fix(tui): Update WSL instructions (#5307)

## Summary
Clearer and more complete WSL instructions in our shell message.

## Testing
- [x] Tested locally

---------

Co-authored-by: Josh McKinney <joshka@openai.com>

codex-rs/tui/src/onboarding/windows.rs

@@ -19,13 +19,25 @@ use crate::onboarding::onboarding_screen::StepStateProvider;
 
 use super::onboarding_screen::StepState;
 
-pub(crate) const WSL_INSTRUCTIONS: &str = r"Install WSL2 by opening PowerShell as Administrator and running:
-
+pub(crate) const WSL_INSTRUCTIONS: &str = r#"Install WSL2 by opening PowerShell as Administrator and running:
+    # Install WSL using the default Linux distribution (Ubuntu).
+    # See https://learn.microsoft.com/en-us/windows/wsl/install for more info
     wsl --install
 
-Instructions for how to install and run Codex in WSL:
+    # Restart your computer, then start a shell inside of Windows Subsystem for Linux
+    wsl
 
-    https://developers.openai.com/codex/windows";
+    # Install Node.js in WSL via nvm
+    # Documentation: https://learn.microsoft.com/en-us/windows/dev-environment/javascript/nodejs-on-wsl
+    curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/master/install.sh | bash && export NVM_DIR="$HOME/.nvm" && \. "$NVM_DIR/nvm.sh"
+    nvm install 22
+
+    # Install and run Codex in WSL
+    npm install --global @openai/codex
+    codex
+
+    # Additional details and instructions for how to install and run Codex in WSL:
+    https://developers.openai.com/codex/windows"#;
 
 pub(crate) struct WindowsSetupWidget {
     pub codex_home: PathBuf,
@@ -84,8 +96,10 @@ impl WidgetRef for &WindowsSetupWidget {
         let mut lines: Vec<Line> = vec![
             Line::from(vec![
                 "> ".into(),
-                "For best performance, run Codex in Windows Subsystem for Linux (WSL2)".bold(),
+                "To use all Codex features, we recommend running Codex in Windows Subsystem for Linux (WSL2)".bold(),
             ]),
+            Line::from(vec!["  ".into(), "WSL allows Codex to run Agent mode in a sandboxed environment with better data protections in place.".into()]),
+            Line::from(vec!["  ".into(), "Learn more: https://developers.openai.com/codex/windows".into()]),
             Line::from(""),
         ];