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

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

packages/opencode/package.json

@@ -30,6 +30,7 @@
   },
   "devDependencies": {
     "@babel/core": "7.28.4",
+    "@modelcontextprotocol/server": "2.0.0-beta.5",
     "@octokit/webhooks-types": "7.6.1",
     "@opencode-ai/core": "workspace:*",
     "@opencode-ai/http-recorder": "workspace:*",
@@ -80,7 +81,7 @@
     "@effect/platform-node": "catalog:",
     "@ff-labs/fff-bun": "0.9.4",
     "@gitlab/opencode-gitlab-auth": "1.3.3",
-    "@modelcontextprotocol/sdk": "1.29.0",
+    "@modelcontextprotocol/client": "2.0.0-beta.5",
     "@octokit/graphql": "9.0.2",
     "@octokit/rest": "catalog:",
     "@openauthjs/openauth": "catalog:",