feat: remote compaction (#6795)

Co-authored-by: pakrym-oai <pakrym@openai.com>

codex-rs/core/src/features.rs

@@ -46,6 +46,8 @@ pub enum Feature {
     SandboxCommandAssessment,
     /// Enable Windows sandbox (restricted token) on Windows.
     WindowsSandbox,
+    /// Remote compaction enabled (only for ChatGPT auth)
+    RemoteCompaction,
     /// Enable the default shell tool.
     ShellTool,
 }
@@ -305,6 +307,12 @@ pub const FEATURES: &[FeatureSpec] = &[
         stage: Stage::Experimental,
         default_enabled: false,
     },
+    FeatureSpec {
+        id: Feature::RemoteCompaction,
+        key: "remote_compaction",
+        stage: Stage::Experimental,
+        default_enabled: false,
+    },
     FeatureSpec {
         id: Feature::ShellTool,
         key: "shell_tool",