Get or create singleton World Bank MCP client instance.
Uses WB_MCP_SERVER_PATH, WB_MCP_GATEWAY_URL, and WB_MCP_GATEWAY_API_KEY
environment variables for configuration. Falls back to stdio transport
with the worldbank-mcp npm binary resolved from node_modules/.bin.
Get or create singleton World Bank MCP client instance.
Uses
WB_MCP_SERVER_PATH,WB_MCP_GATEWAY_URL, andWB_MCP_GATEWAY_API_KEYenvironment variables for configuration. Falls back to stdio transport with theworldbank-mcpnpm binary resolved fromnode_modules/.bin.