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

refactor: update difficulty levels and enhance scoring rubrics in documentation and code

Refactor evidence building and improve code readability in iso_adapter.py

refactor: build grading on OpenEnv Rubric system

fix: squash inflated evidence scores for wrongly contested concedable cases

feat: harden grader to penalise shallow operational behaviour

feat: make note grading contextual per-case harmful evidence

feat: harden grading, expand task catalog, add episode persistence

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