org.cannadb.growPhoto

A single photo in a grow's gallery. Modeled as its own record (rather than blobs embedded in entries) so galleries can grow without bloating other records and so each photo carries its own caption, ordering, and capture date. A photo attaches to a plant (the usual case — per-plant galleries) and/or to the grow (group/room shots, the cover), and may optionally link to the `org.cannadb.growEntry` it documents. The image blob lives on the publishing PDS; the record carries the blob ref plus metadata. Publishing this record IS the claim — contextualized by the publisher DID at display time. Visibility follows the parent grow's `listed` preference, gated by the AppView.