Validates that the modality specified in the query is allowed for the v2.0 model. This function checks that the `modality` value is one of the supported modalities.
validate_modality(query)Invisibly returns TRUE if validation passes. Throws an error If the modality key is missing or if the selected modality is not allowed.
# Create a valid query
query <- get_valid_query()
validate_modality(query) # Passes validation
# Example with invalid modality
if (FALSE) { # \dontrun{
invalid_query <- get_valid_query()
invalid_query$modality <- "unsupported_modality"
validate_modality(invalid_query) # Throws error for invalid modality
} # }