Fix: clean up accidental spec.types.ts

[KKonstantinov]

/spec.types.ts appears to be accidentally committed.

Motivation and Context

Remove needless file.

How Has This Been Tested?

Spec tests still passing. Correct file is in src/spec.types.ts

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 Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/sdk@1122

commit: 3b5ee16

[mattzcarey]

LGTM