Stdio MCP servers that exit mid-initialize after a probe timeout now get one restart

When Claude Code connects to an MCP server over stdio (standard input/output, used for local server processes), it sometimes runs a version-negotiation probe first. If that probe times out and the server process then closes while still initializing, Claude Code now recognizes this specific pattern - a likely slow-starting server that exits on requests sent before it's ready - and restarts the server once without the probe, using whatever time is left in the connection budget.

Previously, only a different failure (a version-negotiation error causing the connection to close) triggered a stdio server restart; a probe-timeout-induced close was not handled.