Align ExpMeta long-read fields with GenFS pathogen-surveillance draft

GenFS (Genomics for Food and Feed Safety — a US interagency group spanning CDC, FDA, USDA, and NCBI Pathogen Detection, represented by Ruth Timme and Jessica Chen) has independently developed a long-read sequencing metadata specification for pathogen surveillance, partly using ExpMeta's draft as a starting point.

The two efforts need to be reviewed against each other and merged where they overlap, rather than left to diverge into incompatible standards.

Start by locating ExpMeta’s current draft long-read fields and obtaining the GenFS pathogen-surveillance metadata specification described in the issue. Compare overlapping properties and document an agreed merged set; the work is done when the two efforts no longer define incompatible fields.

Written by the indexing model from the issue text.