Python: Add BGPT MCP sample using MCPStreamableHttpPlugin

[MoeenAsim]

Summary

This PR adds a new Python sample showing how to connect Semantic Kernel to the BGPT MCP server using MCPStreamableHttpPlugin.

Changes

• Add a new sample: agent_with_bgpt_mcp_plugin.py
• Add documentation for the BGPT sample in python/samples/concepts/mcp/README.md

The sample demonstrates how to use a remote MCP server for evidence-based scientific literature retrieval.

Fixes #14076

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[Copilot]

Pull request overview

Adds a new Python MCP concept sample that connects Semantic Kernel agents to the BGPT hosted MCP server via MCPStreamableHttpPlugin, plus a README entry to document how to run it. This expands the MCP samples to include evidence-oriented scientific literature retrieval via a remote MCP transport.

Changes:

• Added agent_with_bgpt_mcp_plugin.py demonstrating BGPT MCP connection over Streamable HTTP.
• Updated the MCP concepts README to include instructions for running the BGPT sample.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
python/samples/concepts/mcp/README.md	Documents the new BGPT MCP sample and how to run it.
python/samples/concepts/mcp/agent_with_bgpt_mcp_plugin.py	New sample showing an agent using MCPStreamableHttpPlugin against BGPT’s hosted Streamable HTTP endpoint.

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