Update full-auto description with on-request (#6523)

This PR fixes #6522 by correcting the comment for `full-auto` in both
`codex-rs/exec/src/cli.rs` and `codex-rs/tui/src/cli.rs` from `-a
on-failure` to `-a on-request` to make it coherent with
`codex-rs/tui/src/lib.rs:97-105`:

```rust
pub async fn run_main(
    mut cli: Cli,
    codex_linux_sandbox_exe: Option<PathBuf>,
) -> std::io::Result<AppExitInfo> {
    let (sandbox_mode, approval_policy) = if cli.full_auto {
        (
            Some(SandboxMode::WorkspaceWrite),
            Some(AskForApproval::OnRequest),
        )
```

Running `just codex --help` or `just codex exec --help` should now yield
the correct description of `full-auto` CLI argument.

Signed-off-by: lionelchg <[email protected]>

Author: lionelchg

codex-rs/exec/src/cli.rs

@@ -30,7 +30,7 @@ pub struct Cli {
     #[arg(long = "profile", short = 'p')]
     pub config_profile: Option<String>,
 
-    /// Convenience alias for low-friction sandboxed automatic execution (-a on-failure, --sandbox workspace-write).
+    /// Convenience alias for low-friction sandboxed automatic execution (-a on-request, --sandbox workspace-write).
     #[arg(long = "full-auto", default_value_t = false)]
     pub full_auto: bool,
 

codex-rs/tui/src/cli.rs

@@ -51,7 +51,7 @@ pub struct Cli {
     #[arg(long = "ask-for-approval", short = 'a')]
     pub approval_policy: Option<ApprovalModeCliArg>,
 
-    /// Convenience alias for low-friction sandboxed automatic execution (-a on-failure, --sandbox workspace-write).
+    /// Convenience alias for low-friction sandboxed automatic execution (-a on-request, --sandbox workspace-write).
     #[arg(long = "full-auto", default_value_t = false)]
     pub full_auto: bool,