Add hidden dump command for vCard debugging

frm dump <name> prints the raw vCard for a contact. Hidden from
help output, useful for debugging field storage issues.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: justinabrahms

cmd_dump.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+
+	"github.com/emersion/go-vcard"
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	cmd := &cobra.Command{
+		Use:    "dump <name>",
+		Short:  "Dump raw vCard for a contact (debugging)",
+		Args:   cobra.ExactArgs(1),
+		Hidden: true,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			cfg, err := loadConfig()
+			if err != nil {
+				return err
+			}
+
+			obj, _, err := findContactMulti(cfg, args[0])
+			if err != nil {
+				return err
+			}
+
+			var buf bytes.Buffer
+			enc := vcard.NewEncoder(&buf)
+			if err := enc.Encode(obj.Card); err != nil {
+				return fmt.Errorf("encoding vcard: %w", err)
+			}
+			fmt.Print(buf.String())
+			return nil
+		},
+	}
+	rootCmd.AddCommand(cmd)
+}