🧪 [testing improvement] Infrastructure Detection Tests

[arvarik]

🎯 What: Added missing test coverage for infrastructure-only project detection. 📊 Coverage: Added tests for Docker Compose, Terraform, and Kubernetes markers, and verified that infrastructure detection is skipped when application code is present. ✨ Result: Improved test coverage and reliability for project type detection.

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PR created automatically by Jules for task 13607139929629558778 started by @arvarik

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