feat: Implement wait_for_updates action for handling delayed cases and evidence

feat: tighten EscalationROI, add ambiguous medium case, LLM note judge wrapper

feat: Add LLM softening support to IssuerAgent and implement related tests

feat: Implement multi-round dispute lifecycle with arbitration scoring and related tests

feat: add Gradio demo UI, realistic metadata, info dict, and metrics

refactor: update all imports for new directory structure

feat: Add parametric case generator for ChargebackOps

test: add audits docs and regression coverage