1. Adds AgentMessage, Reasoning, WebSearch items. 2. Switches the ResponseItem parsing to use new items and then also emit 3. Removes user-item kind and filters out "special" (environment) user items when returning to clients.
codex-protocol
This crate defines the "types" for the protocol used by Codex CLI, which includes both "internal types" for communication between codex-core and codex-tui, as well as "external types" used with codex app-server.
This crate should have minimal dependencies.
Ideally, we should avoid "material business logic" in this crate, as we can always introduce Ext-style traits to add functionality to types in other crates.