pin node version, add typecheck

Author: jonathanlab

.github/workflows/typecheck.yml

@@ -0,0 +1,24 @@
+name: Type check
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  typecheck:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+        with:
+          persist-credentials: false
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+      - name: Run type check
+        run: pnpm exec tsc --noEmit

.node-version

@@ -0,0 +1 @@
+22