SPEC-013 BR-013-08, DL-013-09; SPEC-012 BR-012-01, DL-012-08 — paired transfers flow zero, unpaired at market value for returns (#183)
Publish PRD and 16 specifications PRD and specs become the wiki's source of truth for product documents. Engineering guidelines remain in the repository alongside the code. Adds Home index, sidebar navigation and a spec template page.