feat: Implement wait_for_updates action for handling delayed cases and evidence

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

Add training notebook and benchmark runner for ChargebackOps

refactor: tighten rubric discrimination + LLM path + add running doc

Refactor evidence building and improve code readability in iso_adapter.py

fix: match structured output to hackathon spec format

fix: add [START]/[STEP]/[END] structured output to inference.py

feat: add OpenEnv overview documentation and enhance harmful evidence detection keywords

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

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