Every field is shown with its own agreement level — the steward judges the mechanism, not a single opaque score.
Linking merges the two records to a single Blue Care Health ID. The staff-assisted record is kept as the survivor identity — it carries a verified Omang/facility check that a self-registration doesn't — and the other becomes an alias pointing to it. This action is logged to the audit trail and cannot be silently undone. Confirm once to arm it, twice to commit.