Restructure `pathway-system` This does a lot of restructuring: - adds `pathway-compat-*` libs for multi-layer wrappers over `base`, `directory`, and `filepath`; - adds `variant`-based open sum types for recovering `IO` errors; and - has `pathway-system` depend on the new `pathway-compat-*` packages.
| Time to Start | Worker time | Duration | Time to finish | |
| Config | 0s | 2s | 2s | 3s |
| Eval | 2s | 4m10s | 4m10s | 4m12s |
| Build | 1m17s | 14m52s | 5m50s | 7m08s |
| Test | - | - | - | - |
| Deploy | - | - | - | - |
| Suite | 0s | 19m04s | 7m07s | 7m08s |