feat(examples): add an opt-in Parallel Search MCP example #641

Would a runnable AutoGen example using Parallel Search MCP fit in examples/? It would let an agent search the web and fetch pages for free, with no Parallel account or API key. Anonymous search uses Fast mode and is intended for exploration and light use.

I'd follow Calc-X's McpWorkbench pattern with HTTP transport, declare the example dependencies, and document connecting the model client through the Agent Lightning gateway. Validation would cover anonymous search and page fetching through the workbench, plus tool dispatch in the agent loop. This would be a separate example and preserve the existing Calc-X and Search-R1 workflows.

I work at Parallel.