Apply roller CDC events via per-org API re-fetch (legacy fallback)
Source:R/sync.R
apply_roller_events_cdc.RdFetches current roles for each affected org via brreg_roles().
Produces field-level changelogs using diff_roller_state() on a
per-org basis. Slower than apply_roller_events() (bulk method)
but provides per-event timestamp attribution for sub-daily syncs.