docs: add quality self-assessment (82/100) with corpus duplicate-document audit finding

docs: restructure card with numbered sections (Overview / Evaluation / Future Work / Meta Info)

docs: rename Roadmap section to Future Work

docs: add surface-signal measurements to Limitations + Roadmap section

Team re-name

License -> cc-by-4.0 + section rename (Licensing & Limitations -> Limitations)

v2 — 45,589 pairs (BCAI 33K + crawl/synth)

initial commit