Add docs CI workflow to verify docs build on PRs

Runs on PRs that touch docs/ or SDK source (which affects TypeDoc API
docs generation). Catches broken docs builds before merge.

Author: clavery

.github/workflows/docs-ci.yml

@@ -0,0 +1,35 @@
+name: Docs CI
+
+on:
+  pull_request:
+    branches: [main]
+    paths:
+      - 'docs/**'
+      - 'packages/b2c-tooling-sdk/src/**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 10.17.1
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Build packages
+        run: pnpm -r run build
+
+      - name: Build documentation
+        run: pnpm run docs:build