Add --json flag support to more bd commands

- stats: Added --json flag for programmatic output
- show, update: Added --json flag for issue details
- close, reopen: Added --json flag for bulk operations
- dep (add, remove, tree, cycles): Added --json flags
- label (add, remove, list, list-all): Added --json flags
- duplicates, merge: Added --json flags

Closes bd-4dcd2d09

cmd/bd/reopen.go

@@ -22,6 +22,7 @@ This is more explicit than 'bd update --status open' and emits a Reopened event.
 	Args: cobra.MinimumNArgs(1),
 	Run: func(cmd *cobra.Command, args []string) {
 		reason, _ := cmd.Flags().GetString("reason")
+		jsonOutput, _ := cmd.Flags().GetBool("json")
 
 		ctx := context.Background()
 		
@@ -146,5 +147,6 @@ This is more explicit than 'bd update --status open' and emits a Reopened event.
 
 func init() {
 	reopenCmd.Flags().StringP("reason", "r", "", "Reason for reopening")
+	reopenCmd.Flags().Bool("json", false, "Output JSON format")
 	rootCmd.AddCommand(reopenCmd)
 }