`typed-builder` and `derive_builder` are both used

Should we stick to one builder crate instead?

The issue names `typed-builder` and `derive_builder` but no files or tests. Start by locating all uses of both builder crates across the repository, then compare their roles and maintenance implications. Done means selecting one crate and updating the affected uses consistently, with validation that the repository still builds and tests pass.

Written by the indexing model from the issue text.