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The marketing-plan skill references both heavily — Section 12 of every plan cross-references all 139 marketing-ideas, and Section 2 (Strategic frame) builds on customer-research output. Adding the reverse pointers so users browsing those skills can discover the comprehensive-plan deliverable. Not adding to product-marketing because it has no Related Skills section to extend. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>