Trying to clean things up.
Reverting back to 'Dive into Hydra' models and datastreams.
Completely reverted to 'Dive into Hydra' demo. Added content test for this model.
Adjusted content model test so that page fields show in query results.
Resolved 'autoload' / 'circular dependency' issues (Datastreams::PageMetadata instead of PageMetadata). Also changed element names which allowed their display in blacklight.
Attempted another round with multiple metadata datastreams to no avail.