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/exec/src/lib.rs

@@ -421,11 +421,6 @@ pub async fn run_main(cli: Cli, arg0_paths: Arg0DispatchPaths) -> anyhow::Result
             .cloud_config_bundle(gate_cloud_config.clone())
             .build()
             .await?;
-        if !gate_config.features.enabled(Feature::Worktrees) {
-            anyhow::bail!(
-                "--worktree requires the worktrees feature; enable it with --enable worktrees"
-            );
-        }
         if let Some(ExecCommand::Fork(args)) = command.as_mut() {
             let saved_cwd = worktree::fork_source(
                 args,

codex-rs/exec/tests/suite/worktree.rs

@@ -407,35 +407,17 @@ fn worktree_rejects_remote_defaults_before_allocation() -> anyhow::Result<()> {
 }
 
 #[test]
-fn worktree_rejects_disabled_features_and_ignored_config_before_allocation() -> anyhow::Result<()> {
-    for (config, args, expected) in [
-        (
-            "",
-            vec!["--ignore-user-config", "prompt"],
-            "--worktree cannot be combined with --ignore-user-config",
-        ),
-        (
-            "features.worktrees = false",
-            vec!["prompt"],
-            "--enable worktrees",
-        ),
-        (
-            "features.worktrees = false",
-            vec!["fork", "missing"],
-            "--enable worktrees",
-        ),
-        (
-            "features.worktrees = true",
-            vec!["-c", "features.worktrees=false", "prompt"],
-            "--enable worktrees",
-        ),
-    ] {
-        let test = test_codex_exec();
-        fs::write(test.home_path().join("config.toml"), config)?;
-        let output = test.cmd().arg("--worktree").args(args).output()?;
-        assert!(!output.status.success());
-        assert!(String::from_utf8_lossy(&output.stderr).contains(expected));
-        assert!(!test.home_path().join("worktrees").exists());
-    }
+fn worktree_rejects_ignored_config_before_allocation() -> anyhow::Result<()> {
+    let test = test_codex_exec();
+    let output = test
+        .cmd()
+        .args(["--worktree", "--ignore-user-config", "prompt"])
+        .output()?;
+    assert!(!output.status.success());
+    assert!(
+        String::from_utf8_lossy(&output.stderr)
+            .contains("--worktree cannot be combined with --ignore-user-config")
+    );
+    assert!(!test.home_path().join("worktrees").exists());
     Ok(())
 }