[Tcode-Motion]

🎯 What: Missing tests for register_image and image stdlib functions (open, resize, grayscale).
📊 Coverage: Tests registration of std.image module, module exports (open, resize, grayscale), correct arities, image opening success and failure modes, image resizing, and grayscale conversion.
✨ Result: Ensures register_image and std.image functions are fully covered and verified against regressions.

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PR created automatically by Jules for task 18068505713427454404 started by @Tcode-Motion

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