chore: enusre the logic that creates ConfigLayerStack has access to cwd (#8353)

`load_config_layers_state()` should load config from a
`.codex/config.toml` in any folder between the `cwd` for a thread and
the project root. Though in order to do that,
`load_config_layers_state()` needs to know what the `cwd` is, so this PR
does the work to thread the `cwd` through for existing callsites.

A notable exception is the `/config` endpoint in app server for which a
`cwd` is not guaranteed to be associated with the query, so the `cwd`
param is `Option<AbsolutePathBuf>` to account for this case.

The logic to make use of the `cwd` will be done in a follow-up PR.

codex-rs/cli/src/main.rs

@@ -44,6 +44,7 @@ use codex_core::features::Feature;
 use codex_core::features::FeatureOverrides;
 use codex_core::features::Features;
 use codex_core::features::is_known_feature_key;
+use codex_utils_absolute_path::AbsolutePathBuf;
 
 /// Codex CLI
 ///
@@ -687,7 +688,13 @@ async fn is_tui2_enabled(cli: &TuiCli) -> std::io::Result<bool> {
         .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidInput, e))?;
 
     let codex_home = find_codex_home()?;
-    let config_toml = load_config_as_toml_with_cli_overrides(&codex_home, cli_kv_overrides).await?;
+    let cwd = cli.cwd.clone();
+    let config_cwd = match cwd.as_deref() {
+        Some(path) => AbsolutePathBuf::from_absolute_path(path)?,
+        None => AbsolutePathBuf::current_dir()?,
+    };
+    let config_toml =
+        load_config_as_toml_with_cli_overrides(&codex_home, &config_cwd, cli_kv_overrides).await?;
     let config_profile = config_toml.get_config_profile(cli.config_profile.clone())?;
     let overrides = FeatureOverrides::default();
     let features = Features::from_config(&config_toml, &config_profile, overrides);