Math Question Bank + Diagram Engine

4-layer math architecture (sources, knowledge, generators, templates). 814 verified questions locally (P6 314, DSE14 100, DSE17 100, DSE10 100, DSE11 100, DSE13 100). Approved prod snapshot is 799 rows live (DSE10/11/13/14/17 + P6 + 25-question P3 pilot), with Leslie-facing taxonomy remapped to readable short keys and subtopics while canonical Essai topic/subtopic IDs stay unchanged. 114 templates, 45 subtopics. DSE10+DSE11 upgraded to Grade A with full exam-quality TikZ diagrams (coord planes + circles). P6 uplift split into 22 adopt-core + 24 adapt-stretch questions with dedicated handback pages. Diagram engine v5. Self-study prototype v4 with 9 card types. PRs to essai-api + essai-web awaiting review. EdCity OQB scraping is now proven end-to-end: 3,117 math MCQs captured, including 2,532 net-new questions, but about 95% are image-based so they are better for coverage, metadata, and OCR-assisted ingestion than direct structured import.