fix: make the TUI the default/"interactive" CLI in Rust (#711)

Originally, the `interactive` crate was going to be a placeholder for
building out a UX that was comparable to that of the existing TypeScript
CLI. Though after researching how Ratatui works, that seems difficult to
do because it is designed around the idea that it will redraw the full
screen buffer each time (and so any scrolling should be "internal" to
your Ratatui app) whereas the TypeScript CLI expects to render the full
history of the conversation every time(*) (which is why you can use your
terminal scrollbar to scroll it).

While it is possible to use Ratatui in a way that acts more like what
the TypeScript CLI is doing, it is awkward and seemingly results in
tedious code, so I think we should abandon that approach. As such, this
PR deletes the `interactive/` folder and the code that depended on it.

Further, since we added support for mousewheel scrolling in the TUI in
https://github.com/openai/codex/pull/641, it certainly feels much better
and the need for scroll support via the terminal scrollbar is greatly
diminished. This is now a more appropriate default UX for the
"multitool" CLI.

(*) Incidentally, I haven't verified this, but I think this results in
O(N^2) work in rendering, which seems potentially problematic for long
conversations.

codex-rs/cli/src/main.rs

@@ -7,7 +7,6 @@ use clap::ArgAction;
 use clap::Parser;
 use codex_core::SandboxModeCliArg;
 use codex_exec::Cli as ExecCli;
-use codex_interactive::Cli as InteractiveCli;
 use codex_repl::Cli as ReplCli;
 use codex_tui::Cli as TuiCli;
 
@@ -25,7 +24,7 @@ use crate::proto::ProtoCli;
 )]
 struct MultitoolCli {
     #[clap(flatten)]
-    interactive: InteractiveCli,
+    interactive: TuiCli,
 
     #[clap(subcommand)]
     subcommand: Option<Subcommand>,
@@ -37,10 +36,6 @@ enum Subcommand {
     #[clap(visible_alias = "e")]
     Exec(ExecCli),
 
-    /// Run the TUI.
-    #[clap(visible_alias = "t")]
-    Tui(TuiCli),
-
     /// Run the REPL.
     #[clap(visible_alias = "r")]
     Repl(ReplCli),
@@ -89,14 +84,11 @@ async fn main() -> anyhow::Result<()> {
 
     match cli.subcommand {
         None => {
-            codex_interactive::run_main(cli.interactive).await?;
+            codex_tui::run_main(cli.interactive)?;
         }
         Some(Subcommand::Exec(exec_cli)) => {
             codex_exec::run_main(exec_cli).await?;
         }
-        Some(Subcommand::Tui(tui_cli)) => {
-            codex_tui::run_main(tui_cli)?;
-        }
         Some(Subcommand::Repl(repl_cli)) => {
             codex_repl::run_main(repl_cli).await?;
         }