#34 Extract test suite execution helpers

[iray-tno]

Summary

• move suite language detection, case discovery, preprocessing, compile-once, and run helpers into src/commands/test_suite.py
• keep src/commands/test_command.py focused on Click wiring and legacy single-case test paths
• preserve existing CLI behavior and output

Closes #34

Tests

• python -m py_compile src/commands/test_command.py src/commands/test_scoring.py src/commands/test_suite.py
• uv run pytest tests/test_test_command.py -q
• uv run pytest -q