Print warning if we skip config loading (#9611)

https://github.com/openai/codex/pull/9533 silently ignored config if
untrusted. Instead, we still load it but disable it. Maybe we shouldn't
try to parse it either...

<img width="939" height="515" alt="Screenshot 2026-01-21 at 14 56 38"
src="https://github.com/user-attachments/assets/e753cc22-dd99-4242-8ffe-7589e85bef66"
/>

codex-rs/core/src/config/service.rs

@@ -4,6 +4,7 @@ use crate::config::edit::ConfigEdit;
 use crate::config::edit::ConfigEditsBuilder;
 use crate::config_loader::ConfigLayerEntry;
 use crate::config_loader::ConfigLayerStack;
+use crate::config_loader::ConfigLayerStackOrdering;
 use crate::config_loader::ConfigRequirementsToml;
 use crate::config_loader::LoaderOverrides;
 use crate::config_loader::load_config_layers_state;
@@ -171,7 +172,7 @@ impl ConfigService {
             origins: layers.origins(),
             layers: params.include_layers.then(|| {
                 layers
-                    .layers_high_to_low()
+                    .get_layers(ConfigLayerStackOrdering::HighestPrecedenceFirst, true)
                     .iter()
                     .map(|layer| layer.as_layer())
                     .collect()