- 新增 test_delta_semantics_per_event_type: 验证所有 5 种事件类型的 activeSecondsDelta 均为增量语义(非累计值) - ReadingEventV2 + ReadingEventTypeV2 已有完整实现(610行/22测试) - No readingTargetType/userId/knowledgeBaseId(编译时保证) Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>