Defines the common interface for SDK generators with:
- Generate(), Available(), Install() methods
- Registry for managing multiple generators
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Initial pkg/sdk setup with Config types for OpenAPI SDK generation.
Includes language selection, diff config, and publish config.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>