setTransitionPhaseReporter

open fun setTransitionPhaseReporter(reporter: (String) -> Unit?)

Inject a reporter for sub-phase checkpoints inside a break transition, used to attribute transition cost (PLAYG-344 — mirror of the web AdPlayerController.setTransitionPhaseReporter). Pass null to disable, which is the default — the SDK only wires this in debug mode, so production DA-BREAK-TRANSITION reports keep their existing shape. Default no-op.