feat(person): make last name optional

Amolith created 

Assisted-by: Claude Sonnet 4 via Crush

Change summary

cmd/person/add.go | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)

Detailed changes

cmd/person/add.go 🔗 

@@ -17,12 +17,13 @@ import (
 
 // AddCmd creates a new person. Exported for potential use by shortcuts.
 var AddCmd = &cobra.Command{
-	Use:   "add FIRST LAST",
+	Use:   "add FIRST [LAST]",
 	Short: "Add a new person",
 	Long: `Add a new person to the Lunatask relationship tracker.
 
-Names are required. Use flags to set additional properties.`,
-	Args: cobra.ExactArgs(2),
+First name is required; last name is optional.
+Use flags to set additional properties.`,
+	Args: cobra.RangeArgs(1, 2),
 	RunE: runAdd,
 }
 
@@ -36,7 +37,11 @@ func init() {
 
 func runAdd(cmd *cobra.Command, args []string) error {
 	firstName := args[0]
-	lastName := args[1]
+
+	lastName := ""
+	if len(args) > 1 {
+		lastName = args[1]
+	}
 
 	apiClient, err := client.New()
 	if err != nil {