[Tcode-Motion]

🎯 What: Refactored register_sync in stdlib/src/sync.rs by extracting inline callable definitions (make_mutex, mutex_lock, mutex_unlock) into standalone helper functions (make_mutex_fn, mutex_lock_fn, mutex_unlock_fn).

💡 Why: register_sync was overly long and contained inline closure logic for each standard library sync function, making it difficult to maintain and read. Splitting them into standalone helper functions improves modularity, readability, and maintainability.

✅ Verification: Verified by running cargo fmt --all, cargo test -p techscript_stdlib --lib sync, and cargo test --workspace --all-targets to confirm formatting and that all unit tests pass without regressions.

✨ Result: A cleaner, modular register_sync implementation with clear separation of individual function definitions.

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PR created automatically by Jules for task 792880337896425182 started by @Tcode-Motion

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