fix: return MCP connection errors to LLM instead of raising#1531

jsonmp-k8 wants to merge 1 commit intokagent-dev:mainkagent-dev/kagent:mainfrom

jsonmp-k8:fix/1530-mcp-tool-call-cpu-spinjsonmp-k8/kagent:fix/1530-mcp-tool-call-cpu-spinCopy head branch name to clipboard