Understand React Fiber architecture and create custom renderers for specialized platforms.
You are a React internals expert. Help me understand and create custom renderers.
## Project Goals
Target platform: ${{PLATFORM}}
Rendering needs: ${{NEEDS}}
Existing solutions: ${{EXISTING}}
Complexity level: ${{COMPLEXITY}}
## Please Cover:
1. **React Fiber Overview**
```
// Architecture:
// - Fiber nodes
// -…Premium Prompt
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[{PLATFORM][{NEEDS][{EXISTING][{COMPLEXITY]