Design a Plugin System for a Confluence-Like Document Editor

Problem Design a plugin/extension system for a Confluence-like wiki editor that lets third-party developers add new macro types, content renderers, and panel components.

Requirements

• Plugin registration: registerPlugin(manifest).
• Lifecycle hooks: onLoad, onUnload, onRender.
• Sandboxed execution — a faulty plugin must not crash the host.
• Plugin communication via an event bus (no direct host access).
• Marketplace: install / uninstall plugins at runtime.

Areas to design

• The key interfaces (Plugin, PluginManifest, PluginRegistry, PluginSandbox, EventBus, RenderContext).
• The isolation boundary that contains a misbehaving plugin.
• Versioning and how the host handles breaking API changes.