docs: Document ai_best_practices as the foundational/parent AI-guidance layer

Summary

Indicates project/ai_best_practices as the foundational, parent authority for AI-assisted-development guidance in this repo's README — mirroring the model already documented in project/ai_initiative_marketing.

Changes (README.md only)

  • New "Relationship to ai_best_practices (foundational layer)" subsection under Skills, documenting the precedence model: defer to ai_best_practices by default; this repo's skills layer Initiative-specific guidance on top; any override of an upstream skill must be explicit (name the upstream skill + reason).
  • Adds ai_best_practices as the first entry under Authoritative docs.

The gitlab-cli-setup and contribution-credit skills themselves are unchanged.

Drafted with the assistance of AI (Claude Code / Opus 4.8).

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