ci: harden pnpm setup

.github/workflows/install-smoke.yml

@@ -13,11 +13,19 @@ jobs:
       - name: Checkout CLI
         uses: actions/checkout@v4
 
-      - name: Setup pnpm
-        uses: pnpm/action-setup@v4
-        with:
-          version: 10.23.0
-          run_install: false
+      - name: Setup pnpm (corepack retry)
+        run: |
+          set -euo pipefail
+          corepack enable
+          for attempt in 1 2 3; do
+            if corepack prepare pnpm@10.23.0 --activate; then
+              pnpm -v
+              exit 0
+            fi
+            echo "corepack prepare failed (attempt $attempt/3). Retrying..."
+            sleep $((attempt * 10))
+          done
+          exit 1
 
       - name: Install pnpm deps (minimal)
         run: pnpm install --ignore-scripts --frozen-lockfile