Linux build and runtime failures after dispatch‑806 merge

Linux build and runtime failures after dispatch‑806 merge: a task in LegoFlow-SWE (Harbor dataset). After merging the dispatch‑806 branch, the project no longer compiles, links, or runs on Linux. Several portability problems have been introduced that prevent the library and its tests from working…

The task

After merging the `dispatch‑806` branch, the project no longer compiles, links, or runs on Linux. Several portability problems have been introduced that prevent the library and its tests from working on this platform.

Part of Lego-X/LegoFlow-SWE.