Reverts commits937311c,1dcb0c6,0300e96,999f9a2. The thin-rect-to-line synthesis and stacked table splitting improved extraction for specific government PDFs but caused -0.05 TEDS regression on the benchmark by preempting the heuristic detector with worse line-based grids. These features need more targeted guards before re-enabling. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>