Release v4.229.0

Added

• The canonical corpus has a SourcelessGivensCorpus vector that pins how specifications treat given events without for, across four source layouts. It covers constraint outcomes and the refusal to invent an event source identity. (#579)

Changed

• The specification documentation now defines where a given event without for belongs: the event source the specification acts on. It also covers how constraints count it, when the reference evaluator reports Unsupported instead of inventing an identity, and how runners that append to real event streams should place it. See Givens without an event source. (#579)