refactor: Standardize agent naming to TestEngineer and fix permissions #63

Job	Run time
Bash Syntax Validation	4s
ShellCheck Analysis	10s
Non-Interactive Mode Tests (macos-latest)	54s
End-to-End Installation Tests (ubuntu-latest)	1m 30s
End-to-End Installation Tests (macos-latest)	2m 43s
Compatibility Tests (ubuntu-latest)	17s
Compatibility Tests (macos-latest)	46s
Non-Interactive Mode Tests (ubuntu-latest)	30s
Profile Installation Smoke Test (advanced)	32s
Profile Installation Smoke Test (business)	12s
Profile Installation Smoke Test (developer)	30s
Profile Installation Smoke Test (essential)	10s
Profile Installation Smoke Test (full)	27s
Installer Checks Summary	4s
	8m 49s

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