Feat/prompt pack 0.3.0

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What does this PR do?

Prepares the @mobile-reality/mdma-prompt-pack release for 0.3.0 by adding a changeset and reverting the manual version bump. The actual version increment will be applied by pnpm changeset version during the release process.

Follows the merge of the model-specialised prompt variants PR (adds getAuthorPromptVariant, 20+ new variants for OpenAI / Anthropic / Google / xAI).

Closes #

Type of Change

• Bug fix
• New feature
• Breaking change
• Refactor
• Documentation
• CI / tooling
• Release / versioning

Packages Affected

• @mobile-reality/mdma-spec
• @mobile-reality/mdma-parser
• @mobile-reality/mdma-runtime
• @mobile-reality/mdma-attachables-core
• @mobile-reality/mdma-renderer-react
• @mobile-reality/mdma-prompt-pack

Checklist

• I have read the CONTRIBUTING guide.
• 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 pnpm changeset version — verify @mobile-reality/mdma-prompt-pack is bumped to 0.3.0 and a CHANGELOG.md entry is generated.
2. Run pnpm build — verify the package builds cleanly.

Screenshots / Examples

Changeset file: .changeset/fifty-worms-live.md