The registry layer's ecosystem-agnostic fault vocabulary: the exception form of a response-bound breach.

Every registry data plane reads its response bodies through boundedRead against a Limits budget, and the bounded read reports a breach as a value (a LimitError). Some consumers sit behind an exception-shaped boundary instead, and this module owns the typed form they carry there. The breach is about the budget, never about any one ecosystem's wire format, so the vocabulary lives beside the agnostic registry contract rather than in a protocol module.