Unskip WorkflowAsActivityInternal by scoping lookups to the instance.
Add Memory/EF cases for journal ordered vs default FindMany paging and
activity-execution FindMany/FindManySummaries filter and projection parity.
Honor StartedAt order on EF FindManySummaries so Studio list summaries
cannot drift from Memory.
Fixes#8121
Co-authored-by: Cursor Agent <cursoragent@cursor.com>