Currently persist_to_workspace requires listing every path explicitly, and attach_workspace attaches everything persisted upstream with no way to select a subset.

Glob support would help in monorepos where build outputs follow predictable patterns. Currently this will silently omit a new subpath if it is not manually included in the config.

Named keys enable a flaky test rerun to attach only the prior build's workspace layer and skip rebuilding entirely, which isn't possible today since workspaces have no identity.