docs(viewer): document npm registry bootstrap (#521)

packages/nodes/README.md

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+# @pascal-app/nodes
+
+Built-in node definitions for the Pascal viewer and editor.
+
+## Installation
+
+```bash
+npm install @pascal-app/core @pascal-app/viewer @pascal-app/editor @pascal-app/nodes
+```
+
+The package declares the remaining React, Next.js, Three.js, and UI libraries it needs as peer
+dependencies. Install any peers reported by your package manager.
+
+## Usage
+
+Load `builtinPlugin` once before mounting a Pascal viewer or editor:
+
+```typescript
+import { loadPlugin } from '@pascal-app/core'
+import { builtinPlugin } from '@pascal-app/nodes'
+
+await loadPlugin(builtinPlugin)
+```
+
+The plugin registers the built-in schemas, renderers, geometry builders, tools, and systems. Hosts
+can load additional plugins through the same `loadPlugin` API.
+
+See the
+[`@pascal-app/viewer` quick start](https://github.com/pascalorg/editor/tree/main/packages/viewer#usage)
+for bootstrap ordering in a React application.
+
+## License
+
+MIT