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/bc31b0a3334a6b356059ff117d2642dec69690374cb45591cda6a8ff3d4ea050.json

@@ -0,0 +1 @@
+[{"assertion_id": "G11.01#0", "attribute": "project_name", "value": "VERIZON ELYSON", "source_text": "VERIZON ELYSON", "normalized_value": null, "normalized_unit": null, "normalized_attribute": null, "normalization_notes": null, "source_text_preserved": true, "normalization_confidence": "high"}, {"assertion_id": "G11.01#1", "attribute": "project_address", "value": "7022 ELYSON EXCHANGE WAY CYPRESS, TX 77433", "source_text": "7022 ELYSON EXCHANGE WAY CYPRESS, TX 77433", "normalized_value": null, "normalized_unit": null, "normalized_attribute": null, "normalization_notes": null, "source_text_preserved": true, "normalization_confidence": "high"}, {"assertion_id": "G11.01#2", "attribute": "building_name", "value": "ELYSON TOWN CENTER - BUILDING C", "source_text": "ELYSON TOWN CENTER - BUILDING C", "normalized_value": null, "normalized_unit": null, "normalized_attribute": null, "normalization_notes": null, "source_text_preserved": true, "normalization_confidence": "high"}, {"assertion_id": "G11.01#3", "attribute": "general_note", "value": "All work of the general contractor and his subcontractors shall conform to the provisions of the federal, state, city, and county building laws, codes, ordinances, rules and regulations enforced by the authority having jurisdiction (AHJ).", "source_text": "1. ALL WORK OF THE GENERAL CONTRACTOR AND HIS SUBCONTRACTORS (HEREIN REFERRED COLLECTIVELY AS THE CONTRACTOR) SHALL CONFORM TO THE PROVISIONS OF THE FEDERAL, STATE, CITY, AND COUNTY BUILDING LAWS, CODES, ORDINANCES, RULES AND REGULATIONS ENFORCED BY THE AUTHORITY HAVING JURISDICTION (AHJ).", "normalized_value": null, "normalized_unit": null, "normalized_attribute": null, "normalization_notes": null, "source_text_preserved": true, "normalization_confidence": "high"}, {"assertion_id": "G11.01#4", "attribute": "general_note", "value": "Contractor shall warrant all workmanship and materials for a period of 1 year from the date of final completion.", "source_text": "10. UPON OWNER'S REQUEST, THE CONTRACTOR SHALL ISSUE A DUPLICATE OF BLUE-LINE DRAWING UPON COMPLETION... CONTRACTOR SHALL WARRANT ALL WORKMANSHIP AND MATERIALS... FOR A PERIOD OF 1 YEAR FROM THE DATE OF FINAL COMPLETION.", "normalized_value": null, "normalized_unit": null, "normalized_attribute": "warranty_period", "normalization_notes": "Value is a full sentence, only normalizing attribute for searchability.", "source_text_preserved": true, "normalization_confidence": "medium"}, {"assertion_id": "G11.01#5", "attribute": "general_note", "value": "Through-penetrations in fire-resistive walls shall conform to the Authority Having Jurisdiction's current adopted versions of the IBC and local amendments as well as directives by the Local Fire Marshal's Authority.", "source_text": "12. THROUGH-PENETRATIONS IN FIRE-RESISTIVE WALLS SHALL CONFORM TO THE AUTHORITY HAVING JURISDICTION'S CURRENT ADOPTED VERSIONS OF THE IBC AND LOCAL AMENDMENTS AS WELL AS DIRECTIVES BY THE LOCAL FIRE MARSHAL'S AUTHORITY.", "normalized_value": null, "normalized_unit": null, "normalized_attribute": null, "normalization_notes": null, "source_text_preserved": true, "normalization_confidence": "high"}, {"assertion_id": "G11.01#6", "attribute": "general_note", "value": "Owner-provided extinguishers shall travel distance not to exceed 75' in accordance w/ NFPA standard 10.", "source_text": "13. PROVIDED THAT EXTINGUISHERS SHALL TRAVEL DISTANCE NOT TO EXCEED 75' IN ACCORDANCE W/ NFPA STANDARD 10 AND AS DIRECTED BY THE FIRE MARSHAL.", "normalized_value": "75", "normalized_unit": "feet", "normalized_attribute": "max_extinguisher_travel_distance", "normalization_notes": "Extracted numerical value and unit from sentence.", "source_text_preserved": true, "normalization_confidence": "medium"}, {"assertion_id": "G11.01#7", "attribute": "general_note", "value": "The priority for project dimensions shall be in the following order: A. Mini dimension for accessibility clearance & building code requirement. B. Large scale details. C. Small scale details. D. Enlarged views, floor plans and elevations.", "source_text": "23. ALIGNMENT OF PARTITIONS AND FINISHES AS SCHEDULED SHALL BE STRAIGHT, TRUE, & PLUMB. THE PRIORITY FOR PROJECT DIMENSIONS SHALL BE IN THE FOLLOWING ORDER: A. MINI DIMENSION FOR ACCESSIBILITY CLEARANCE & BUILDING CODE REQUIREMENT. B. LARGE SCALE DETAILS. C. SMALL SCALE DETAILS. D. ENLARGED VIEWS, FLOOR PLANS AND ELEVATIONS.", "normalized_value": null, "normalized_unit": null, "normalized_attribute": null, "normalization_notes": null, "source_text_preserved": true, "normalization_confidence": "high"}, {"assertion_id": "G11.01#8", "attribute": "general_note", "value": "Ceiling heights are indicated from the floor elevation to the face of the suspended ceiling system or face of finish material as scheduled.", "source_text": "24. CEILING HEIGHTS ARE INDICATED FROM THE FLOOR ELEVATION TO THE FACE OF THE SUSPENDED CEILING SYSTEM OR FACE OF FINISH MATERIAL AS SCHEDULED.", "normalized_value": null, "normalizeLine truncated