Workspace lints and disallow unwrap (#855)

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-rs/tui/src/app.rs

@@ -107,7 +107,7 @@ impl App<'_> {
     pub(crate) fn run(&mut self, terminal: &mut tui::Tui) -> Result<()> {
         // Insert an event to trigger the first render.
         let app_event_tx = self.app_event_tx.clone();
-        app_event_tx.send(AppEvent::Redraw).unwrap();
+        app_event_tx.send(AppEvent::Redraw)?;
 
         while let Ok(event) = self.app_event_rx.recv() {
             match event {
@@ -128,7 +128,7 @@ impl App<'_> {
                             modifiers: crossterm::event::KeyModifiers::CONTROL,
                             ..
                         } => {
-                            self.app_event_tx.send(AppEvent::ExitRequest).unwrap();
+                            self.app_event_tx.send(AppEvent::ExitRequest)?;
                         }
                         _ => {
                             self.dispatch_key_event(key_event);

codex-rs/tui/src/lib.rs

@@ -2,7 +2,6 @@
 // The standalone `codex-tui` binary prints a short help message before the
 // alternate‑screen mode starts; that file opts‑out locally via `allow`.
 #![deny(clippy::print_stdout, clippy::print_stderr)]
-
 use app::App;
 use codex_core::config::Config;
 use codex_core::config::ConfigOverrides;