docs: complete GitLab vs Traditional Stack comprehensive comparison
- Added complete CI/CD pipeline comparison with code examples - Added GitOps implementation comparison (ArgoCD vs GitLab Agent) - Added Container Registry comparison (Harbor vs GitLab Registry) - Added Security & Compliance detailed analysis - Added Operational complexity breakdown - Added comprehensive cost analysis with TCO calculations - Added decision matrix for both approaches - Added migration path recommendations - Added final recommendations and conclusion - Total: ~12,000 words comprehensive comparison document
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