Remove dirs fallback from config expansion

codex-rs/core/src/config_loader/expansion.rs

@@ -1,7 +1,6 @@
 use std::collections::BTreeSet;
 use std::collections::HashMap;
 
-use dirs::home_dir;
 use serde_json::json;
 use toml::Value as TomlValue;
 
@@ -56,9 +55,6 @@ pub(crate) fn expand_key_for_matching_with_env(key: &str, env: &impl EnvProvider
         if let Some(home) = env.get(home_var) {
             return home;
         }
-        if let Some(home) = home_dir() {
-            return home.to_string_lossy().to_string();
-        }
         return key.to_string();
     }
     let mut warnings = Vec::new();