🧹 [code health improvement for sys.rs closures]

[Tcode-Motion]

🎯 What: Extracted inline closures for system and file operations (read_file, write_file, exists, now, sleep) into top-level standalone functions (read_file_fn, write_file_fn, etc.) within stdlib/src/sys.rs.
💡 Why: Reduces massive setup boilerplate in the register_sys method, making the module initialization more readable. It also clearly isolates capability checking from the registry setup logic.
✅ Verification: Visually verified the changes to the extracted functions. Ran cargo check -p techscript_stdlib, cargo fmt --all, and cargo test --workspace --all-targets to ensure no functionality is broken and format is intact.
✨ Result: Improved maintainability and readability of sys.rs without any change in existing behavior.

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PR created automatically by Jules for task 8975675422364690956 started by @Tcode-Motion

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