MCP tasks no longer give up on a failed check when a polling service is running

MCP servers are outside programs that give Claude Code extra tools, and some of their tools run as long tasks that Claude Code checks on now and then. When a polling service, a separate service that keeps checking on the task, is in place, a failed check no longer counts toward giving up. Claude Code waits for the next check instead. Before, the first failure moved straight to giving up and checking less often.