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SegmentationTrainingExportService and TrainingDataExportService each injected TranscriptionBlockRepository, AnnotationRepository and DocumentRepository directly. They now go through: - TranscriptionBlockQueryService (extended) for the three eligible-block queries — used over TranscriptionService to keep SenderModelService → TrainingDataExportService → TranscriptionService cycle-free. - AnnotationService.findById (new) — read API on the annotation domain. - DocumentService.findById (already added in #417 commit 3). The TrainingDataExportServiceTest @DataJpaTest delegates the new service reads to the real JPA repositories via Mockito stubs in the new makeService helper, so the integration coverage stays unchanged. Refs #417 (C6.2 violations #6 and #7). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>