feat(mcp): upgrade client SDK to v2 (#39247)

Co-authored-by: Matt Carey <mcarey@cloudflare.com>

packages/opencode/src/tool/code-mode.ts

@@ -1,5 +1,5 @@
 import * as Tool from "./tool"
-import { CallToolResultSchema, type CallToolResult } from "@modelcontextprotocol/sdk/types.js"
+import { type CallToolResult } from "@modelcontextprotocol/client"
 import { Cause, Effect, Schema } from "effect"
 import { CodeMode, Tool as SandboxTool, toolError } from "@opencode-ai/codemode"
 import { MCP } from "@/mcp"
@@ -149,7 +149,6 @@ const invokeChildTool = Effect.fn("CodeMode.invokeChildTool")(function* (input:
     return yield* Effect.promise(async () => {
       const raw = await input.entry.tool.client.callTool(
         { name: input.entry.tool.def.name, arguments: input.args },
-        CallToolResultSchema,
         {
           resetTimeoutOnProgress: true,
           signal: input.ctx.abort,