Evaluation timing result consistency

Execution time of many commands (like `sort`) depend on locale variables (for example, `LC_CTYPE`). To guarantee consistent evaluation results even across different users on the same machine (!) we need to make sure that `LC_CTYPE` and all other locale variables are equal.

No file, test, or entry point is named. Start by tracing how PaSh launches and evaluates commands, then identify where locale variables are inherited or set. Done means evaluation results are consistent when users on the same machine have different locale settings, with coverage for commands such as sort.

Written by the indexing model from the issue text.