[Tcode-Motion]

🎯 What: Extracted mutex function definitions from register_sync into helper functions make_mutex_fn, mutex_lock_fn, and mutex_unlock_fn in stdlib/src/sync.rs.
💡 Why: register_sync was excessively long due to inline function implementations, harming maintainability and readability.
✅ Verification: Verified with cargo test -p techscript_stdlib and workspace test suite cargo test --workspace --all-targets.
✨ Result: Reduced register_sync function length from over 80 lines to 15 lines, improving readability while preserving identical runtime functionality.

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PR created automatically by Jules for task 11909712293175888048 started by @Tcode-Motion

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