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priority: medium
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- API stability: plugin interfaces are versioned, breaking changes require major version bump
- Plugin discovery: support both static (compile-time) and dynamic (runtime) registration
- Plugin validation: check capabilities, supported formats, and version compatibility before registration
- Plugin chaining: post-processors can be composed in sequence
- Configuration: plugins accept typed configuration, validated at registration time
- Documentation: every plugin type must have a development guide with examples
