ABVX Agent Skills v0.2.0

Second public skill wave.\n\nAdded 10 adapted skills:\n- agents-best-practices\n- architecture-deepening-review\n- book-to-skill\n- browser-verification\n- complexity-optimizer\n- diagnose\n- frontend-product-builder\n- handoff\n- prototype-lab\n- web-quality-audit\n\nAlso refreshed README attribution and site references for the expanded skillpack.