🧪 [testing improvement] Add test for std.barcode module registration

[Tcode-Motion]

🎯 What: Added a missing unit test for the register_barcode function in stdlib/src/barcode.rs.
📊 Coverage: Now validates that the std.barcode module correctly registers in StdlibRegistry with the correct module name "std.barcode", version "1.0.0", and 0 required capabilities.
✨ Result: Improved test coverage for module registration in the standard library.

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PR created automatically by Jules for task 11085327934280741115 started by @Tcode-Motion

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