Open PIRs carry forward to the new file with confidence degraded one step and inherits_from extended by the parent pir_id so genealogy inheritance is fully preserved.
Non-open PIRs (answered, superseded, deferred, cancelled) are carried forward UNCHANGED — including any pre-existing inherits_from chain — so the historical lineage is never lost.
Roll-forward semantics:
inherits_fromextended by the parentpir_idso genealogy inheritance is fully preserved.inherits_fromchain — so the historical lineage is never lost.