🧪 Add tests for printConfigUsageAndExit

[Hardonian]

🎯 What: The testing gap addressed: added unit tests for printConfigUsageAndExit in src/lib/commands/sandbox/config/get.ts which was previously untested.

📊 Coverage: What scenarios are now tested:

• Properly calls console.error with the expected usage message containing the CLI_NAME variable and dynamic command arguments.
• Exits the process with status code 1.

✨ Result: The improvement in test coverage: Increased unit test coverage for the configuration CLI commands by covering the edge case error handler. It ensures the command provides correct feedback and terminates properly.

Signed-off-by: Jules jules@example.com

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PR created automatically by Jules for task 630263640935547288 started by @Hardonian

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