fix: force-terminate orphaned MCP stdio processes on cleanup failure (fixes #1073)#1355

fl-sean03 wants to merge 2 commits intokagent-dev:mainkagent-dev/kagent:mainfrom

fl-sean03:fix/1073-mcp-cleanup-cpufl-sean03/kagent:fix/1073-mcp-cleanup-cpuCopy head branch name to clipboard