975372a6

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.

Tree Timing

Agent Instructions

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