chore(tui) debug-config guardian_policy_config (#18923)

## Summary
List guardian_policy_config_source in `/debug-config` output

## Testing
 - [x] Ran locally

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

@@ -1565,6 +1565,7 @@ impl Config {
             enforce_residency,
             network: network_requirements,
             filesystem: filesystem_requirements,
+            guardian_policy_config_source: _,
         } = config_layer_stack.requirements().clone();
 
         let user_instructions = AgentsMdManager::load_global_instructions(Some(&codex_home))