[Tcode-Motion]

• 💡 What: Implemented a dedicated dup() method on ValueStack to perform value stack duplication in a single pass, replacing separate peek() and push() calls in Opcode::Dup.
• 🎯 Why: In the VM execution loop, Opcode::Dup was executing two separate stack operations (peek() and push()), incurring multiple bounds checks and error wrapping overhead.
• 📊 Impact: Direct stack manipulation in dup() eliminates redundant stack layer abstractions and double-checking during bytecode execution.
• 🔬 Measurement: Confirmed through workspace tests and benchmarks.

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PR created automatically by Jules for task 6902341027270731600 started by @Tcode-Motion

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