Add dynamic schema usage example

[konard]

Summary

• Added a new usage example demonstrating the dynamicParameterSchema feature
• The example shows a dynamic form submission scenario where the expected data structure depends on the selected form type
• Updated README to include the new example in the examples list
• Added npm script example:dynamic-schema to run the example

Implementation Details

The dynamic-schema.ts example demonstrates:

1. Runtime schema discovery: The form data schema changes based on which form type (contact, feedback, or support) is selected
2. dynamicParameterSchema usage: Returns a Zod schema at runtime to inform the LLM about the exact structure expected for a parameter
3. Iterative refinement: The LLM learns the schema through validation feedback and retries with correct data structure

Example Scenario

A form submission system with three form types, each requiring different data structures:

• contact: name, email, message
• feedback: rating, category, comment (optional)
• support: ticketId (TKT-XXXX format), priority, description, contactEmail

Test plan

• Build all packages successfully
• All unit tests pass (42/42)
• Type tests pass
• Lint checks pass
• Formatting checks pass
• CI passes on GitHub Actions

Closes

Fixes #3

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[konard]

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