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- L3Card/L2Card 新增 subtitle: str 字段(L1Card 不加) - L3Node 移除 subtitle 字段(数据迁入 Card) - assign_subtitles_voronoi 改写 Card.subtitle + L2 聚合 - _collect_card_strings 增加 skip_fields 排除 subtitle - _node_full_text/_node_anchored_text 保持 字幕:/[sN] 语义 - get_subtitle 读 Card.subtitle(L2/L3) - verify.py/synthesizer.py: l3.subtitle → l3.card.subtitle - 迁移脚本 tools/migrate_subtitle_to_card.py(幂等,300 棵树已迁移) - 9→6 个测试文件适配(3 个无需改动) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>