Disable setup-node automatic pnpm cache

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -21,6 +21,7 @@ jobs:
       - uses: actions/setup-node@v5
         with:
           node-version: 24
+          package-manager-cache: false
       - name: Enable pnpm via corepack
         run: corepack enable pnpm
       - name: Install dependencies