Fix SDK CI: add mcp-client as extra dep

SDK imports agent_builder_mcp_client at runtime (agent.py), so it
needs to be installed alongside types before running SDK tests.

Author: zongrenl

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
     uses: ./.github/workflows/_test-package.yml
     with:
       package-path: packages/sdk
-      extra-deps: packages/types
+      extra-deps: packages/types packages/mcp-client
 
   integration:
     runs-on: ubuntu-latest