tech: add GitHub Actions CI workflow

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

@@ -0,0 +1,20 @@
+name: CI setup
+
+description: 'Setup node, pnpm and install project dependencies for CI jobs'
+
+runs:
+  using: composite
+  steps:
+    - name: Set node
+      uses: actions/setup-node@6044e13b5dc448c55e2357c09f80417699197238 # v6.2.0
+      with:
+        node-version-file: .nvmrc
+
+    - name: Install pnpm
+      uses: pnpm/action-setup@41ff72655975bd51cab0327fa583b6e92b6d3061 # v4.2.0
+      with:
+        version: 10.28.2
+
+    - name: Install dependencies
+      shell: bash
+      run: pnpm i --frozen-lockfile

.github/workflows/ci.yml

@@ -0,0 +1,50 @@
+name: CI
+
+permissions:
+  contents: read
+
+on:
+  push:
+    branches:
+      - main
+
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Setup environment
+        uses: ./.github/actions/ci-setup
+
+      - name: Lint
+        run: pnpm lint
+
+  typecheck:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Setup environment
+        uses: ./.github/actions/ci-setup
+
+      - name: Typecheck
+        run: pnpm typecheck
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Setup environment
+        uses: ./.github/actions/ci-setup
+
+      - name: Test
+        run: pnpm test

.nvmrc

@@ -0,0 +1 @@
+24.10.0

.vscode/settings.json

@@ -29,7 +29,8 @@
     "markdown",
     "json",
     "jsonc",
-    "yaml"
+    "yaml",
+    "github-actions-workflow"
   ],
 
   "eslint.workingDirectories": [

package.json

@@ -14,6 +14,7 @@
     "dist"
   ],
   "engines": {
+    "node": ">=24.10.0",
     "pnpm": ">=10.28.2"
   },
   "scripts": {