feat(skills): add wellarchitected.github.com content to iac-terraform-orchestration-ops

[aRustyDev]

Summary

Add references and patterns from https://wellarchitected.github.com to the iac-terraform-orchestration-ops skill.

Rationale

The GitHub Well-Architected framework provides best practices for infrastructure operations, GitOps workflows, and CI/CD patterns that complement Terraform orchestration operations.

Scope

• Add wellarchitected.github.com as a reference
• Incorporate framework patterns for GitOps and infrastructure automation
• Add guidance on operational workflows, approvals, and change management per the framework

Related Skills

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

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