fix sampling

[SecretiveShell]

fix sampling so that text is returned not [object Object]

Description

Server Details

• Server: everythinh
• Changes to: sample llm tool

Motivation and Context

unblocks sampling pr in python-sdk

How Has This Been Tested?

I tested this locally with my sampling client demo

Breaking Changes

if you depend on the bug then its breaking otherwise no

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Protocol Documentation
• My changes follows MCP security best practices
• I have updated the server's README accordingly
• I have tested this with an LLM client
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have documented all environment variables and configuration options

Additional context

for modelcontextprotocol/python-sdk#132

[dsp-ant]

Thank you