Advisory classification of a declared Group by its informational
ROLE, never a rendering treatment: 'core' marks content central to
understanding the workflow (condensed views include these first);
'details' marks depth on demand. Unset = a plain group. Consumers
reading a definition as data MUST treat an unknown kind as unset — growing
this list is an engine version bump, like every stored enum.
Advisory classification of a declared Group by its informational ROLE, never a rendering treatment:
'core'marks content central to understanding the workflow (condensed views include these first);'details'marks depth on demand. Unset = a plain group. Consumers reading a definition as data MUST treat an unknown kind as unset — growing this list is an engine version bump, like every stored enum.