chore(ENG-10153): add AGENTS.md with developer essentials

AGENTS.md

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+# React Native Elements
+
+React Native SDK for secure data collection on mobile (iOS + Android).
+
+## Build & Test
+
+```bash
+yarn install
+yarn build                              # bob build + prepare.js (creates dist/)
+yarn test                               # Jest unit tests
+yarn lint                               # ESLint
+npx jest --testPathPattern="<pattern>"  # Targeted test
+```
+
+Always verify fixes with targeted tests before considering done.
+
+## Project Structure
+
+- `src/` — Library source (TypeScript)
+- `tests/` — Unit tests (Jest + @testing-library/react-native)
+- `demo/` — Demo app
+- `dist/` — Build output (published to npm)
+- `prepare.js` — Post-build script that creates `dist/package.json` (strips devDeps, rewrites paths)
+
+## Gotchas
+
+- **`yarn` not `npm`**: Package manager is yarn. Uses `yarn.lock`.
+- **react-native-builder-bob**: Build tool (`bob build`), outputs to `dist/{commonjs,module,typescript}`. Configured in `package.json` under `"react-native-builder-bob"`.
+- **`prepare.js` is critical**: Runs after `bob build` to create the publishable `dist/package.json`. It strips devDependencies and rewrites `main`/`module`/`types` paths. Breaking this breaks npm publish.
+- **Publishing from `dist/`**: `cd dist && npm publish` — the dist directory is a self-contained package.
+- **Version `0.0.0` in source**: `package.json` version is always `0.0.0`. CI bumps it via `make update-version` before publish.
+- **Release triggered by GitHub Release**: Not on push to master — release workflow fires on `release: [released]` event.
+- **Peer deps**: `react` and `react-native` are peer dependencies. Tests use specific pinned versions in devDeps.
+- **Resolution overrides**: Several `resolutions` in package.json for transitive dependency issues — check before upgrading deps.
+
+## Release
+
+Triggered by creating a GitHub Release. CI runs `make update-version`, `make build`, then `cd dist && npm publish`. Published as `@basis-theory/react-native-elements`.
+
+## Docs
+
+- [React Native Elements SDK](https://developers.basistheory.com/docs/sdks/mobile/react-native/)

CLAUDE.md

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+@AGENTS.md