🧪 [Add test for ScriptMutex::new]

[Tcode-Motion]

🎯 What: Added a unit test for the ScriptMutex::new constructor in stdlib/src/sync.rs.
📊 Coverage: Now covers the initial state logic ensuring that the locked property is correctly initialized to false.
✨ Result: Increased test coverage in the sync module by proving that ScriptMutex::new() correctly instantiates an initially unlocked mutex.

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PR created automatically by Jules for task 1282998859698790391 started by @Tcode-Motion

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