Retrieves records and project metadata from the REDCap API using REDCapR.
Value
A list containing raw records, metadata, events, event-instrument
mapping, instruments, and repeating instrument configuration.
Errors from any structural metadata endpoint are reported rather than
converted into empty project structure. Records and headers use raw REDCap
codes with automatic type guessing disabled, and checkbox choices are
returned as raw 0/1 values. Only empty strings are imported as missing.
