feat: Implement wait_for_updates action for handling delayed cases and evidence

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

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

feat: Implement Issuer agent for multi-round dispute lifecycle

Refactor evidence building and improve code readability in iso_adapter.py

feat: add card network metadata, trim README, add limitations section

feat: add adversarial evidence, nightmare difficulty, and benchmark splits

refactor: reorganize source files into core/, evaluation/, runners/, scenarios/ directories