fix(dev-tools): ship dist/ to npm so Rozenite plugin loads

[azizbecha]

Fixes #204.

Summary

@react-native-ai/dev-tools@0.12.0 is published to npm without a dist/ folder, so Rozenite cannot discover the plugin (blank panel) and the documented import paths point at non-existent files. This PR fixes the packaging without touching any runtime code.

Root cause

• The repo .gitignore excludes dist/.
• packages/dev-tools/package.json has no "files" field.
• When npm publish builds the tarball without a "files" whitelist, it respects .gitignore and strips dist/. The prepare script (rozenite build) does run, but its output is excluded from the tarball.
• Result: consumers get only package.json + sources, no dist/rozenite.json, no entry-point JS, no UI bundle. main/module/types all dangle.

The other symptoms reported in #204 are downstream of this:

• "Need to use /react-native subpath" — Metro happens to resolve react-native.ts source from the package root when dist/ is absent.
• "react-json-tree missing" / "Invalid hook call" — only surface because users are forced to rebuild inside node_modules, where peer/dev separation breaks. react-json-tree is already correctly listed in dependencies.

Once dist/ ships, all of these go away.

Change

Single file: packages/dev-tools/package.json. Adds two top-level fields:

• "files": ["dist"] — whitelists the built artifact for the npm tarball, overriding .gitignore.
• "exports" — explicit map covering both . (the documented root import) and ./react-native (the workaround users adopted from the issue thread). Both map to the same built entry, so there's no behavioral split. ./package.json is exposed for tooling that introspects it. Existing main/module/types are kept untouched for older bundlers.

No source code, no docs, no version bump, no new dependencies.

Verification

1. Clean rebuild produces the expected dist:

   rm -rf dist && bun run prepare
   

   Confirmed dist/rozenite.json, dist/react-native.{js,cjs,d.ts}, dist/App.html, dist/assets/App-*.js, plus per-function entries and dist/src/**/*.d.ts.

2. npm pack --dry-run tarball (25 files, 169 KB packed / 850 KB unpacked) now includes:

   • dist/rozenite.json ✓ (Rozenite plugin manifest — fixes blank panel)
   • dist/react-native.{js,cjs,d.ts} ✓ (entry points for the documented root import)
   • dist/App.html + dist/assets/App-*.js ✓ (UI bundle)
   • dist/{getAiSdkTracer,useAiSdkDevTools,telemetry-recorder}.{js,cjs} ✓
   • dist/src/**/*.d.ts ✓ (type declarations referenced by react-native.d.ts)
   • LICENSE, README.md, package.json (auto-included)

   And correctly excludes src/, react-native.ts, vite.config.ts, rozenite.config.ts, tsconfig.json — those are build inputs, not runtime artifacts.

3. Node resolver on the published shape resolves both:

   • @react-native-ai/dev-tools → dist/react-native.cjs
   • @react-native-ai/dev-tools/react-native → dist/react-native.cjs

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