Fundamentos, Histórico e Estruturas de Núcleo de SOs

Round-15 hunt: picked; source: named-course / course-code long-video search (r15, wave 2); channel screens (sellers/exam/re-upload/devotional/vendor/events), provenance check, vendor/seller/devotional recheck and quality tier C + tier-C depth check passed; strict per-title check + final strict pass; oEmbed verified.