Ensure available machine readable metadata for all data

We need to ensure that every dataset we provide includes machine-readable metadata in JSON-LD format. This enhancement will support better discovery, integration, and compliance with the NIAID Fundamental Blueprint metadata requirements.

The metadata must include the following elements:

identifier
name
description
dateCreated
author
funder
measurementTechnique
includedInDataCatalog
distribution

We should amend the catalog builder to make sure we collect and persist this for reuse.

Start by locating the catalog builder and tracing how dataset metadata is collected and persisted. Check the generated metadata against the listed JSON-LD elements and verify that every dataset includes them for reuse and discovery.

Written by the indexing model from the issue text.