fix: route Exa and CodeGraph through shared mcp adapter

extensions/codegraph.ts

@@ -1,23 +0,0 @@
-import { createMcpAdapter } from "pi-mcp-adapter";
-
-/** Connect Pi to the CodeGraph MCP server provided by the host machine. */
-export default createMcpAdapter({
-	config: {
-		settings: {
-			disableProxyTool: true,
-			scriptMode: false,
-		},
-		mcpServers: {
-			codegraph: {
-				command: "codegraph",
-				args: ["serve", "--mcp"],
-				lifecycle: "keep-alive",
-				directTools: ["codegraph_explore"],
-				includeTools: ["codegraph_explore"],
-				toolPrefix: "none",
-				approveTools: false,
-				exposeResources: false,
-			},
-		},
-	},
-});