🧹 Remove backup file src/GameUtils/Procedural/Diamond.cs.orig

[johnstrand]

🎯 What: Removed leftover backup file src/GameUtils/Procedural/Diamond.cs.orig from version control.\n💡 Why: Backup files (.orig) are generated by merge tools or formatters and should not be committed to version control.\n✅ Verification: Deleted file, verified directory contents, and confirmed all unit tests pass.\n✨ Result: Cleaned up project repository hygiene.

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PR created automatically by Jules for task 6491820613020389373 started by @johnstrand

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