added tests for pwd

[mishushakov]

No description provided.

[cursor]

PR Summary

Low Risk
Low risk because this PR only adds new test coverage and does not change runtime or sandbox behavior.

Overview
Adds new test suites in js/tests/cwd.test.ts and Python (python/tests/sync/test_cwd.py, python/tests/async/test_async_cwd.py) to verify cwd resolves to /home/user when running code in Python, JavaScript/TypeScript, R, and Java.

All new tests are skipped in debug mode to avoid environment-dependent failures.

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