feat(prompts_sample): add sample for mcp prompts

[giuliastf]

The main purpose of this pr s to show how can be used the available get_prompt() LanGraph function for MCP servers.

[Copilot]

Pull request overview

This PR adds a sample implementation demonstrating MCP (Model Context Protocol) prompts through a code refactoring assistant. The sample includes an MCP server with tools for analyzing Python code, detecting code smells, and generating structured refactoring guidance using prompts.

Key Changes

• Adds MCP server with code analysis tools and refactoring prompts
• Implements LangGraph agent that uses MCP tools to analyze code and select appropriate refactoring strategies
• Provides comprehensive refactoring guidance for extract method, simplify conditionals, remove duplication, and improve naming patterns

Reviewed changes

Copilot reviewed 21 out of 22 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
uv.lock	Adds dependencies for MCP, Anthropic SDK, cryptography, and related packages
pyproject.toml	Configures workspace to include new sample project
samples/mcp-refactoring-assistant/pyproject.toml	Project configuration with dependencies for MCP, LangChain, and LangGraph
samples/mcp-refactoring-assistant/server.py	MCP server exposing tools (complexity analysis, code smell detection, refactoring guide) and prompts
samples/mcp-refactoring-assistant/graph.py	LangGraph agent that orchestrates code analysis and refactoring recommendation workflow
samples/mcp-refactoring-assistant/tools/*.py	Implementation of code analysis heuristics and refactoring guidance mapping
samples/mcp-refactoring-assistant/prompts/*.py	Detailed refactoring prompts with examples and best practices
Configuration files	LangGraph config, UiPath config, entry points, and bindings

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