create_or_update-onboarding-file

【数据与研究】Create and maintain onboarding artifacts including file-level onboarding MDs and repo-level entity catalogs. Covers template, folder organization, section conventions, and metadata. Enforces strict 1-to-1 mapping for source files and one entity catalog per repo. Use this whenever creating new onboarding files, repo entity catalogs, or auditing existi…

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