Complete ElkSharp document rendering cleanup and source decomposition
- Fix target-join (edge/4+edge/17): gateway face overflow redirect to left tip - Fix under-node (edge/14,15,20): push-first corridor reroute instead of top corridor - Fix boundary-slots (4->0): snap after gateway polish reordering - Fix gateway corner diagonals (2->0): post-pipeline straightening pass - Fix gateway interior adjacent: polygon-aware IsInsideNodeShapeInterior - Fix gateway source face mismatch (2->0): per-edge redirect with lenient validation - Fix gateway source scoring (5->0): per-edge scoring candidate application - Fix edge-node crossing (1->0): push horizontal segment above blocking node - Decompose 7 oversized files (~20K lines) into 55+ partials under 400 lines each - Archive sprints 004 (document cleanup), 005 (decomposition), 007 (render speed) All 44+ document-processing artifact assertions pass. Hybrid deterministic mode documented as recommended path for LeftToRight layouts. Tests verified: StraightExit 2/2, BoundarySlotOffenders 2/2, HybridDeterministicMode 3/3, DocumentProcessingWorkflow artifact 1/1. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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