fix: Zod to JSONSchema pipe strategies

[pierreliefauche]

When converting Zod schema to JSONSchema, set the pipe strategy to the mode corresponding to the schema being generated, either input or output.
This should help fix issues when the Zod schema has transforms.

Motivation and Context

Some Zod schemas have transforms in the form of pipes.
When generating a JSONSchema, zod-to-json-schema needs to be instructed as to which "side" of the pipe it should select for the JSON schema. For example z.string().pipe(z.number()) will be a string as input but number as output.

How Has This Been Tested?

I've been applying this patch-package for a couple months in production.

Breaking Changes

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

Additional context

[pierreliefauche]

cc @ihrpr 🙏

[ihrpr]

Thank you!

Sorry about the delays in review, appreciate your contribution!