feat: added React Native Renderer

[gitsad]

What does this PR do?

Adds @mobile-reality/mdma-renderer-react-native — a React Native rendering layer for MDMA, a sibling to @mobile-reality/mdma-renderer-react. It renders all 9 MDMA component types plus inline Markdown as native iOS/Android UI, reusing the existing headless stack (spec + runtime) unchanged and reimplementing only the view layer with RN primitives (dispatch, bindings, component state, policy, audit, and PII redaction all come from runtime).

Also adds demo-native/ — an Expo (SDK 54) example app: a provider-agnostic MDMA agent built on the Vercel AI SDK (OpenRouter / Anthropic / OpenAI, keys via .env). It mirrors the web Agent Chat's sub-agent/brief flow — the conversation model calls a generate_mdma tool with a brief, a separate author call produces the document, and it's rendered with renderer-react-native. Runs in Expo Go (core RN components only, no custom native modules).

Closes #

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing behavior to change)
• Refactor (no functional change)
• Documentation
• CI / tooling

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
• New package: @mobile-reality/mdma-renderer-react-native (depends on spec + runtime only; no changes to existing packages)
• New example (private, unpublished): @mobile-reality/mdma-demo-native

Checklist

• I have read the CONTRIBUTING guide.
• My code follows the existing code style (pnpm lint passes for the new package).
• 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). (No schema changes — renderer only.)
• Sensitive fields are marked with sensitive: true where appropriate. (Renderer honors sensitive from the spec — form inputs use secureTextEntry, table cells mask.)

How to Test

Renderer package

1. pnpm --filter @mobile-reality/mdma-renderer-react-native build
2. pnpm --filter @mobile-reality/mdma-renderer-react-native typecheck
3. pnpm --filter @mobile-reality/mdma-renderer-react-native test

Expo demo app (real agent, needs an API key)

1. cp demo-native/.env.example demo-native/.env and set one key (e.g. EXPO_PUBLIC_OPENROUTER_API_KEY=…).
2. pnpm --filter @mobile-reality/mdma-demo-native start --clear
3. Scan the QR with Expo Go (or press i / a for a simulator).
4. Ask "make me a contact form" — the agent replies conversationally and renders the form inline as native UI. Fill fields, toggle tasks, approve a gate to see store state update. Switch provider/model in ⚙️.

TODO

Add wider test coverage