Initial commit: Conflict Checker

Cross-discipline design-contradiction checker for construction drawing
sets. Standalone tool broken out from Iron_Bid; a pipeline stage may
later fold back into Iron_Bid.

Pipeline: PDF->images -> per-sheet assertion extraction -> deterministic
clustering by location -> per-cluster reasoning -> report.
Includes CLI (cli/run_check.py) and web UI (backend/main.py).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/.llm_cache/414e0bb3f2732c3f70611f12dc5e59fe5af382a1f3bc61e84d39c61363c500b6.json

@@ -0,0 +1 @@
+{"conflicts": [{"conflict_id": "edf1_tmv_missing_on_plan", "category": "missing_element", "severity": "medium", "confidence": "high", "location": "Women's Restroom, wall at Drinking Fountain EDF-1", "disciplines": ["Plumbing", "Architectural"], "sheets": ["P03.01", "P02.01"], "description": "The plumbing riser diagram on sheet P03.01 indicates that a thermostatic mixing valve (TMV) is required to supply tempered water to the electric drinking fountain (EDF-1). However, this TMV is not located on the plumbing floor plan on P02.01. The valve requires physical space within the wall and potentially an access panel, which is not accounted for and must be coordinated with architecture.", "evidence": [{"discipline": "Plumbing", "sheet": "P03.01", "source_text": "WATER T.S. PLAN - FOR PIPE SIZING ONLY (TYPICAL)", "asserted_value": "Riser diagram shows fixture EDF-1 is supplied with tempered water via a Thermostatic Mixing Valve (TMV)."}, {"discipline": "Plumbing", "sheet": "P02.01", "source_text": "FLOOR PLAN- SANITARY WASTE & VENT", "asserted_value": "The floor plan shows fixture EDF-1, but the required TMV is not shown in the adjacent wall."}], "recommended_resolution": "coordinate drawings"}]}