feat(sdk): add SetVersion method for release integration

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>

pkg/sdk/sdk.go

@@ -53,6 +53,7 @@ type PublishConfig struct {
 type SDK struct {
 	config     *Config
 	projectDir string
+	version    string
 }
 
 // New creates a new SDK instance.
@@ -66,6 +67,15 @@ func New(projectDir string, config *Config) *SDK {
 	}
 }
 
+// SetVersion sets the SDK version for generation.
+// This updates both the internal version field and the config's Package.Version.
+func (s *SDK) SetVersion(version string) {
+	s.version = version
+	if s.config != nil {
+		s.config.Package.Version = version
+	}
+}
+
 // DefaultConfig returns sensible defaults for SDK configuration.
 func DefaultConfig() *Config {
 	return &Config{

pkg/sdk/sdk_test.go

@@ -0,0 +1,30 @@
+package sdk
+
+import (
+	"testing"
+)
+
+func TestSDK_Good_SetVersion(t *testing.T) {
+	s := New("/tmp", nil)
+	s.SetVersion("v1.2.3")
+
+	if s.version != "v1.2.3" {
+		t.Errorf("expected version v1.2.3, got %s", s.version)
+	}
+}
+
+func TestSDK_Good_VersionPassedToGenerator(t *testing.T) {
+	config := &Config{
+		Languages: []string{"typescript"},
+		Output:    "sdk",
+		Package: PackageConfig{
+			Name: "test-sdk",
+		},
+	}
+	s := New("/tmp", config)
+	s.SetVersion("v2.0.0")
+
+	if s.config.Package.Version != "v2.0.0" {
+		t.Errorf("expected config version v2.0.0, got %s", s.config.Package.Version)
+	}
+}