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We need an issue-style instruction that covers the same change but removes all internal implementation…

We need an issue-style instruction that covers the same change but removes all internal implementation…: a task in LegoFlow-SWE (Harbor dataset). Title: Process::exe() , Process::cwd() and Process::root() should return Option<&Path to clearly indicate missing information

The task

**Title:** `Process::exe()`, `Process::cwd()` and `Process::root()` should return `Option<&Path>` to clearly indicate missing information

Part of Lego-X/LegoFlow-SWE.