fix: stop retrying initial MCP auth failures

tools/mcp_tool.py

@@ -1499,6 +1499,16 @@ class MCPServerTask:
                 # should not permanently kill the server.
                 # (Ported from Kilo Code's MCP resilience fix.)
                 if not self._ready.is_set():
+                    if _is_auth_error(exc):
+                        logger.warning(
+                            "MCP server '%s' failed initial OAuth authentication, "
+                            "not retrying automatically: %s",
+                            self.name, exc,
+                        )
+                        self._error = exc
+                        self._ready.set()
+                        return
+
                     initial_retries += 1
                     if initial_retries > _MAX_INITIAL_CONNECT_RETRIES:
                         logger.warning(