chore: drop approve all (#5503)

Not needed anymore

codex-rs/core/src/features.rs

@@ -39,8 +39,6 @@ pub enum Feature {
     ViewImageTool,
     /// Allow the model to request web searches.
     WebSearchRequest,
-    /// Automatically approve all approval requests from the harness.
-    ApproveAll,
 }
 
 impl Feature {
@@ -238,10 +236,4 @@ pub const FEATURES: &[FeatureSpec] = &[
         stage: Stage::Stable,
         default_enabled: false,
     },
-    FeatureSpec {
-        id: Feature::ApproveAll,
-        key: "approve_all",
-        stage: Stage::Experimental,
-        default_enabled: false,
-    },
 ];