chore: persistentEdits config option

Author: ThomasRooney

configuration.go

@@ -89,6 +89,19 @@ type Tests struct {
 	SkipResponseBodyAssertions bool `yaml:"skipResponseBodyAssertions"`
 }
 
+// PersistentEdits configures whether user edits to generated SDKs persist across regenerations
+// When enabled, user changes are preserved via 3-way merge with Git tracking
+type PersistentEdits struct {
+	// Enabled allows user edits to generated SDK code to persist through regeneration
+	// Requires Git repository and creates a pristine branch for tracking
+	Enabled bool `yaml:"enabled,omitempty"`
+
+	// PristineBranch specifies the Git branch name for tracking pristine generated code
+	// Defaults to "sdk-pristine" if not specified
+	PristineBranch       string         `yaml:"pristineBranch,omitempty"`
+	AdditionalProperties map[string]any `yaml:",inline"` // Captures any additional properties
+}
+
 type AllOfMergeStrategy string
 
 const (
@@ -119,7 +132,9 @@ type Generation struct {
 	// Mock server generation configuration.
 	MockServer *MockServer `yaml:"mockServer,omitempty"`
 
-	Tests Tests `yaml:"tests,omitempty"`
+	// PersistentEdits configures whether user edits persist across regenerations
+	PersistentEdits *PersistentEdits `yaml:"persistentEdits,omitempty"`
+	Tests           Tests            `yaml:"tests,omitempty"`
 
 	AdditionalProperties map[string]any `yaml:",inline"` // Captures any additional properties that are not explicitly defined for backwards/forwards compatibility
 }
@@ -382,6 +397,18 @@ func GetGenerationDefaults(newSDK bool) []SDKGenConfigField {
 			DefaultValue: ptr(newSDK),
 			Description:  pointer.From("Maintains the order of things like parameters and fields when generating the SDK"),
 		},
+		{
+			Name:         "persistentEdits.enabled",
+			Required:     false,
+			DefaultValue: ptr(false),
+			Description:  pointer.From("Enables preservation of user edits across SDK regenerations. Requires Git repository."),
+		},
+		{
+			Name:         "persistentEdits.pristineBranch",
+			Required:     false,
+			DefaultValue: ptr("sdk-pristine"),
+			Description:  pointer.From("The Git branch name for tracking pristine generated code."),
+		},
 		{
 			Name:         "deduplicateErrors",
 			Required:     false,