feat: add canonical demo URLs and update root endpoint response

Refactor evidence building and improve code readability in iso_adapter.py

fix: replace silent suppress with logged warning for Gradio mount failure

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

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

refactor: update all imports for new directory structure

feat: Add parametric case generator for ChargebackOps

feat: add API and deployment entrypoints