PersistentNegativeHoldings
A (group, replica) whose derived EntitlementLedger.holdings is negative — the real overspend net (design §4.6): a debit beyond a peer's pocket that nonetheless stays within the edge sum passes PerEdgeSafety yet strands holdings persistently negative. On a fully-delivered state this is a genuine overspend; under partial delivery of a multi-hop transfer-funded charge it may surface transiently and self-heal on anti-entropy.