exam-review

# exam-review — mistake and confusion review ## Purpose Clear recorded mistakes/confusions before the exam. Replay only existing records; teach no new chapter and invent no question. ## Activation Use at final review or when the student explicitly asks to replay mistakes/find gaps. ## Inputs - `study_state.json`'s `mistake_archive` and `confusion_log` when state exists; otherwise generated 「❌ 错题档案」 and confusion compatibility rows. - `references/quiz_bank.json`, used to fetch each recorded mistake by exact ID. ## Workflow 1. **Replay recorded mistakes.** Reload state (or `update_progress.py show`), fetch each exact bank item, and ask it again. Never add an unrecorded/bank-external question. For `requires_assets=true` or `maybe_requires_assets=true`, before asking, explaining, hinting, or solving, render every question-side `question_context` / `figure` / `diagram` / `table` asset, labelled `题面图` or `Question-side asset`. Only later may solution/review show `答案图` / `Answer-side asset`. A path is not an image. Preserve but never display `student_attempt`; its physical path is tainted across the complete quiz, teaching, and content-unit layers, including duplicate official-looking declarations. Missing/unreadable or UI-unrenderable prompt assets cause a fail-closed skip; `stub` / `page_reference` also require the original prompt page first. Use `scripts/show_question_assets.py` for every replay and treat a nonzero result as a skip; do not render a raw bank path direc...