fix(responses): fail loudly on MCP gateway failures (initial call, mid-stream, zero resolved tools) - #32579

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955, actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020, docker/build-push-action@0adf9959216b96bec444f325f1e493d4aa344497, docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/