feat(skills): add wellarchitected.github.com content to cicd-github-actions-dev

[aRustyDev]

Summary

Add references and patterns from https://wellarchitected.github.com to the cicd-github-actions-dev skill.

Rationale

The GitHub Well-Architected framework provides best practices for GitHub Actions workflows that would complement the existing CI/CD development guidance in this skill.

Scope

• Add wellarchitected.github.com as a reference
• Incorporate relevant patterns into existing sections
• Add new sections if framework covers areas not currently addressed

Related Skills

This is part of a broader effort to add wellarchitected.github.com content to:

• cicd-github-actions-dev (this issue)
• cicd-github-actions-ops
• github-actions-dev
• github-app-dev
• iac-terraform-modules-eng
• iac-terraform-orchestration-ops