remove type from loading

[SashankMeka1]

Description

loadGraph() loads in type because saveGraph saves it as described in 3210

Server Details

• Server: memory
• Changes to: index.ts, knowledge-graph.tst.ts

Motivation and Context

Fixed a validation error where search_nodes (and other tools) returned entities/relations with a type field that wasn't in the schema.

How Has This Been Tested?

Added 3 unit tests verifying entities/relations loaded from file

Breaking Changes

None

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

[dsp-ant]

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