\name{load_model_spec}
\alias{load_model_spec}
\title{Load a Portable Model Specification}
\usage{load_model_spec(path_or_json)}
\arguments{
  \item{path_or_json}{Path to a JSON specification file or a JSON string.}
}
\value{A validated model specification list.}
\description{Load and validate a portable mars model specification.}
