Release build warns about unused EventMsg import in tui

What version of Codex is running?

0.0.0

Which model were you using?

n/a

What platform is your computer?

Linux 6.15.6-arch1-1 x86_64 unknown (btw)

What steps can reproduce the bug?

cargo build --release

What is the expected behavior?

Build with no warning.

What do you see instead?

warning: unused import: `codex_core::protocol::EventMsg`
  --> tui/src/app.rs:14:5
   |
14 | use codex_core::protocol::EventMsg;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default

Additional information

_No response_