Docling body coverage audit

Open each sample to compare original.pdf, parsed_text.md, cleaned_body.md, raw_docling.md, and low-overlap blocks.

samplesectionsabstract_charsclean_body_charscandidate_pdf_blocksavg_pdf_block_coveragemin_pdf_block_coveragelow_coverage_blockshigh_risk_body_missing_blocksfront_summary_missing_blocksback_matter_low_overlap_blocksclean_noise_hitssample
01-jechem-2023-defect-engineering9172658558530.8310.020000open
02-jechem-2021-review1498850336250.8010.030010open
03-jpowsour-2015-severe-truncation881821981170.9230.82300000open
04-jpowsour-2016-multi-issue311824140170.2590.01312010open
05-acsenergylett-2019-low-ratio28972105400.0180.03936210open
06-nature-2022-early-stop14142733838560.5610.02217020open