feat(types): add "enhancement" as alias for "feature" type

Support --type enhancement as an alias for --type feature when creating
issues. The normalization happens before validation to ensure consistency
across all code paths.

Closes gt-hzanoe

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cmd/bd/create.go

@@ -197,7 +197,7 @@ var createCmd = &cobra.Command{
 				Notes:              notes,
 				Status:             types.StatusOpen,
 				Priority:           priority,
-				IssueType:          types.IssueType(issueType),
+				IssueType:          types.IssueType(issueType).Normalize(),
 				Assignee:           assignee,
 				ExternalRef:        externalRefPtr,
 				Ephemeral:          wisp,
@@ -520,7 +520,7 @@ var createCmd = &cobra.Command{
 			Notes:              notes,
 			Status:             types.StatusOpen,
 			Priority:           priority,
-			IssueType:          types.IssueType(issueType),
+			IssueType:          types.IssueType(issueType).Normalize(),
 			Assignee:           assignee,
 			ExternalRef:        externalRefPtr,
 			EstimatedMinutes:   estimatedMinutes,
@@ -729,7 +729,7 @@ func init() {
 	createCmd.Flags().Bool("silent", false, "Output only the issue ID (for scripting)")
 	createCmd.Flags().Bool("dry-run", false, "Preview what would be created without actually creating")
 	registerPriorityFlag(createCmd, "2")
-	createCmd.Flags().StringP("type", "t", "task", "Issue type (bug|feature|task|epic|chore|merge-request|molecule|gate|agent|role|rig|convoy|event)")
+	createCmd.Flags().StringP("type", "t", "task", "Issue type (bug|feature|task|epic|chore|merge-request|molecule|gate|agent|role|rig|convoy|event); enhancement is alias for feature")
 	registerCommonIssueFlags(createCmd)
 	createCmd.Flags().StringSliceP("labels", "l", []string{}, "Labels (comma-separated)")
 	createCmd.Flags().StringSlice("label", []string{}, "Alias for --labels")
@@ -854,7 +854,7 @@ func createInRig(cmd *cobra.Command, rigName, title, description, issueType stri
 		Notes:              notes,
 		Status:             types.StatusOpen,
 		Priority:           priority,
-		IssueType:          types.IssueType(issueType),
+		IssueType:          types.IssueType(issueType).Normalize(),
 		Assignee:           assignee,
 		ExternalRef:        externalRefPtr,
 		Ephemeral:          wisp,

cmd/bd/create_form.go

@@ -108,7 +108,7 @@ func CreateIssueFromFormValues(ctx context.Context, s storage.Storage, fv *creat
 		AcceptanceCriteria: fv.AcceptanceCriteria,
 		Status:             types.StatusOpen,
 		Priority:           fv.Priority,
-		IssueType:          types.IssueType(fv.IssueType),
+		IssueType:          types.IssueType(fv.IssueType).Normalize(),
 		Assignee:           fv.Assignee,
 		ExternalRef:        externalRefPtr,
 		CreatedBy:          getActorWithGit(), // GH#748: track who created the issue

cmd/bd/quick.go

@@ -66,7 +66,7 @@ Example:
 			Title:     title,
 			Status:    types.StatusOpen,
 			Priority:  priority,
-			IssueType: types.IssueType(issueType),
+			IssueType: types.IssueType(issueType).Normalize(),
 		}
 
 		ctx := rootCtx

internal/storage/sqlite/validators.go

@@ -40,7 +40,8 @@ func validateStatusWithCustom(value interface{}, customStatuses []string) error
 // validateIssueType validates an issue type value
 func validateIssueType(value interface{}) error {
 	if issueType, ok := value.(string); ok {
-		if !types.IssueType(issueType).IsValid() {
+		// Normalize first to support aliases like "enhancement" -> "feature"
+		if !types.IssueType(issueType).Normalize().IsValid() {
 			return fmt.Errorf("invalid issue type: %s", issueType)
 		}
 	}

internal/types/types.go

@@ -528,6 +528,17 @@ func (t IssueType) IsValidWithCustom(customTypes []string) bool {
 	return false
 }
 
+// Normalize maps issue type aliases to their canonical form.
+// For example, "enhancement" -> "feature".
+func (t IssueType) Normalize() IssueType {
+	switch t {
+	case "enhancement":
+		return TypeFeature
+	default:
+		return t
+	}
+}
+
 // RequiredSection describes a recommended section for an issue type.
 // Used by bd lint and bd create --validate for template validation.
 type RequiredSection struct {

internal/validation/bead.go

@@ -28,8 +28,10 @@ func ParsePriority(content string) int {
 
 // ParseIssueType extracts and validates an issue type from content.
 // Returns the validated type or error if invalid.
+// Supports type aliases like "enhancement" -> "feature".
 func ParseIssueType(content string) (types.IssueType, error) {
-	issueType := types.IssueType(strings.TrimSpace(content))
+	// Normalize to support aliases like "enhancement" -> "feature"
+	issueType := types.IssueType(strings.TrimSpace(content)).Normalize()
 
 	// Use the canonical IsValid() from types package
 	if !issueType.IsValid() {