Retire worktree and voice feature flags (#54175)

## What changed

- Remove feature-flag checks from managed worktree creation and repository-aware session discovery, while retaining local workspace and trust checks.
- Make TUI voice availability follow platform support instead of `features.realtime_conversation`.
- Ignore `features.worktrees` and `features.realtime_conversation` configuration overrides, warn when managed requirements reference them, and hide both flags from `/experimental`, including catalogs from older servers.

## Testing

Add coverage for ignored configuration overrides and managed requirements, and update session filtering, worktree grouping, and experimental feature discovery tests for the retired flags.

GitOrigin-RevId: 1d64e890e6e2f8a78926a9ea163126c0890b068e

codex-rs/features/src/lib.rs

@@ -214,7 +214,7 @@ pub enum Feature {
     NetworkProxy,
     /// Mask credentials and inject them through an already enabled network proxy.
     CredentialMasking,
-    /// Enable managed worktree creation and repository-aware sessions.
+    /// Removed compatibility flag. Managed worktrees and repository-aware sessions are always available.
     Worktrees,
     /// Respect host system proxy settings for Codex-owned network clients.
     RespectSystemProxy,
@@ -416,7 +416,7 @@ pub enum Feature {
     UltrafastMode,
     /// Enable explicitly requested model changes for later step captures.
     StepModelSwitching,
-    /// Enable voice conversations in the TUI.
+    /// Removed compatibility flag. TUI voice availability follows platform support.
     RealtimeConversation,
     /// Prevent idle system sleep while a turn is actively running.
     PreventIdleSleep,
@@ -667,7 +667,7 @@ impl Features {
                     self.record_legacy_usage_force("features.transcript_v2", Feature::TranscriptV2);
                     continue;
                 }
-                "tui_app_server" => {
+                "tui_app_server" | "worktrees" | "realtime_conversation" => {
                     continue;
                 }
                 "undo" => {
@@ -1453,7 +1453,7 @@ pub const FEATURES: &[FeatureSpec] = &[
     FeatureSpec {
         id: Feature::Worktrees,
         key: "worktrees",
-        stage: Stage::Stable,
+        stage: Stage::Removed,
         default_enabled: true,
     },
     FeatureSpec {
@@ -1999,7 +1999,7 @@ pub const FEATURES: &[FeatureSpec] = &[
     FeatureSpec {
         id: Feature::RealtimeConversation,
         key: "realtime_conversation",
-        stage: Stage::Stable,
+        stage: Stage::Removed,
         default_enabled: true,
     },
     FeatureSpec {

codex-rs/features/src/tests.rs

@@ -901,3 +901,22 @@ code_mode = true
         message
     );
 }
+
+#[test]
+fn retired_worktree_and_voice_config_overrides_are_ignored() {
+    for enabled in [false, true] {
+        let features_toml = FeaturesToml::from(BTreeMap::from([
+            ("worktrees".to_string(), enabled),
+            ("realtime_conversation".to_string(), enabled),
+        ]));
+        let features = Features::from_sources(
+            FeatureConfigSource {
+                features: Some(&features_toml),
+                ..Default::default()
+            },
+            FeatureConfigSource::default(),
+            FeatureOverrides::default(),
+        );
+        assert_eq!(features, Features::with_defaults());
+    }
+}