Add second-line-financial-services to Business & Marketing
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Adds second-line-financial-services, a community-maintained MIT marketplace of Claude Code plugins for second-line and 1.5-line financial-services GRC work. 8 capability plugins (model risk, TPRM and operational resilience, controls testing, financial crime governance, consumer compliance and fair lending, regulatory change, risk reporting), 4 sector overlays (banking, insurance, capital markets, payments / fintech), 68 skills total. Public-source-derived, US-deep with EU as overlay.
Placed under Business & Marketing in alphabetical order, matching the surrounding external-link entry format.