Add plugin system for custom renderers

[akonan]

Description

Create a plugin API allowing third-party developers to add custom renderers.

Plugin API

interface WiremdPlugin {
  name: string;
  version: string;
  renderers?: {
    [format: string]: Renderer;
  };
  transformers?: {
    [name: string]: Transformer;
  };
}

function registerPlugin(plugin: WiremdPlugin): void;

Example Plugin

const flutterPlugin: WiremdPlugin = {
  name: 'wiremd-flutter',
  version: '1.0.0',
  renderers: {
    flutter: (ast) => generateFlutterCode(ast)
  }
};

registerPlugin(flutterPlugin);

Use Cases

• Custom framework renderers (Flutter, React Native)
• Custom visual styles
• Domain-specific transformations
• Export to proprietary formats

Priority

Medium

Labels

enhancement, plugins, api