Fix/validator

[gitsad]

What does this PR do?

Closes #

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• CI / tooling

Packages Affected

• @mobile-reality/mdma-validator
• @mobile-reality/mdma-renderer-react
• @mobile-reality/mdma-prompt-pack
• @mobile-reality/mdma-validator
• @mobile-reality/mdma-runtime
• @mobile-reality/mdma-parser
• @mobile-reality/mdma-demo

Checklist

• My code follows the existing code style (pnpm format and pnpm lint pass).
• I have added or updated tests that cover my changes.
• All tests pass (pnpm test).
• Type-checking passes (pnpm typecheck).
• I have added a changeset (pnpm changeset) if this change affects published packages.
• New or changed MDMA schemas are backwards-compatible (or marked as breaking).
• Sensitive fields are marked with sensitive: true where appropriate.

How to Test

1. run demo locally and check validator tab

Screenshots / Examples