diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..605a285
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,25 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  lint-and-test:
+    runs-on: ubuntu-slim
+
+    steps:
+      - name: Checkout source code
+        uses: actions/checkout@v6
+
+      - name: Lint markdown
+        uses: DavidAnson/markdownlint-cli2-action@v23
diff --git a/.markdownlint-cli2.jsonc b/.markdownlint-cli2.jsonc
new file mode 100644
index 0000000..4c466e7
--- /dev/null
+++ b/.markdownlint-cli2.jsonc
@@ -0,0 +1,22 @@
+{
+  "globs": ["**/*.md"],
+  "gitignore": true,
+  "ignores": ["node_modules/**"],
+  "config": {
+    "default": true,
+    "MD003": { "style": "atx" },
+    "MD004": { "style": "dash" },
+    "MD007": { "indent": 2 },
+    "MD013": false, // allow long lines
+    "MD024": { "siblings_only": true },
+    "MD028": false, // allow separation between quote blocks
+    "MD033": {
+      "allowed_elements": ["details", "summary", "br", "sub", "sup", "kbd", "abbr", "a", "img"]
+    },
+    "MD041": false,
+    "MD046": { "style": "fenced" },
+    "MD048": { "style": "backtick" },
+    "MD055": { "style": "leading_and_trailing" },
+    "MD060": { "style": "compact", "aligned_delimiter": false }
+  }
+}
diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
index 98252a4..0fb47d5 100644
--- a/CODE_OF_CONDUCT.md
+++ b/CODE_OF_CONDUCT.md
@@ -17,23 +17,23 @@ diverse, inclusive, and healthy community.
 Examples of behavior that contributes to a positive environment for our
 community include:
 
-* Demonstrating empathy and kindness toward other people
-* Being respectful of differing opinions, viewpoints, and experiences
-* Giving and gracefully accepting constructive feedback
-* Accepting responsibility and apologizing to those affected by our mistakes,
+- Demonstrating empathy and kindness toward other people
+- Being respectful of differing opinions, viewpoints, and experiences
+- Giving and gracefully accepting constructive feedback
+- Accepting responsibility and apologizing to those affected by our mistakes,
   and learning from the experience
-* Focusing on what is best not just for us as individuals, but for the
+- Focusing on what is best not just for us as individuals, but for the
   overall community
 
 Examples of unacceptable behavior include:
 
-* The use of sexualized language or imagery, and sexual attention or
+- The use of sexualized language or imagery, and sexual attention or
   advances of any kind
-* Trolling, insulting or derogatory comments, and personal or political attacks
-* Public or private harassment
-* Publishing others' private information, such as a physical or email
+- Trolling, insulting or derogatory comments, and personal or political attacks
+- Public or private harassment
+- Publishing others' private information, such as a physical or email
   address, without their explicit permission
-* Other conduct which could reasonably be considered inappropriate in a
+- Other conduct which could reasonably be considered inappropriate in a
   professional setting
 
 ## Enforcement Responsibilities