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ConvertRequest.start_page/end_page (1-based inclusive); per-request PdfConverter with config page_range, reuses loaded models. 1-based->0-based contained in marker adapter. PR-DocSrv-LargeDoc-Split-Markdown-1 commit 2. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>