Function load_workload 

pub fn load_workload(path: &Path) -> Result<Workload>

Loads and validates a workload from a JSON file path.

Reads the file, parses JSON, and validates all required fields are present and well-formed. Returns a descriptive BenchError::WorkloadValidation error on schema violations.

Errors

• BenchError::WorkloadNotFound if the file does not exist
• BenchError::WorkloadValidation if JSON parsing fails or required fields are invalid