The JS mock services carried MPE_TABLES.pre_edit_hook / post_edit_hook values
but never acted on them, so a table configured with hooks behaved differently
in the mock than in production.
Add mockHookSource() to dcMockUtils (resolving a hook program name to the
source of its .js counterpart on the Drive) and run the hook where the SAS
backend does:
- editors/getdata runs the pre-edit hook after filtering, letting it reassign
visibleRows / visibleColumns (the work.OUT contract) - so an empty mirror can
display the live rows of the table it points at
- editors/stagedata and editors/loadfile run the post-edit hook before the
MPE_SUBMIT row is written, letting it reassign libref / dsn (the call
symputx contract) - so a changeset submitted against a mirror is raised
against the real table
Seed a demo pair in makedata (TESTDATA.DEMO_ORDERS plus an empty
TESTDATA.DEMO_MIRROR with both hooks) and cover it with a Cypress spec.
