[Tcode-Motion]

🎯 What:
Added unit tests for the register_parallel function and parallel module callables (num_cpus, run, sleep) in stdlib/src/parallel.rs.

📊 Coverage:

• std.parallel module registration and metadata verification
• Exported functions existence (run, sleep, num_cpus)
• Callable execution for num_cpus returning valid CPU count >= 1
• Callable execution for run returning RuntimeValue::Null
• Callable execution for sleep returning RuntimeValue::Null

✨ Result:
Ensured register_parallel and its exported standard library functions are thoroughly covered by automated tests, preventing potential regressions in parallel execution bindings.

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PR created automatically by Jules for task 10888424222094382043 started by @Tcode-Motion

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