Export SCHEMA_VERSION and enhance documentation

[jwaspin]

Summary

This pull request introduces the export of SCHEMA_VERSION to allow consumers to access the schema contract version without coupling to the schema shape.

Changes

• Exported SCHEMA_VERSION from the schema for easier access.
• Updated documentation to include information about SCHEMA_VERSION.
• Added tests to ensure SCHEMA_VERSION aligns with the expected schema version values.

Checklist

• Increment Version in package.json (semantic versioning)
• Updated README or documentation if needed
• Updated changelog if needed
• Updated/added tests if needed
• Updated/added examples if needed
• Ran pnpm test, all tests pass
• Ran pnpm lint

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