CRITICAL: Disable Newman CI workflows due to supply chain attack

[quiet-node]

Issue

The newman package has been compromised in a supply chain attack. All CI workflows using Newman must be disabled immediately to prevent execution of potentially malicious code.

Action Taken

• All CI workflows containing Newman have been disabled
• Newman execution paths have been commented out with security warnings
• DO NOT UPDATE newman package

Next Steps

• Identify and evaluate secure alternatives to Newman for API testing
• Update CI workflows with the chosen alternative
• Remove Newman dependency once replacement is verified