87cf120873
Sets submodules to use workspace lints. Added denying unwrap as a workspace level lint, which found a couple of cases where we could have propagated errors. Also manually labeled ones that were fine by my eye.
codex-common
This crate is designed for utilities that need to be shared across other crates in the workspace, but should not go in core.
For narrow utility features, the pattern is to add introduce a new feature under [features] in Cargo.toml and then gate it with #[cfg] in lib.rs, as appropriate.