Add version field to SDK struct and SetVersion method that updates both
the internal version and the config's Package.Version. This enables the
release system to pass version information to SDK generators.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
SDK.Generate() and SDK.GenerateLanguage() now use the
generator registry to generate SDKs for configured languages.
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>