリースのタグを付けます。
diff --git a/docs/architecture/README.md b/docs/architecture/README.md
index ddc9bc7..85ed01c 100644
--- a/docs/architecture/README.md
+++ b/docs/architecture/README.md
@@ -4,7 +4,7 @@ Use this guide when deciding where code belongs, adding a dependency, or changin
 delivery assets. For executable procedures and troubleshooting, use the
 [development guide](../development.md).
 
-## Default design
+## Default design { #default-design }
 
 The repository has one installable package and one thin application boundary:
 
@@ -13,25 +13,27 @@ CLI (Typer, settings, logging) -> core behavior (values and specific exceptions)
 ```
 
 `src/template_python/core.py` contains deterministic behavior with no
-environment, logging, or CLI side effects. `cli.py` loads settings, configures
-logging, and calls the core. `__init__.py` exports reusable behavior without
-importing the CLI; `__main__.py` is only an entry point.
+environment, logging, or CLI side effects. `cli.py` loads settings once in the
+Typer callback, configures logging, stores the settings on the Click context
+(`ctx.obj`) for commands, and calls the core. `__init__.py` exports reusable
+behavior and `__version__` without importing the CLI; `__main__.py` is only a
+guarded entry point.
 
 This keeps library consumers from needing to understand Typer, environment
 loading, or process-global logging just to call a function.
 
-## Where to change code
+## Where to change code { #where-to-change-code }
 
 | Change | Primary location | Contract to test |
 | --- | --- | --- |
 | Reusable behavior | `src/template_python/core.py` or a focused new module | Values, normalization, and specific exceptions in `tests/test_core.py` or a matching new test module |
 | Command, option, or user-facing error | `src/template_python/cli.py` | stdout, stderr, and exit codes in `tests/test_cli.py` |
-| Environment configuration | `src/template_python/settings.py` and `.env.template` | Defaults, valid values, and rejection in `tests/test_settings.py` |
-| Logging setup | `src/template_python/logging.py` | Level validation and emitted messages in `tests/test_logging.py` |
+| Environment configuration | `src/template_python/settings.py` and `.env.template` | Defaults, valid values, precedence, and rejection in `tests/test_settings.py` |
+| Logging setup | `src/template_python/log.py` | Level/format validation and emitted records in `tests/test_log.py` |
 | Public library API | `src/template_python/__init__.py` | Import and call the public API without initializing the CLI |
-| Build or dependency change | `pyproject.toml` and `uv.lock` | Installed wheel behavior via `make package-check` |
+| Build or dependency change | `pyproject.toml` and `uv.lock` | Installed wheel behavior via `make package-check`; lower bounds via `make test-lowest` |
 
-## Keep the cognitive cost small
+## Keep the cognitive cost small { #keep-the-cognitive-cost-small }
 
 Defaults are deliberate. Change them for a concrete requirement, not a possible
 future one.
@@ -46,6 +48,8 @@ future one.
 
 - Avoid generic `utils` / `common` buckets, base-class hierarchies, service
   locators, and speculative dependency-injection frameworks.
+- Do not name modules after the standard library (the logging setup lives in
+  `log.py`, not `logging.py`).
 - Use names that reveal inputs, outputs, and responsibility. A reader should not
   need to follow several layers to understand a small operation.
 - Return values or raise specific exceptions. Do not turn failures into
@@ -57,112 +61,129 @@ For a non-obvious decision, include the problem, simplest alternative, chosen
 trade-off, and verification in the PR description. A separate design document
 is only useful when the rationale needs to outlive the change.
 
-## Sources of truth
+## Technology choices { #technology-choices }
+
+The stack favors widely adopted, actively maintained tools with stable
+interfaces. Versions are bounded to the current major (or minor for 0.x tools)
+and resolved in `uv.lock`.
+
+| Concern | Choice | Why |
+| --- | --- | --- |
+| Environment, lock, build | uv, `uv_build` | One tool for Python, venv, locking, and builds; reproducible with hashes |
+| CLI | Typer (on Click) | Type-hint driven, mature Click foundation |
+| Configuration | Pydantic Settings | Validated, typed environment and `.env` loading |
+| Format and lint | Ruff | Formatter plus a broad rule set including bandit (`S`) security rules |
+| Types | mypy (strict) with the Pydantic plugin | Reference type checker |
+| Tests | pytest (strict mode), pytest-cov | De facto standard |
+| Git hooks | prek (pre-commit compatible) | Reads `.pre-commit-config.yaml`; no separate Python environment |
+| Dependency audit | pip-audit | PyPA-maintained; `uv audit` is still experimental |
+| Secret scan | gitleaks | Hook and full-history scan |
+| File and image scan | Trivy (pinned image digest) | Lock file, Dockerfile, secrets, and OS packages |
+| Workflow analysis | actionlint, zizmor, CodeQL (`actions`) | Syntax, security, and data-flow checks |
+| Documentation | MkDocs + Material | Stable and widely used. Material reaches end of life on 2027-05-05 (critical fixes until then); plan a migration to its successor [Zensical](https://zensical.org/docs/compatibility/mkdocs/migration/), which reads `mkdocs.yml`, before that date |
+
+## Sources of truth { #sources-of-truth }
 
 | Concern | Source |
 | --- | --- |
 | Metadata, dependencies, tool configuration | `pyproject.toml` |
-| Resolved dependency versions | `uv.lock` |
+| Resolved dependency and tool versions | `uv.lock` |
+| uv version range | `[tool.uv] required-version` in `pyproject.toml` (also read by `setup-uv` in CI) |
+| Default Python / supported versions | `.python-version` / `requires-python`, classifiers, and `.github/workflows/test.yaml` |
 | Local and CI commands | `Makefile` |
-| Minimum Python / tested versions | `pyproject.toml` / `.github/workflows/test.yaml` |
+| Git hooks | `.pre-commit-config.yaml` |
 | Configuration schema / example overrides | `src/template_python/settings.py` / `.env.template` |
-| Container behavior | `Dockerfile` and `compose.yml` |
+| Container behavior | `Dockerfile`, `.dockerignore`, and `compose.yml` |
+| Dependency update policy | `.github/dependabot.yaml` |
 | Documentation navigation | `mkdocs.yml` |
 
 Update declarations and derived assets together. Dependency declarations change
 in `pyproject.toml`; regenerate `uv.lock` with `uv lock`. CI should call Make
 targets instead of maintaining another implementation of the same checks.
 
-## Runtime rules
+## Runtime rules { #runtime-rules }
 
 - The public package must remain importable without configuring logging or
   reading environment variables.
 - Core modules do not depend on Typer or settings. The CLI translates their
   values and exceptions into user-facing output and exit codes.
 - `ProjectSettings` owns `PROJECT_*` environment and optional `.env` loading.
-  Do not add a second dotenv loader.
+  Do not add a second dotenv loader. Commands read settings from the context
+  rather than loading them again.
 - Configure root logging once in the CLI callback. Library modules only obtain
-  named loggers.
+  named loggers. Use `PROJECT_LOG_FORMAT=json` where logs are collected.
+- Declare secrets as `SecretStr`. Typer's pretty exceptions do not show local
+  variables, so tracebacks do not leak secret values.
 - Expose commands through `[project.scripts]`; keep `python -m template_python`
   as a convenience path.
 
-## Quality gate
+## Quality gate { #quality-gate }
 
 Use the [checks by change type](../development.md#checks-by-change-type).
-The Python gate checks formatting, types, lint, workflow rules, and all tests
-with branch coverage of at least 95%. It builds wheel and sdist, then runs the
-installed wheel's CLI and module entry point in isolation. It does not smoke-test
-the sdist installation.
+The Python gate checks formatting, strict types, an extended Ruff rule set
+(including bandit security rules), workflow rules, and all tests with branch
+coverage of at least 95%. It builds wheel and sdist, then runs the installed
+wheel's CLI, module entry point, and `--version` in isolation. It does not
+smoke-test the sdist installation.
 
 Test observable contracts, including failure paths, instead of coupling tests
 to internal structure. Keep stdout, stderr, exit codes, and import-time behavior
 stable unless the change explicitly requires a compatibility break.
 
-## Delivery
+## Security and supply chain { #security-and-supply-chain }
+
+| Layer | Control | Where |
+| --- | --- | --- |
+| Source | Ruff `S` rules, CodeQL (`python`, `actions`, security-extended) | `make lint`, `codeql.yaml` |
+| Secrets | gitleaks hook, full-history scan, Trivy secret scanner, `detect-private-key` | Hooks, `make secret-scan`, `make security-scan` |
+| Dependencies | pip-audit on every locked package (hash-verified), Trivy on `uv.lock`, Dependabot with cooldown | `make audit`, `make security-scan`, `dependabot.yaml` |
+| Workflows | Actions pinned by SHA, minimal `permissions`, `persist-credentials: false`, no cache in publishing workflows, actionlint and zizmor | `.github/workflows/`, `make lint` |
+| Container | Digest-pinned base and uv images, `uv sync --locked` from hashed lock, non-root user, no pip in the runtime image, hadolint, Trivy image scan | `Dockerfile`, `make ci-test-docker` |
+| Release | Tag/version check, pre-release scan, SBOM and max-mode provenance, GitHub artifact attestation | `release.yaml` |
+| Posture | OpenSSF Scorecard published weekly | `scorecard.yaml` |
+
+`security.yaml` runs `make ci-test-security` on pull requests, on `main`, and
+weekly, so newly disclosed vulnerabilities fail CI without a code change.
 
-- Pull requests and supported branches run Python and container validation.
+## Delivery { #delivery }
+
+- Pull requests and supported branches run Python, security, CodeQL, and
+  container validation.
 - `main` publishes the bilingual documentation with GitHub Pages artifacts.
-- `v*` tags publish multi-platform images to Docker Hub and GHCR.
-- GHCR releases include build provenance tied to the pushed digest.
+- `v*` tags run `release.yaml`, which publishes a multi-platform
+  (`linux/amd64`, `linux/arm64`) image to GHCR.
 - Azure Static Web Apps deployment remains manual.
 
-The release workflow verifies that the tag is exactly `v` followed by the
-`pyproject.toml` version before publishing. It requires `DOCKERHUB_USERNAME` and
-`DOCKERHUB_TOKEN` secrets for Docker Hub; GHCR uses the workflow's GitHub token.
-The manual site workflow requires `AZURE_STATIC_WEB_APPS_API_TOKEN`. These
-credentials are not required for local development. PyPI publishing is not
-configured.
-
-Third-party actions are pinned by commit SHA. Workflows use explicit minimum
-permissions, disabled checkout credentials, bounded timeouts, and cancellation
-only for superseded non-release runs.
-
-## Adopting the template
-
-Do this once when creating a project, before enabling publishing.
-
-1. Set the project identity: distribution name, description, version, URLs, and
-   console script in `pyproject.toml`. Confirm the license is appropriate.
-2. If renaming the import package, rename `src/template_python/` and update
-   imports, test references, the script target, module-entry commands, and tool
-   paths such as coverage. Preserve `py.typed` for the typed package.
-3. Update settings defaults, `.env.template`, notebook examples, Makefile smoke
-   commands and image defaults, Dockerfile entry point and labels, Compose,
-   Dev Container name, documentation URLs, workflow image names, and README
-   badges. Distribution names use hyphens; Python import names use underscores.
-4. Remove unneeded assets using the table below; do not leave dead CI references.
-5. Run `uv lock` and checks for the retained assets. Verify the renamed installed
-   CLI, not just a direct source import.
-6. Configure repository publishing settings and secrets only for retained
-   delivery workflows. Match the package version to the release tag.
-
-### Optional assets
-
-Notebook, docs, containers, registries, Azure, and the Dev Container are
-independent examples. They must consume the installed package rather than
-creating alternative application behavior.
-
-| Remove this asset | Also remove or update |
-| --- | --- |
-| Notebook | `notebooks/`, the `notebook` dependency group, and `jupyterlab` Make target |
-| Documentation site | `docs/`, `mkdocs.yml`, the `docs` group and Make targets, both site deployment workflows, and the docs command in `test.yaml` |
-| Containers | Dockerfile, Compose, `.dockerignore`, Docker Make targets/variables, and container validation/release workflows |
-| Registry publishing only | Unneeded jobs or the container-release workflow; keep local container checks if still useful |
-| Manual site deployment only | `azure-static-web-app.yaml` and deployment references |
-| Dev Container | `.devcontainer/` and setup references |
-
-In the same change, regenerate the lock file if groups changed and clean up
-badges, links, and guide entries. Avoid keeping an unused workflow that requires
-credentials.
-
-MkDocs is intentionally constrained below version 2 while multilingual output
-depends on the MkDocs 1 plugin ecosystem.
-
-## Change checklist
-
-- [ ] The change has one clear purpose and uses the module boundaries above.
-- [ ] Tests cover the expected values and failures; compatibility changes are explicit.
-- [ ] Dependency declarations, lock file, and affected delivery assets agree.
-- [ ] Commands reuse existing Make targets; any new tool fills a demonstrated gap.
-- [ ] Affected English and Japanese documentation is updated without duplicating procedures.
-- [ ] Checks for each changed area pass, including installed-package checks where relevant.
+The release workflow first verifies that the tag is exactly `v` followed by the
+`pyproject.toml` version. It builds and scans an image with Trivy, then pushes
+with an SBOM and build provenance and records a GitHub artifact attestation.
+Tags follow PEP 440: `v1.2.3` publishes `1.2.3`, `1.2`, and `latest`; a
+pre-release such as `v1.3.0rc1` publishes only `1.3.0rc1`. Verify an image with:
+
+```shell
+gh attestation verify oci://ghcr.io/ks6088ts/template-python:<version> --owner ks6088ts
+```
+
+GHCR uses the workflow's `GITHUB_TOKEN`. The manual site workflow requires
+`AZURE_STATIC_WEB_APPS_API_TOKEN`. These credentials are not required for local
+development. PyPI and Docker Hub publishing are not configured.
+
+## Adopting the template { #adopting-the-template }
+
+1. Rename the distribution and package: `template-python` / `template_python`
+   in `pyproject.toml`, `src/`, tests, `Makefile`, `Dockerfile`, `compose.yml`,
+   workflows, `mkdocs.yml`, and docs. Run `uv lock`.
+2. Replace the owner in `pyproject.toml` URLs, `.github/CODEOWNERS`,
+   `SECURITY.md`, badges, and `mkdocs.yml`.
+3. Choose the settings prefix (`PROJECT_`) and update `.env.template` and the
+   configuration reference.
+4. Replace the `hello` command and `core.greeting` with real behavior and tests;
+   keep `--version` and `config`.
+5. Remove unused optional assets together with their dependencies, Make
+   targets, workflows, and links: the notebook group and `notebooks/`, MkDocs and
+   the Pages/SWA workflows, the Dev Container, or `compose.yml`.
+6. In repository settings, enable private vulnerability reporting, Dependabot
+   alerts, code scanning, and branch protection requiring the `test`,
+   `security`, `codeql`, and `docker` checks.
+7. Run `make ci-test ci-test-docs ci-test-security ci-test-docker` and tag the
+   first release.
diff --git a/docs/development.ja.md b/docs/development.ja.md
index 3797313..b6db61f 100644
--- a/docs/development.ja.md
+++ b/docs/development.ja.md
@@ -5,15 +5,14 @@
 [エンジニアリングガイド](architecture/README.ja.md)を参照してください。
 以下のコマンドはすべてリポジトリのルートで実行します。
 
-## 最初に一度だけ準備する
+## 最初に一度だけ準備する { #set-up-once }
 
 | ツール | 必要になる場面 |
 | --- | --- |
-| Python 3.12+ | パッケージとテスト。CI の全検証に合わせるなら 3.13 |
-| [uv 0.12.19](https://docs.astral.sh/uv/getting-started/installation/) | ロック済み依存関係の管理とコマンド実行 |
+| [uv 0.13.x](https://docs.astral.sh/uv/getting-started/installation/) | 常に必要。`pyproject.toml` で `>=0.13.1,<0.14` を要求 |
+| Python 3.12〜3.15 | uv が必要に応じて導入。`.python-version` で 3.14 を選択 |
 | GNU Make | リポジトリの標準コマンド |
-| [actionlint](https://github.com/rhysd/actionlint/blob/main/docs/install.md) | `make lint` と `make ci-test`。CI は 1.7.12 を使用 |
-| Docker と起動済みの daemon | コンテナ関連のコマンドだけ |
+| Docker と起動済みのデーモン | コンテナ検証、`secret-scan`、`security-scan` のみ |
 
 ```shell
 make install-deps-dev
@@ -21,31 +20,32 @@ uv run --locked template-python --help
 make test
 ```
 
-`.venv` は uv が管理します。別の `pip install` でプロジェクトの依存関係を
-導入したり、仮想環境を有効化したりする必要はありません。
-`make install-deps-dev` が表示する actionlint の案内は、Python テストの実行を
-妨げません。
+`.venv` は `uv` が管理します。依存関係を別途 `pip install` でインストールしないで
+ください。仮想環境の有効化も不要です。Ruff、mypy、actionlint、zizmor、pip-audit は
+`uv.lock` からインストールされるため、グローバルなツールは不要です。
 
-Git hook を使う場合だけ、次を実行します。
+Git フックを一度インストールします。
 
 ```shell
 make install-hooks
 make hooks-check
 ```
 
-Hook は YAML、空白、Ruff のルールを確認します。型検査、テスト、全品質ゲートの
-代わりにはなりません。
+フックはファイルの整形確認、秘密鍵とシークレットの検出（gitleaks）、
+`uv lock --check`、Ruff、mypy、actionlint、zizmor を実行します。Python ツールは
+`uv run --locked` 経由で動くため、フックと CI のバージョンは常に一致します。
+フックはテストを実行しないので、push 前に `make ci-test` を実行してください。
 
-## 日常の開発
+## 日々の開発 { #everyday-development }
 
 1. [変更箇所の早見表](architecture/README.ja.md#where-to-change-code)で、
-   変更するモジュールとテストを特定します。
-2. 期待する出力と失敗時の振る舞いを、小さなテストで定義します。
-3. その契約を満たす最も単純な変更を実装します。
-4. 対象のテストを実行し、整形と変更範囲に合う検証を行います。
-5. 振る舞いが変わる場合は、対応する英語と日本語の説明を更新します。
+   対象モジュールと対応するテストを確認します。
+2. 期待する出力と失敗時の動作を、対象を絞ったテストで定義します。
+3. その契約を満たす最小限の変更を実装します。
+4. 対象テスト、整形、変更した領域の検証を順に実行します。
+5. 動作を変更した場合は、関連する英語と日本語のドキュメントを更新します。
 
-挨拶や CLI を変更する場合の例です。
+挨拶や CLI を変更する場合は、次のコマンドから始めます。
 
 ```shell
 uv run --locked pytest --no-cov tests/test_core.py tests/test_cli.py
@@ -53,120 +53,143 @@ make fix
 make ci-test
 ```
 
-`--no-cov` は対象を絞った反復作業だけに使います。一部のテストでパッケージ全体の
-カバレッジを測ると、変更とは無関係な不足で失敗するためです。
-`make test` と `make ci-test` は全テストと branch coverage を実行し、
-**95% 以上**を要求します。一部のテストを通すために閾値を下げないでください。
+`--no-cov` は、対象を絞った確認のためだけに使います。一部のテストだけで
+パッケージ全体のカバレッジ基準を測ると、誤った失敗になるためです。
+`make test` と `make ci-test` は全テストを分岐カバレッジ付きで実行し、
+**95%** 以上を要求します（テンプレート自体は 100%）。pytest は strict モードで動き、
+警告をエラーとして扱います。通すためだけに基準を下げたり、警告を広く無視したり
+しないでください。
 
-<a id="checks-by-change-type"></a>
+テストは一時的な作業ディレクトリで、`PROJECT_*` 変数を取り除いた状態で実行されます
+（`tests/conftest.py` を参照）。手元のシェルや `.env` は結果に影響しません。
 
-### 変更内容に応じた検証
+### 変更内容ごとの検証 { #checks-by-change-type }
 
-| 変更対象 | 作業中の確認 | 提出前の検証 |
+| 変更した領域 | 素早い確認 | 提出前 |
 | --- | --- | --- |
-| Python の処理・テスト | `--no-cov` 付きの対象テスト、`make fix`、`make type-check` | `make ci-test` |
-| 依存関係・パッケージ情報 | `uv lock`、`make package-check` | `make ci-test`。影響する場合は docs・コンテナも検証 |
-| Markdown・`mkdocs.yml` | `make docs-serve` | `make ci-test-docs` |
-| GitHub Workflow | `actionlint` | `make ci-test` と、その Workflow が呼ぶ検証 |
-| Dockerfile・Compose | `make docker-build docker-run` | `make ci-test-docker`。Compose 変更時は `docker compose up --build` も実行 |
+| Python の動作やテスト | 対象テストを `--no-cov` 付きで実行、`make fix`、`make type-check` | `make ci-test` |
+| 依存関係やパッケージ情報 | `uv lock`、`make package-check` | `make ci-test`、`make audit`、`make test-lowest` |
+| Markdown や `mkdocs.yml` | `make docs-serve` | `make ci-test-docs` |
+| GitHub ワークフローや Dependabot | `uv run --locked actionlint`、`uv run --locked zizmor --offline .` | `make ci-test` |
+| Dockerfile や Compose | `make docker-build docker-run` | `make ci-test-docker`。Compose を変更した場合は `docker compose up --build` も実行 |
 
-複数の領域を変更したら、該当する検証をすべて行います。ドキュメントだけの変更で
-Python やコンテナの品質ゲートを実行する必要はありません。
+複数の領域にまたがる場合は、該当する検証をすべて実行します。
 
-新しい手順を覚える代わりに、既存コマンドを使います。
-
-| コマンド | 実行すること |
+| コマンド | 内容 |
 | --- | --- |
-| `make help` | 利用できる Make target の一覧表示 |
-| `make fix` | Ruff による自動修正と整形。自動変更の内容は確認する |
-| `make lint` | mypy strict、Ruff、actionlint、オフラインの zizmor |
-| `make test` | branch coverage 付きの pytest |
-| `make package-check` | wheel と sdist をビルドし、wheel の CLI とモジュール起動を隔離環境で確認 |
-| `make ci-test` | dev 依存関係の同期、整形確認、Lint、テスト、配布物検証 |
-
-CI は Python 3.13 で全品質ゲートと docs ビルド、3.12 と 3.14 で互換性テスト、
-別の job で hook の検証を行います。
-
-<a id="configuration"></a>
-
-## 設定リファレンス
-
-CLI は既定値で動作します。ローカル設定を変更する場合だけ、
+| `make help` | 利用できる Make ターゲットを表示 |
+| `make fix` | Ruff の自動修正と整形を適用。変更内容は確認する |
+| `make lint` | strict な mypy、Ruff（セキュリティルールを含む）、actionlint、zizmor を実行 |
+| `make test` | 分岐カバレッジ付きで pytest を実行 |
+| `make test-lowest` | Python 3.12 と、宣言した直接依存の下限バージョンでテスト |
+| `make package-check` | wheel と sdist をビルドし、インストール後の CLI、モジュール実行、`--version` を確認 |
+| `make ci-test` | 開発用依存関係を同期し、整形、Lint、テスト、パッケージ検証を実行 |
+| `make audit` | ロック済みの全依存関係を pip-audit で監査（ハッシュ検証、pip 不使用） |
+| `make secret-scan` | gitleaks で Git 履歴全体をスキャン（Docker） |
+| `make security-scan` | Trivy で脆弱な依存関係、設定ミス、シークレットをスキャン（Docker） |
+| `make ci-test-security` | `audit`、`secret-scan`、`security-scan` を実行 |
+
+CI は Python 3.14 で全検証とドキュメントのビルドを行い、3.12・3.13・3.15 の互換性
+テスト、下限依存のジョブ、フックを別ジョブで実行します。セキュリティスキャンは
+プルリクエストと毎週実行されます。詳細は
+[セキュリティとサプライチェーン](architecture/README.ja.md#security-and-supply-chain)
+を参照してください。
+
+## 設定 { #configuration }
+
+CLI は既定値だけで動作します。ローカルで値を変更する場合のみ、
 `.env.template` を `.env` にコピーします。
 
 ```shell
 cp .env.template .env
 ```
 
-| 環境変数 | 既定値 | 許容値・影響 |
+| 変数 | 既定値 | 指定できる値と効果 |
 | --- | --- | --- |
-| `PROJECT_NAME` | `template-python` | 起動時の debug ログに使う文字列。挨拶の出力は変わらない |
+| `PROJECT_NAME` | `template-python` | デバッグ用の起動ログに表示する文字列。挨拶文は変わりません |
 | `PROJECT_LOG_LEVEL` | `INFO` | `DEBUG`、`INFO`、`WARNING`、`ERROR`、`CRITICAL` |
+| `PROJECT_LOG_FORMAT` | `text` | 人が読む `text`、または 1 行 1 JSON オブジェクトの `json`（ログ収集基盤やコンテナ向け） |
 
-優先順位は、環境変数、`.env`、既定値の順です。変数名の大文字・小文字は区別
-しませんが、ログレベルの**値**は上記の大文字表記にします。
-`.env` は作業ディレクトリから読み、未知の項目は拒否します。別のアプリケーションの
-`.env` を流用しないでください。ローカル設定や秘密情報はコミットしません。
+優先順位は、環境変数、`.env`、既定値の順です。
+変数名の大文字と小文字は区別しませんが、**値**は上記の選択肢と完全に一致させてください。
+`.env` は作業ディレクトリから読み込まれ、未知の `PROJECT_*` 項目はエラーになります。
+別のアプリケーションの `.env` は再利用しないでください。ローカル設定やシークレットは
+バージョン管理に含めないでください。
 
 ```shell
 PROJECT_LOG_LEVEL=DEBUG uv run --locked template-python hello --name Ada
-uv run --locked template-python --verbose hello --name Ada
+PROJECT_LOG_FORMAT=json uv run --locked template-python --verbose hello
+uv run --locked template-python config
 ```
 
-`--verbose` はグローバルオプションなので、`hello` の前に置きます。
-設定を検証した後で debug ログを有効にするため、不正な設定を回避する用途には
-使えません。正常な挨拶は stdout、ログと検証エラーは stderr に出力します。
-空白だけの `--name` と不正な設定は、終了コード **2** で失敗します。
+`config` は有効な設定を JSON で出力します。認証情報は `pydantic.SecretStr` で宣言
+してください。値は `**********` と表示されます。
 
-## 依存関係
-
-- `pyproject.toml` の依存宣言を編集し、`uv lock` を実行して両方のファイルを
-  コミットします。解決済みの lock エントリを手で編集しません。
-- `make update` は全体の更新を意図した場合だけ使います。既存バージョンの同期では
-  なく、`uv lock --upgrade` を実行するコマンドです。
-- 実行時の依存関係は `project.dependencies`、開発・テスト・docs・Notebook の
-  ツールは既存の各グループへ追加します。
-- 既存コマンドは必要な依存グループを選んで同期します。docs と Notebook は
-  `--no-dev` を使い、その後の dev コマンドで必要な dev グループが再び同期されます。
-
-<a id="documentation"></a>
-
-## ドキュメントの開発
+| グローバルオプション | 効果 |
+| --- | --- |
+| `--verbose`、`-v` | 設定の検証後にデバッグログを選択。不正な設定を有効にはしません |
+| `--version`、`-V` | `template-python <version>` を表示して終了。設定が不正でも動作します |
+| `--help` | ヘルプを表示。コマンドなしで実行した場合もヘルプを表示（終了コード 2） |
+
+グローバルオプションはコマンドより前に指定します（`template-python --verbose hello`）。
+コマンドの出力は標準出力へ、ログと検証エラーは標準エラー出力へ書き込まれます。
+空白だけの `--name` や不正な設定は、終了コード **2** で終了します。
+
+## 依存関係 { #dependencies }
+
+- 依存関係の宣言は `pyproject.toml` で変更し、`uv lock` を実行してから、
+  マニフェストと `uv.lock` の両方をコミットします。ロックファイルの解決結果は
+  手作業で編集しないでください。
+- 下限バージョンを正しく保ちます。`make test-lowest` は直接依存の下限バージョンを
+  インストールし、成功する必要があります。
+- `make update` は、意図的に依存関係を広く更新する場合だけ使います。
+  現在のバージョンを同期するのではなく、`uv lock --upgrade` を実行します。
+  実行後は `make audit` を実行してください。
+- 実行時の依存関係は `project.dependencies` に置き、開発、テスト、ドキュメント、
+  Notebook 用のツールは既存のグループに置きます。
+- Dependabot は Python パッケージ、GitHub Actions、pre-commit フック、Docker の
+  ベースイメージ、Dev Container の feature について、7 日間のクールダウン後に
+  グループ化した更新を毎週作成します。`Makefile` のツールイメージと
+  Dev Container の uv バージョンは手動で固定しています。uv を上げる場合は
+  `[tool.uv] required-version` と合わせて更新してください。
+
+## ドキュメント { #documentation }
 
 ```shell
 make docs-serve
 ```
 
-MkDocs が表示する URL（通常は `http://127.0.0.1:8000`）を開きます。
-`Ctrl+C` でプレビューを終了し、次のコマンドで検証します。
+MkDocs が表示するアドレス（通常は `http://127.0.0.1:8000`）を開きます。
+`Ctrl+C` でプレビューを止めてから、次のコマンドで検証します。
 
 ```shell
 make ci-test-docs
 ```
 
-英語と日本語の出力は、Git 管理対象外の `site/` に生成されます。
-`page.md` と `page.ja.md` は一緒に編集してください。ページを追加するときは
-`mkdocs.yml` のナビゲーションと日本語のラベルも追加します。
-ドキュメント同士は相対リンクにします。README は導入、このページは手順、
-エンジニアリングガイドは設計理由を担当します。
-
-<a id="troubleshooting"></a>
+ビルドは strict モードで実行され、英語と日本語のページを Git の管理対象外である
+`site/` に出力します。`page.md` と `page.ja.md` は一緒に編集します。他のページから
+リンクされる見出しには `## 見出し { #heading }` のように明示的な ID を付け、
+両言語でアンカーを共有します。新しいページは日本語のナビゲーション名も含めて
+`mkdocs.yml` に追加し、ドキュメント間のリンクには相対パスを使います。導入手順は
+README、作業手順はこのガイド、設計理由はエンジニアリングガイドに置きます。
 
-## トラブルシューティング
+## トラブルシューティング { #troubleshooting }
 
-検証を無効にしたり、複数のツールを一度に変更したりせず、最初に失敗した
-コマンドから原因を確認します。
+検証を無効化したり、複数のツールを同時に変更したりせず、最初に失敗したコマンドから
+修正します。
 
-| 症状 | 確認すること・次の行動 |
+| 症状 | 確認すること / 次の対応 |
 | --- | --- |
-| `uv: command not found` | 指定バージョンの uv を導入し、`PATH` と `uv --version` を確認する |
-| Python のバージョンが合わない | 例として `uv sync --locked --group dev --python 3.13` で対応 interpreter を選ぶ |
-| Lint・CI で `actionlint: command not found` | actionlint を導入して `actionlint --version` を確認する。対象の確認には `make test` を使える |
-| lock の更新が必要と表示される | 意図した依存変更なら `uv lock` で両方を更新する。それ以外は `--locked` を外さず宣言と lock のずれを調べる |
-| `Invalid configuration`・終了コード 2 | `PROJECT_*` と作業ディレクトリの `.env` を確認し、大文字の許容ログレベルを使う |
-| 対象テストだけの実行でカバレッジ不足 | 対象を絞る間は `--no-cov`、実際の品質ゲートには `make test` を使う |
-| Docker daemon に接続できない | Docker を起動して再実行する。Python だけの作業ならコンテナ環境は不要 |
-| ページが表示されない・リンクが切れている | `mkdocs.yml`、英日のファイル、リンク先を確認し、両言語を再ビルドする |
-
-相談するときは、実行コマンド、最初のエラー、OS、Python・uv のバージョン、
-関連する変更を添えます。秘密情報や非公開の設定は伏せてください。
+| `uv: command not found` | uv 0.13.x をインストールし、`PATH` に含まれることを `uv --version` で確認 |
+| `Required uv version ... does not match` | `[tool.uv] required-version` の範囲に uv を合わせる（例: `uv self update`） |
+| Python のバージョンが合わない | サポート対象のインタープリターを指定。例: `uv sync --locked --group dev --python 3.13` |
+| ロックファイルの更新が必要と表示される | 意図した依存関係の変更なら `uv lock` を実行して両方を確認。そうでなければ `--locked` を外さず差異の原因を調べる |
+| `make audit` が脆弱性を報告する | パッケージを更新（`uv lock --upgrade-package <name>`）して再実行。ID を無視する場合は理由を記録する |
+| `make test-lowest` が失敗する | `pyproject.toml` の下限を動作する最初のバージョンへ上げてから `uv lock` |
+| `Invalid configuration` / 終了コード 2 | `PROJECT_*` 変数と作業ディレクトリの `.env` を確認し、指定できる値を使う |
+| 一部のテストでカバレッジ基準を満たせない | その場合は `--no-cov` を使い、正式なカバレッジ判定は `make test` で行う |
+| Docker デーモンに接続できない | Docker を起動してから再実行。コンテナとスキャンのターゲット以外では不要 |
+| 新しいページが表示されない、またはリンク切れになる | `mkdocs.yml`、両言語のファイル、見出し ID、リンク先を確認して再ビルド |
+
+問い合わせる際は、実行したコマンド、最初のエラー、OS、Python と uv のバージョン、
+関連する変更を記載してください。シークレットや非公開の設定は伏せてください。
diff --git a/docs/development.md b/docs/development.md
index 85422d6..515f5d5 100644
--- a/docs/development.md
+++ b/docs/development.md
@@ -5,15 +5,14 @@ For module boundaries and design decisions, use the
 [engineering guide](architecture/README.md).
 All commands below run from the repository root.
 
-## Set up once
+## Set up once { #set-up-once }
 
 | Tool | When it is needed |
 | --- | --- |
-| Python 3.12+ | Package and tests; prefer 3.13 to match the full CI job |
-| [uv 0.12.19](https://docs.astral.sh/uv/getting-started/installation/) | Locked dependencies and command execution |
+| [uv 0.13.x](https://docs.astral.sh/uv/getting-started/installation/) | Always; `pyproject.toml` requires `>=0.13.1,<0.14` |
+| Python 3.12–3.15 | Installed by uv on demand; `.python-version` selects 3.14 |
 | GNU Make | The repository's standard commands |
-| [actionlint](https://github.com/rhysd/actionlint/blob/main/docs/install.md) | `make lint` and `make ci-test`; CI uses 1.7.12 |
-| Docker with a running daemon | Container commands only |
+| Docker with a running daemon | Container checks, `secret-scan`, and `security-scan` only |
 
 ```shell
 make install-deps-dev
@@ -22,20 +21,22 @@ make test
 ```
 
 `uv` manages `.venv`; do not install project dependencies with a separate
-`pip install` command. No activation is needed. The actionlint reminder printed
-by `make install-deps-dev` does not prevent Python tests from running.
+`pip install` command. No activation is needed. Ruff, mypy, actionlint, zizmor,
+and pip-audit are installed from `uv.lock`, so no global tools are required.
 
-Optional Git hooks:
+Install the Git hooks once:
 
 ```shell
 make install-hooks
 make hooks-check
 ```
 
-Hooks check YAML, whitespace, and Ruff rules. They do not replace type checking,
-tests, or the full quality gate.
+Hooks run file hygiene checks, private-key and secret detection (gitleaks),
+`uv lock --check`, Ruff, mypy, actionlint, and zizmor. Python tools run through
+`uv run --locked`, so hooks and CI use identical versions. Hooks do not run the
+tests; use `make ci-test` before pushing.
 
-## Everyday development
+## Everyday development { #everyday-development }
 
 1. Find the module and its test using the
    [change map](architecture/README.md#where-to-change-code).
@@ -54,37 +55,46 @@ make ci-test
 
 `--no-cov` is only for the focused feedback loop: measuring a subset against the
 whole-package coverage threshold would give misleading failures. `make test`
-and `make ci-test` run all tests with branch coverage and enforce **95%** minimum
-coverage. Do not lower the threshold to make a focused run pass.
+and `make ci-test` run all tests with branch coverage and enforce at least
+**95%** (the template itself is at 100%). pytest runs in strict mode and turns
+warnings into errors. Do not lower the threshold or ignore warnings broadly to
+make a run pass.
 
-### Checks by change type
+Tests run in an isolated temporary working directory with `PROJECT_*` variables
+removed (see `tests/conftest.py`), so your shell and `.env` do not affect results.
+
+### Checks by change type { #checks-by-change-type }
 
 | Changed area | Focused feedback | Before submitting |
 | --- | --- | --- |
 | Python behavior or tests | Selected tests with `--no-cov`, `make fix`, `make type-check` | `make ci-test` |
-| Dependencies or package metadata | `uv lock`, `make package-check` | `make ci-test`; docs/container checks if affected |
+| Dependencies or package metadata | `uv lock`, `make package-check` | `make ci-test`, `make audit`, `make test-lowest` |
 | Markdown or `mkdocs.yml` | `make docs-serve` | `make ci-test-docs` |
-| GitHub workflows | `actionlint` | `make ci-test` and the checks invoked by the changed workflow |
+| GitHub workflows or Dependabot | `uv run --locked actionlint`, `uv run --locked zizmor --offline .` | `make ci-test` |
 | Dockerfile or Compose | `make docker-build docker-run` | `make ci-test-docker`; `docker compose up --build` if Compose changed |
 
-Run the union of checks when a change spans areas. Documentation-only changes
-do not need the Python or container gate.
-
-Useful commands, without a new workflow to memorize:
+Run the union of checks when a change spans areas.
 
 | Command | What it does |
 | --- | --- |
 | `make help` | Lists supported Make targets |
 | `make fix` | Applies Ruff fixes and formatting; review any automatic changes |
-| `make lint` | Runs strict mypy, Ruff, actionlint, and offline zizmor |
+| `make lint` | Runs strict mypy, Ruff (including security rules), actionlint, and zizmor |
 | `make test` | Runs pytest with branch coverage |
-| `make package-check` | Builds wheel and sdist, then tests the wheel's installed CLI and module entry point in isolation |
+| `make test-lowest` | Runs tests on Python 3.12 with the lowest declared direct dependency versions |
+| `make package-check` | Builds wheel and sdist, then tests the installed CLI, module entry point, and `--version` |
 | `make ci-test` | Syncs dev dependencies and runs formatting, lint, tests, and package checks |
+| `make audit` | Audits every locked dependency with pip-audit (hash-verified, no pip) |
+| `make secret-scan` | Scans the full Git history with gitleaks (Docker) |
+| `make security-scan` | Scans files with Trivy for vulnerable dependencies, misconfigurations, and secrets (Docker) |
+| `make ci-test-security` | Runs `audit`, `secret-scan`, and `security-scan` |
 
-CI runs the full gate and docs build on Python 3.13, compatibility tests on
-3.12 and 3.14, and hooks in a separate job.
+CI runs the full gate and docs build on Python 3.14, compatibility tests on
+3.12, 3.13, and 3.15, the lowest-dependency job, and hooks in separate jobs.
+Security scans run on pull requests and weekly; see
+[security and supply chain](architecture/README.md#security-and-supply-chain).
 
-## Configuration
+## Configuration { #configuration }
 
 The CLI works with defaults. Copy `.env.template` to `.env` only if local
 overrides are needed:
@@ -97,35 +107,51 @@ cp .env.template .env
 | --- | --- | --- |
 | `PROJECT_NAME` | `template-python` | String used in the debug startup log; does not change the greeting |
 | `PROJECT_LOG_LEVEL` | `INFO` | `DEBUG`, `INFO`, `WARNING`, `ERROR`, or `CRITICAL` |
+| `PROJECT_LOG_FORMAT` | `text` | `text` for humans, `json` for one JSON object per line (log collectors, containers) |
 
 Environment variables override `.env`, which overrides defaults.
-Names are case-insensitive; log-level **values** must use the uppercase choices
-above. `.env` is read from the working directory and unknown entries are
+Names are case-insensitive; **values** must use the exact choices above. `.env`
+is read from the working directory and unknown `PROJECT_*` entries are
 rejected, so do not reuse an unrelated application's `.env`.
 Keep local settings and secrets out of version control.
 
 ```shell
 PROJECT_LOG_LEVEL=DEBUG uv run --locked template-python hello --name Ada
-uv run --locked template-python --verbose hello --name Ada
+PROJECT_LOG_FORMAT=json uv run --locked template-python --verbose hello
+uv run --locked template-python config
 ```
 
-`--verbose` is a global option: place it before `hello`. It selects debug logging
-after settings validation; it cannot make an invalid setting valid.
-Successful greeting output goes to stdout; logs and validation errors go to
-stderr. Blank `--name` values and invalid settings exit with code **2**.
+`config` prints the effective settings as JSON. Declare credentials as
+`pydantic.SecretStr`; they are printed as `**********`.
+
+| Global option | Effect |
+| --- | --- |
+| `--verbose`, `-v` | Selects debug logging after settings validation; it cannot make an invalid setting valid |
+| `--version`, `-V` | Prints `template-python <version>` and exits, even if settings are invalid |
+| `--help` | Shows help; running without a command also shows help (exit code 2) |
+
+Place global options before the command (`template-python --verbose hello`).
+Command output goes to stdout; logs and validation errors go to stderr. Blank
+`--name` values and invalid settings exit with code **2**.
 
-## Dependencies
+## Dependencies { #dependencies }
 
 - Edit dependency declarations in `pyproject.toml`, run `uv lock`, and commit both
   the manifest and `uv.lock`. Do not hand-edit resolved lock entries.
+- Keep lower bounds honest: `make test-lowest` installs the lowest allowed direct
+  dependency versions and must pass.
 - Use `make update` only for an intentional broad upgrade: it runs
-  `uv lock --upgrade`, not just a sync of the current versions.
+  `uv lock --upgrade`, not just a sync of the current versions. Run `make audit`
+  afterwards.
 - Keep runtime dependencies in `project.dependencies`; keep development,
   test, docs, and notebook tools in their existing groups.
-- Existing commands select and sync their dependency groups. Docs and notebook
-  commands use `--no-dev`; a later dev command restores the dev group as needed.
+- Dependabot opens grouped weekly updates after a 7-day cooldown for Python
+  packages, GitHub Actions, pre-commit hooks, Docker base images, and Dev
+  Container features. Tool images in the `Makefile` and the uv version in the Dev
+  Container are pinned by hand; update them together with `[tool.uv]
+  required-version` when raising uv.
 
-## Documentation
+## Documentation { #documentation }
 
 ```shell
 make docs-serve
@@ -138,27 +164,31 @@ preview with `Ctrl+C`, then validate with:
 make ci-test-docs
 ```
 
-The build writes English and Japanese pages to the ignored `site/` directory.
-Edit `page.md` and `page.ja.md` together. Add new pages to `mkdocs.yml`, including
-Japanese navigation labels. Use relative links between documentation pages.
-Keep onboarding in the README, procedures here, and design rationale in the
-engineering guide.
+The build runs in strict mode and writes English and Japanese pages to the
+ignored `site/` directory. Edit `page.md` and `page.ja.md` together. Give
+headings that are linked from other pages an explicit ID such as
+`## Heading { #heading }` so both languages share anchors. Add new pages to
+`mkdocs.yml`, including Japanese navigation labels. Use relative links between
+documentation pages. Keep onboarding in the README, procedures here, and design
+rationale in the engineering guide.
 
-## Troubleshooting
+## Troubleshooting { #troubleshooting }
 
 Fix the first failing command rather than disabling checks or changing several
 tools at once.
 
 | Symptom | What to check / next action |
 | --- | --- |
-| `uv: command not found` | Install the pinned uv version and ensure its directory is on `PATH`; confirm with `uv --version` |
+| `uv: command not found` | Install uv 0.13.x and ensure its directory is on `PATH`; confirm with `uv --version` |
+| `Required uv version ... does not match` | Upgrade or downgrade uv into the range in `[tool.uv] required-version` (for example `uv self update`) |
 | Python version is incompatible | Select a supported interpreter, for example `uv sync --locked --group dev --python 3.13` |
-| `actionlint: command not found` during lint/CI | Install actionlint and confirm `actionlint --version`; `make test` remains available for focused work |
 | Lock file needs updating | If dependencies intentionally changed, run `uv lock` and review both files; otherwise investigate manifest/lock drift rather than removing `--locked` |
-| `Invalid configuration` / exit code 2 | Check `PROJECT_*` variables and the working directory's `.env`; use an accepted uppercase log level |
+| `make audit` reports a vulnerability | Upgrade the package (`uv lock --upgrade-package <name>`) and rerun; only ignore an ID with a documented reason |
+| `make test-lowest` fails | Raise the lower bound in `pyproject.toml` to the first version that works, then `uv lock` |
+| `Invalid configuration` / exit code 2 | Check `PROJECT_*` variables and the working directory's `.env`; use an accepted value |
 | A selected test run fails coverage | Use `--no-cov` for the subset, then run `make test` for the actual coverage gate |
-| Docker cannot connect to the daemon | Start Docker before retrying; container tooling is not needed for Python-only work |
-| A new page is absent or a link is broken | Check `mkdocs.yml`, both language files, and the link target, then rebuild both languages |
+| Docker cannot connect to the daemon | Start Docker before retrying; it is only needed for container and scan targets |
+| A new page is absent or a link is broken | Check `mkdocs.yml`, both language files, heading IDs, and the link target, then rebuild |
 
 When requesting help, include the exact command, first failure, OS, Python/uv
 versions, and relevant change. Redact secrets and private configuration.
diff --git a/docs/index.ja.md b/docs/index.ja.md
index 85e1e35..85f661f 100644
--- a/docs/index.ja.md
+++ b/docs/index.ja.md
@@ -1,13 +1,14 @@
 # template-python
 
-Python 3.12+ 向けの、型付きパッケージ兼 CLI テンプレートです。まずサンプルを
-動かし、その後は目的に合うガイドだけを読んでください。コンテナ、Notebook、
-デプロイは任意であり、開発を始めるための前提ではありません。
+Python 3.12+ 向けの、型付き CLI テンプレートです。本番運用に耐えるツールチェーンを
+備えています。まずサンプルを動かし、その後は目的に合うガイドだけを読んでください。
+コンテナ、Notebook、デプロイは任意であり、開発を始めるための前提ではありません。
 
 ## まず動かす
 
-[uv 0.12.19](https://docs.astral.sh/uv/getting-started/installation/)、
-Python 3.12+、GNU Make を用意し、リポジトリのルートで実行します。
+[uv 0.13.x](https://docs.astral.sh/uv/getting-started/installation/) と GNU Make を
+用意します。Python 3.14 は `.python-version` に従って uv が導入します。
+リポジトリのルートで実行します。
 
 ```shell
 make install-deps-dev
@@ -21,8 +22,9 @@ CLI の出力は次のとおりです。
 Hello, Ada!
 ```
 
-`.env` の作成や仮想環境の有効化は不要です。CI の全検証は Python 3.13 で行い、
-3.12 と 3.14 でも互換性テストを実行します。
+`.env` の作成や仮想環境の有効化は不要です。CI の全検証は Python 3.14 で行い、
+3.12・3.13・3.15 でも互換性テストを実行します。宣言した依存関係の下限バージョンも
+3.12 でテストします。
 
 ## 目的から探す
 
@@ -31,6 +33,7 @@ Hello, Ada!
 | 開発環境を用意し、コードを変更・検証する | [開発ガイド](development.ja.md) |
 | 変更するモジュールや設計方針を判断する | [アーキテクチャとエンジニアリング](architecture/README.ja.md) |
 | 環境変数を設定し、CLI のエラーを理解する | [設定リファレンス](development.ja.md#configuration) |
+| スキャナー、CI、リリースの仕組みを理解する | [セキュリティとサプライチェーン](architecture/README.ja.md#security-and-supply-chain) |
 | コマンドの失敗から復旧する | [トラブルシューティング](development.ja.md#troubleshooting) |
 | テンプレートを改名し、不要な機能を外す | [テンプレートの導入](architecture/README.ja.md#adopting-the-template) |
 | ドキュメントをプレビュー・検証する | [ドキュメントの開発](development.ja.md#documentation) |
@@ -39,7 +42,8 @@ Hello, Ada!
 
 - 再利用する処理はコアへ、設定・ログ・表示・終了コードは CLI へ置きます。
 - コマンドの正本は `Makefile` です。ツールのオプションを覚える代わりに
-  `make help` を使います。
-- 依存関係の宣言は `pyproject.toml`、解決済みバージョンは `uv.lock` が管理します。
+  `make help` を使います。CI も同じターゲットを呼びます。
+- 依存関係とツール設定の宣言は `pyproject.toml`、解決済みバージョンは `uv.lock` が
+  管理します。Git フックが使うリンターも `uv.lock` に含まれます。
 - 英語と日本語のページを揃えます。詳細な手順を README に重複させず、
   該当するガイドへリンクします。
diff --git a/docs/index.md b/docs/index.md
index c391fd2..eb02267 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -1,13 +1,14 @@
 # template-python
 
-A typed Python 3.12+ package and CLI template. Start with the runnable example,
-then read only the guide needed for your task. Containers, notebooks, and
-deployment are optional, not prerequisites.
+A typed Python 3.12+ CLI template with a production-grade toolchain. Start with
+the runnable example, then read only the guide needed for your task. Containers,
+notebooks, and deployment are optional, not prerequisites.
 
 ## Run the example
 
-Install [uv 0.12.19](https://docs.astral.sh/uv/getting-started/installation/),
-Python 3.12+, and GNU Make. Run these commands from the repository root:
+Install [uv 0.13.x](https://docs.astral.sh/uv/getting-started/installation/)
+and GNU Make. uv installs Python 3.14 from `.python-version`. Run these commands
+from the repository root:
 
 ```shell
 make install-deps-dev
@@ -21,8 +22,9 @@ The CLI prints:
 Hello, Ada!
 ```
 
-No `.env` file or virtual environment activation is required. Python 3.13 is the
-full CI baseline; 3.12 and 3.14 also have compatibility tests.
+No `.env` file or virtual environment activation is required. Python 3.14 is the
+full CI baseline; 3.12, 3.13, and 3.15 also have compatibility tests, and the
+lowest declared dependency versions are tested on 3.12.
 
 ## Find the next step
 
@@ -31,6 +33,7 @@ full CI baseline; 3.12 and 3.14 also have compatibility tests.
 | Set up development, change code, and select checks | [Development](development.md) |
 | Find the right module or make a design decision | [Architecture and engineering](architecture/README.md) |
 | Set environment variables or understand CLI errors | [Configuration](development.md#configuration) |
+| Understand scanners, CI, and releases | [Security and supply chain](architecture/README.md#security-and-supply-chain) |
 | Recover from a failed command | [Troubleshooting](development.md#troubleshooting) |
 | Rename the template or remove unused assets | [Adopting the template](architecture/README.md#adopting-the-template) |
 | Preview and validate these pages | [Documentation workflow](development.md#documentation) |
@@ -40,7 +43,8 @@ full CI baseline; 3.12 and 3.14 also have compatibility tests.
 - Reusable behavior belongs in the core; the CLI handles settings, logging,
   output, and exit codes.
 - `Makefile` is the command reference; use `make help` rather than memorizing
-  tool flags.
-- `pyproject.toml` declares dependencies; `uv.lock` records resolved versions.
+  tool flags. CI calls the same targets.
+- `pyproject.toml` declares dependencies and tool settings; `uv.lock` records
+  resolved versions, including the linters used by Git hooks.
 - Keep English and Japanese pages aligned. Do not duplicate detailed procedures
   in the README; link to the relevant guide instead.
diff --git a/mkdocs.yml b/mkdocs.yml
index 682ca33..9e62ba1 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -27,6 +27,14 @@ theme:
         name: Switch to system preference
   icon:
     repo: fontawesome/brands/github
+markdown_extensions:
+  - attr_list
+  - admonition
+  - tables
+  - toc:
+      permalink: true
+validation:
+  anchors: warn
 plugins:
   - i18n:
       docs_structure: suffix
diff --git a/pyproject.toml b/pyproject.toml
index f1acf21..658f485 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,23 +1,27 @@
 [project]
 name = "template-python"
 version = "0.0.13"
-description = "A minimal, typed Python package and CLI template"
+description = "A minimal, typed Python CLI template with a production-grade toolchain"
 readme = "README.md"
 requires-python = ">=3.12"
 license = "MIT"
 license-files = ["LICENSE"]
-keywords = ["python", "template", "typer", "uv"]
+authors = [{ name = "ks6088ts" }]
+keywords = ["cli", "python", "template", "typer", "uv"]
 classifiers = [
     "Development Status :: 3 - Alpha",
     "Environment :: Console",
-    "License :: OSI Approved :: MIT License",
+    "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3 :: Only",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3.14",
+    "Programming Language :: Python :: 3.15",
     "Typing :: Typed",
 ]
 dependencies = [
+    "pydantic>=2.12,<3",
     "pydantic-settings>=2.15,<3",
     "typer>=0.27,<1",
 ]
@@ -42,7 +46,9 @@ test = [
 ]
 dev = [
     { include-group = "test" },
+    "actionlint-py>=1.7.12,<2",
     "mypy>=2.4,<3",
+    "pip-audit>=2.10,<3",
     "prek>=0.5.4,<0.6",
     "ruff>=0.17.1,<0.18",
     "zizmor>=1.30.1,<2",
@@ -55,27 +61,75 @@ notebook = [
 requires = ["uv_build>=0.13,<0.14"]
 build-backend = "uv_build"
 
+[tool.uv]
+required-version = ">=0.13.1,<0.14"
+
 [tool.ruff]
 line-length = 120
 target-version = "py312"
 
 [tool.ruff.lint]
-select = ["B", "E", "F", "I", "PT", "RUF", "SIM", "UP"]
+select = [
+    "A",     # flake8-builtins
+    "ARG",   # flake8-unused-arguments
+    "B",     # flake8-bugbear
+    "BLE",   # flake8-blind-except
+    "C4",    # flake8-comprehensions
+    "DTZ",   # flake8-datetimez
+    "E",     # pycodestyle errors
+    "ERA",   # eradicate (commented-out code)
+    "F",     # pyflakes
+    "FBT",   # flake8-boolean-trap
+    "FURB",  # refurb
+    "G",     # flake8-logging-format
+    "I",     # isort
+    "LOG",   # flake8-logging
+    "N",     # pep8-naming
+    "PERF",  # perflint
+    "PIE",   # flake8-pie
+    "PL",    # pylint
+    "PT",    # flake8-pytest-style
+    "PTH",   # flake8-use-pathlib
+    "RET",   # flake8-return
+    "RUF",   # ruff-specific
+    "S",     # flake8-bandit (security)
+    "SIM",   # flake8-simplify
+    "T20",   # flake8-print
+    "TRY",   # tryceratops
+    "UP",    # pyupgrade
+    "W",     # pycodestyle warnings
+]
+
+[tool.ruff.lint.per-file-ignores]
+# Typer declares boolean flags as keyword parameters with defaults.
+"src/template_python/cli.py" = ["FBT001", "FBT002"]
+"tests/**" = ["PLR2004", "S101"]
 
-[tool.pytest.ini_options]
-addopts = "-ra --cov=src/template_python"
+[tool.pytest]
+minversion = "9.0"
+addopts = ["-ra", "--cov", "--cov-report=term-missing"]
+strict = true
 testpaths = ["tests"]
+filterwarnings = ["error"]
 
 [tool.coverage.run]
 branch = true
+source_pkgs = ["template_python"]
 
 [tool.coverage.report]
 fail_under = 95
 show_missing = true
+partial_also = ['if __name__ == "__main__":']
 
 [tool.mypy]
 files = ["src", "tests"]
 python_version = "3.12"
 strict = true
-show_error_codes = true
+warn_unreachable = true
+enable_error_code = ["ignore-without-code", "redundant-expr", "truthy-bool"]
 plugins = ["pydantic.mypy"]
+
+[tool.pydantic-mypy]
+init_forbid_extra = true
+init_typed = true
+warn_required_dynamic_aliases = true
diff --git a/src/template_python/__init__.py b/src/template_python/__init__.py
index 8e0f674..c7ce31b 100644
--- a/src/template_python/__init__.py
+++ b/src/template_python/__init__.py
@@ -1,5 +1,12 @@
 """Reusable building blocks for the template project."""
 
+from importlib.metadata import PackageNotFoundError, version
+
 from template_python.core import greeting
 
-__all__ = ["greeting"]
+try:
+    __version__ = version("template-python")
+except PackageNotFoundError:  # pragma: no cover - only for an uninstalled source tree
+    __version__ = "0.0.0+unknown"
+
+__all__ = ["__version__", "greeting"]
diff --git a/src/template_python/__main__.py b/src/template_python/__main__.py
index 5d5bc5d..6dc25e0 100644
--- a/src/template_python/__main__.py
+++ b/src/template_python/__main__.py
@@ -2,4 +2,5 @@
 
 from template_python.cli import app
 
-app()
+if __name__ == "__main__":
+    app(prog_name="template-python")
diff --git a/src/template_python/cli.py b/src/template_python/cli.py
index 2aaafe2..f4ea853 100644
--- a/src/template_python/cli.py
+++ b/src/template_python/cli.py
@@ -6,34 +6,54 @@
 import typer
 from pydantic import ValidationError
 
+from template_python import __version__
 from template_python.core import greeting
-from template_python.logging import configure_logging
-from template_python.settings import get_project_settings
+from template_python.log import configure_logging
+from template_python.settings import ProjectSettings, get_project_settings
 
 app = typer.Typer(
     add_completion=False,
     help="A minimal, typed Python project template.",
     no_args_is_help=True,
+    pretty_exceptions_show_locals=False,
 )
 logger = logging.getLogger(__name__)
 
 
+def _print_version(value: bool) -> None:
+    if value:
+        typer.echo(f"template-python {__version__}")
+        raise typer.Exit
+
+
 @app.callback()
 def main(
+    ctx: typer.Context,
     verbose: Annotated[
         bool,
         typer.Option("--verbose", "-v", help="Enable debug logging."),
     ] = False,
+    _version: Annotated[
+        bool,
+        typer.Option(
+            "--version",
+            "-V",
+            callback=_print_version,
+            is_eager=True,
+            help="Show the version and exit.",
+        ),
+    ] = False,
 ) -> None:
-    """Configure the application before running a command."""
+    """Load settings and configure logging before running a command."""
     try:
         settings = get_project_settings()
     except ValidationError as exc:
         typer.echo(f"Invalid configuration: {exc}", err=True)
         raise typer.Exit(code=2) from exc
 
-    configure_logging("DEBUG" if verbose else settings.log_level)
+    configure_logging("DEBUG" if verbose else settings.log_level, settings.log_format)
     logger.debug("Loaded settings for %s", settings.name)
+    ctx.obj = settings
 
 
 @app.command()
@@ -49,3 +69,10 @@ def hello(
     except ValueError as exc:
         raise typer.BadParameter(str(exc), param_hint="--name") from exc
     typer.echo(message)
+
+
+@app.command("config")
+def show_config(ctx: typer.Context) -> None:
+    """Print the effective configuration as JSON; secret values are masked."""
+    settings = ctx.ensure_object(ProjectSettings)
+    typer.echo(settings.model_dump_json(indent=2))
diff --git a/src/template_python/log.py b/src/template_python/log.py
new file mode 100644
index 0000000..7be6524
--- /dev/null
+++ b/src/template_python/log.py
@@ -0,0 +1,41 @@
+"""Process logging configuration for the application boundary."""
+
+import json
+import logging
+import sys
+from datetime import UTC, datetime
+from typing import override
+
+TEXT_FORMAT = "%(asctime)s [%(levelname)s] %(name)s: %(message)s"
+LOG_FORMATS = frozenset({"text", "json"})
+
+
+class JsonFormatter(logging.Formatter):
+    """Render each record as a single-line JSON object for log collectors."""
+
+    @override
+    def format(self, record: logging.LogRecord) -> str:
+        payload: dict[str, str] = {
+            "timestamp": datetime.fromtimestamp(record.created, tz=UTC).isoformat(),
+            "level": record.levelname,
+            "logger": record.name,
+            "message": record.getMessage(),
+        }
+        if record.exc_info:
+            payload["exception"] = self.formatException(record.exc_info)
+        return json.dumps(payload, ensure_ascii=False)
+
+
+def configure_logging(level: str, log_format: str = "text") -> None:
+    """Configure root logging on stderr; call once at the application boundary."""
+    numeric_level = logging.getLevelNamesMapping().get(level.upper())
+    if numeric_level is None:
+        msg = f"unsupported log level: {level}"
+        raise ValueError(msg)
+    if log_format not in LOG_FORMATS:
+        msg = f"unsupported log format: {log_format}"
+        raise ValueError(msg)
+
+    handler = logging.StreamHandler(sys.stderr)
+    handler.setFormatter(JsonFormatter() if log_format == "json" else logging.Formatter(TEXT_FORMAT))
+    logging.basicConfig(level=numeric_level, handlers=[handler], force=True)
diff --git a/src/template_python/logging.py b/src/template_python/logging.py
deleted file mode 100644
index 870f87b..0000000
--- a/src/template_python/logging.py
+++ /dev/null
@@ -1,14 +0,0 @@
-"""Application logging configuration."""
-
-import logging
-
-LOG_FORMAT = "%(asctime)s [%(levelname)s] %(name)s: %(message)s"
-
-
-def configure_logging(level: str) -> None:
-    """Configure process logging at the application boundary."""
-    numeric_level = logging.getLevelNamesMapping().get(level.upper())
-    if numeric_level is None:
-        msg = f"unsupported log level: {level}"
-        raise ValueError(msg)
-    logging.basicConfig(level=numeric_level, format=LOG_FORMAT, force=True)
diff --git a/src/template_python/settings.py b/src/template_python/settings.py
index 1084bde..d77e142 100644
--- a/src/template_python/settings.py
+++ b/src/template_python/settings.py
@@ -5,13 +5,19 @@
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
 LogLevel = Literal["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"]
+LogFormat = Literal["text", "json"]
 
 
 class ProjectSettings(BaseSettings):
-    """Settings loaded from ``PROJECT_*`` environment variables."""
+    """Settings loaded from ``PROJECT_*`` environment variables and an optional ``.env`` file.
+
+    Declare credentials as ``pydantic.SecretStr`` so they are masked in ``repr`` and in
+    the ``config`` command output.
+    """
 
     name: str = "template-python"
     log_level: LogLevel = "INFO"
+    log_format: LogFormat = "text"
 
     model_config = SettingsConfigDict(
         env_file=".env",
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..a1dd759
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,21 @@
+import logging
+import os
+from collections.abc import Iterator
+from pathlib import Path
+
+import pytest
+
+
+@pytest.fixture(autouse=True)
+def isolated_environment(monkeypatch: pytest.MonkeyPatch, tmp_path: Path) -> Iterator[None]:
+    """Keep tests independent of the developer's shell, ``.env`` file, and logging state."""
+    for key in os.environ:
+        if key.upper().startswith("PROJECT_"):
+            monkeypatch.delenv(key)
+    monkeypatch.chdir(tmp_path)
+
+    root = logging.getLogger()
+    handlers, level = root.handlers[:], root.level
+    yield
+    root.handlers[:] = handlers
+    root.setLevel(level)
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 38e2faa..3ca717b 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -1,7 +1,15 @@
+import json
+import runpy
+import sys
+from pathlib import Path
+
 import pytest
+from pydantic import SecretStr
 from typer.testing import CliRunner
 
+from template_python import __version__, cli
 from template_python.cli import app
+from template_python.settings import ProjectSettings
 
 runner = CliRunner()
 
@@ -13,6 +21,29 @@ def test_cli_help() -> None:
     assert "A minimal, typed Python project template." in result.stdout
 
 
+def test_cli_without_command_shows_help() -> None:
+    result = runner.invoke(app, [])
+
+    assert result.exit_code == 2
+    assert "Usage:" in result.stdout
+
+
+@pytest.mark.parametrize("flag", ["--version", "-V"])
+def test_cli_version(flag: str) -> None:
+    result = runner.invoke(app, [flag])
+
+    assert result.exit_code == 0
+    assert result.stdout == f"template-python {__version__}\n"
+
+
+def test_cli_version_ignores_invalid_settings(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setenv("PROJECT_LOG_LEVEL", "VERBOSE")
+
+    result = runner.invoke(app, ["--version"])
+
+    assert result.exit_code == 0
+
+
 def test_cli_greets_name() -> None:
     result = runner.invoke(app, ["hello", "--name", "Ada"])
 
@@ -25,6 +56,18 @@ def test_cli_verbose_logging() -> None:
 
     assert result.exit_code == 0
     assert "Loaded settings for template-python" in result.stderr
+    assert result.stdout == "Hello, World!\n"
+
+
+def test_cli_json_logging(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setenv("PROJECT_LOG_FORMAT", "json")
+
+    result = runner.invoke(app, ["--verbose", "hello"])
+
+    assert result.exit_code == 0
+    record = json.loads(result.stderr.splitlines()[0])
+    assert record["level"] == "DEBUG"
+    assert record["message"] == "Loaded settings for template-python"
 
 
 def test_cli_rejects_blank_name() -> None:
@@ -41,3 +84,44 @@ def test_cli_reports_invalid_settings(monkeypatch: pytest.MonkeyPatch) -> None:
 
     assert result.exit_code == 2
     assert "Invalid configuration" in result.stderr
+
+
+def test_cli_reads_dotenv_from_working_directory(tmp_path: Path) -> None:
+    (tmp_path / ".env").write_text("PROJECT_NAME=from-dotenv\n", encoding="utf-8")
+
+    result = runner.invoke(app, ["config"])
+
+    assert result.exit_code == 0
+    assert json.loads(result.stdout)["name"] == "from-dotenv"
+
+
+def test_cli_config_shows_effective_settings(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setenv("PROJECT_LOG_FORMAT", "json")
+
+    result = runner.invoke(app, ["config"])
+
+    assert result.exit_code == 0
+    assert json.loads(result.stdout) == {"name": "template-python", "log_level": "INFO", "log_format": "json"}
+
+
+def test_cli_config_masks_secrets(monkeypatch: pytest.MonkeyPatch) -> None:
+    class SettingsWithSecret(ProjectSettings):
+        api_key: SecretStr = SecretStr("do-not-print")
+
+    monkeypatch.setattr(cli, "get_project_settings", SettingsWithSecret)
+
+    result = runner.invoke(app, ["config"])
+
+    assert result.exit_code == 0
+    assert "do-not-print" not in result.stdout
+    assert json.loads(result.stdout)["api_key"] == "**********"
+
+
+def test_module_entry_point(monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]) -> None:
+    monkeypatch.setattr(sys, "argv", ["template_python", "hello", "--name", "Module"])
+
+    with pytest.raises(SystemExit) as exc_info:
+        runpy.run_module("template_python", run_name="__main__")
+
+    assert exc_info.value.code == 0
+    assert capsys.readouterr().out == "Hello, Module!\n"
diff --git a/tests/test_log.py b/tests/test_log.py
new file mode 100644
index 0000000..ff43f1a
--- /dev/null
+++ b/tests/test_log.py
@@ -0,0 +1,46 @@
+import json
+import logging
+
+import pytest
+
+from template_python.log import configure_logging
+
+
+def test_configure_logging_emits_text_once(capsys: pytest.CaptureFixture[str]) -> None:
+    configure_logging("INFO")
+
+    logging.getLogger("template.test").info("ready")
+
+    captured = capsys.readouterr()
+    assert captured.err.count("ready") == 1
+    assert "[INFO] template.test: ready" in captured.err
+
+
+def test_configure_logging_emits_json(capsys: pytest.CaptureFixture[str]) -> None:
+    configure_logging("warning", "json")
+
+    logger = logging.getLogger("template.test")
+    logger.info("hidden")
+    try:
+        raise RuntimeError("boom")  # noqa: TRY301
+    except RuntimeError:
+        logger.exception("failed")
+
+    lines = capsys.readouterr().err.splitlines()
+    assert len(lines) == 1
+    record = json.loads(lines[0])
+    assert record["level"] == "ERROR"
+    assert record["logger"] == "template.test"
+    assert record["message"] == "failed"
+    assert "RuntimeError: boom" in record["exception"]
+    assert record["timestamp"].endswith("+00:00")
+
+
+def test_configure_logging_rejects_unknown_level() -> None:
+    with pytest.raises(ValueError, match="unsupported log level"):
+        configure_logging("TRACE")
+
+
+def test_configure_logging_rejects_unknown_format() -> None:
+    with pytest.raises(ValueError, match="unsupported log format"):
+        configure_logging("INFO", "xml")
diff --git a/tests/test_logging.py b/tests/test_logging.py
deleted file mode 100644
index bc06d1e..0000000
--- a/tests/test_logging.py
+++ /dev/null
@@ -1,19 +0,0 @@
-import logging
-
-import pytest
-
-from template_python.logging import configure_logging
-
-
-def test_configure_logging_emits_once(capsys: pytest.CaptureFixture[str]) -> None:
-    configure_logging("INFO")
-
-    logging.getLogger("template.test").info("ready")
-
-    captured = capsys.readouterr()
-    assert captured.err.count("ready") == 1
-
-
-def test_configure_logging_rejects_unknown_level() -> None:
-    with pytest.raises(ValueError, match="unsupported log level"):
-        configure_logging("TRACE")
diff --git a/tests/test_settings.py b/tests/test_settings.py
index 22f07f0..6656065 100644
--- a/tests/test_settings.py
+++ b/tests/test_settings.py
@@ -1,21 +1,51 @@
+from pathlib import Path
+
 import pytest
 from pydantic import ValidationError
 
 from template_python.settings import ProjectSettings
 
 
+def test_settings_defaults() -> None:
+    settings = ProjectSettings(_env_file=None)
+
+    assert settings.name == "template-python"
+    assert settings.log_level == "INFO"
+    assert settings.log_format == "text"
+
+
 def test_settings_use_prefixed_environment(monkeypatch: pytest.MonkeyPatch) -> None:
     monkeypatch.setenv("PROJECT_NAME", "example")
     monkeypatch.setenv("PROJECT_LOG_LEVEL", "DEBUG")
+    monkeypatch.setenv("PROJECT_LOG_FORMAT", "json")
 
     settings = ProjectSettings(_env_file=None)
 
     assert settings.name == "example"
     assert settings.log_level == "DEBUG"
+    assert settings.log_format == "json"
+
+
+def test_environment_overrides_dotenv(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    (tmp_path / ".env").write_text("PROJECT_NAME=from-file\nPROJECT_LOG_LEVEL=ERROR\n", encoding="utf-8")
+    monkeypatch.setenv("PROJECT_NAME", "from-env")
+
+    settings = ProjectSettings()
+
+    assert settings.name == "from-env"
+    assert settings.log_level == "ERROR"
+
+
+def test_settings_reject_unknown_dotenv_entry(tmp_path: Path) -> None:
+    (tmp_path / ".env").write_text("PROJECT_UNKNOWN=1\n", encoding="utf-8")
+
+    with pytest.raises(ValidationError):
+        ProjectSettings()
 
 
-def test_settings_reject_invalid_log_level(monkeypatch: pytest.MonkeyPatch) -> None:
-    monkeypatch.setenv("PROJECT_LOG_LEVEL", "VERBOSE")
+@pytest.mark.parametrize(("variable", "value"), [("PROJECT_LOG_LEVEL", "VERBOSE"), ("PROJECT_LOG_FORMAT", "xml")])
+def test_settings_reject_invalid_values(monkeypatch: pytest.MonkeyPatch, variable: str, value: str) -> None:
+    monkeypatch.setenv(variable, value)
 
     with pytest.raises(ValidationError):
         ProjectSettings(_env_file=None)
diff --git a/uv.lock b/uv.lock
index a19d80c..0922cef 100644
--- a/uv.lock
+++ b/uv.lock
@@ -7,6 +7,12 @@ resolution-markers = [
     "python_full_version < '3.14'",
 ]
 
+[[package]]
+name = "actionlint-py"
+version = "1.7.12.25"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/33/75/36ee89db39bb3620d1e46fe1f6ec77d6000d30ff45345699e51b4c850e83/actionlint_py-1.7.12.25.tar.gz", hash = "sha256:83f83be4cd317c79b15cbb7022787513a6994f00bfb2dd8da02fa4e62b4f640d", size = 12438, upload-time = "2026-09-22T16:24:42.477Z" }
+
 [[package]]
 name = "annotated-doc"
 version = "0.0.5"
@@ -259,6 +265,33 @@ css = [
     { name = "tinycss2" },
 ]
 
+[[package]]
+name = "boolean-py"
+version = "5.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/c4/cf/85379f13b76f3a69bca86b60237978af17d6aa0bc5998978c3b8cf05abb2/boolean_py-5.0.tar.gz", hash = "sha256:60cbc4bad079753721d32649545505362c754e121570ada4658b852a3a318d95", size = 37047, upload-time = "2025-04-03T10:39:49.734Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/e5/ca/78d423b324b8d77900030fa59c4aa9054261ef0925631cd2501dd015b7b7/boolean_py-5.0-py3-none-any.whl", hash = "sha256:ef28a70bd43115208441b53a045d1549e2f0ec6e3d08a9d142cbc41c1938e8d9", size = 26577, upload-time = "2025-04-03T10:39:48.449Z" },
+]
+
+[[package]]
+name = "cachecontrol"
+version = "0.14.4"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "msgpack" },
+    { name = "requests" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/2d/f6/c972b32d80760fb79d6b9eeb0b3010a46b89c0b23cf6329417ff7886cd22/cachecontrol-0.14.4.tar.gz", hash = "sha256:e6220afafa4c22a47dd0badb319f84475d79108100d04e26e8542ef7d3ab05a1", size = 16150, upload-time = "2025-11-14T04:32:13.138Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/ef/79/c45f2d53efe6ada1110cf6f9fca095e4ff47a0454444aefdde6ac4789179/cachecontrol-0.14.4-py3-none-any.whl", hash = "sha256:b7ac014ff72ee199b5f8af1de29d60239954f223e948196fa3d84adaffc71d2b", size = 22247, upload-time = "2025-11-14T04:32:11.733Z" },
+]
+
+[package.optional-dependencies]
+filecache = [
+    { name = "filelock" },
+]
+
 [[package]]
 name = "certifi"
 version = "2026.10.23"
@@ -622,6 +655,22 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/da/91/1805cc144497d76a436f66a21fa57492bee7ed1257826fb992f03b9b2b6f/coverage-7.17.2-py3-none-any.whl", hash = "sha256:e674027ceb6bfd959f1bb035000fd20fa8b717dc6765adaaf8bca347822c8c7d", size = 219280, upload-time = "2026-11-04T19:52:32.726Z" },
 ]
 
+[[package]]
+name = "cyclonedx-python-lib"
+version = "11.12.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "license-expression" },
+    { name = "packageurl-python" },
+    { name = "py-serializable" },
+    { name = "sortedcontainers" },
+    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/17/40/6509e6cfd7f2f3255501690f46375fdd224949e21fd1e96f4f4c8a9041b1/cyclonedx_python_lib-11.12.0.tar.gz", hash = "sha256:16767c4039de90c04e9f03348f8f0ed4b8ff842eaa7eefcad3a95685f970dacf", size = 1445378, upload-time = "2026-08-13T07:52:18.675Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/cf/f0/b2cb999244f2f4194df63ecff6939228178fa63a33be809c412684ca8db7/cyclonedx_python_lib-11.12.0-py3-none-any.whl", hash = "sha256:0e807521a921a5c3cb8ce1153f8a61d29eedfe76a46aac2796b7c6b573391a54", size = 529453, upload-time = "2026-08-13T07:52:16.836Z" },
+]
+
 [[package]]
 name = "debugpy"
 version = "1.8.22"
@@ -674,6 +723,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/d7/0d/6caab33488dc9d26440c24221fa610c7c8b83c30715ab45d31f0e004308e/fastjsonschema-2.22.3-py3-none-any.whl", hash = "sha256:f670b443830b75aca3f00b75949efa20f4b2a80302ec7a21505c28dd54cffd43", size = 28442, upload-time = "2026-11-01T21:11:29.306Z" },
 ]
 
+[[package]]
+name = "filelock"
+version = "4.2.9"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/a3/1d/d730c664fcb4f1d264a722722a3134cf0881854f73c1fd58abf87572f232/filelock-4.2.9.tar.gz", hash = "sha256:96530b7c538d4ea08493ab067247aab7948c54d8cd622cce711c97cccc5d9896", size = 663116, upload-time = "2026-11-04T18:37:10.014Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/00/05/76184fe08339723d643ab47887a8e4de8f2921ca4e008617ab7490af7857/filelock-4.2.9-py3-none-any.whl", hash = "sha256:a379c50a729e5b68c8519a4d26489f755d9769960a236ecd838190e2a78db2e9", size = 164734, upload-time = "2026-11-04T18:37:08.273Z" },
+]
+
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 version = "9.2.0"
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 version = "4.0.1"
@@ -2354,13 +2595,16 @@ name = "template-python"
 version = "0.0.13"
 source = { editable = "." }
 dependencies = [
+    { name = "pydantic" },
     { name = "pydantic-settings" },
     { name = "typer" },
 ]
 
 [package.dev-dependencies]
 dev = [
+    { name = "actionlint-py" },
     { name = "mypy" },
+    { name = "pip-audit" },
     { name = "prek" },
     { name = "pytest" },
     { name = "pytest-cov" },
@@ -2382,13 +2626,16 @@ test = [
 
 [package.metadata]
 requires-dist = [
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     { name = "pydantic-settings", specifier = ">=2.15,<3" },
     { name = "typer", specifier = ">=0.27,<1" },
 ]
 
 [package.metadata.requires-dev]
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+    { name = "pip-audit", specifier = ">=2.10,<3" },
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