- Grader: separate followup hint from scoring feedback - Interviewer: use followup hint directly without prefix/suffix - Restored standard and choice question presentation paths
grader.node.spec.ts — 13 tests: LLM mock validation, breakout logic (shorts/IDontKnow), error handling, scoring/indexing, zh/ja language support interviewer.node.spec.ts — 11 tests: empty questions, index bounds, standard presentation, follow-up mode, zh/ja/en localization