Retire the daemon_auto_start feature flag (#58940)

## What changed

Eligible interactive launches now start or reuse the shared daemon regardless of `features.daemon_auto_start`. Remote-control daemon eligibility also no longer checks this flag. Use `--no-daemon` to run without the shared background server.

Treat `daemon_auto_start` as removed: ignore configured values with a migration notice, ignore managed requirements with a warning, and hide the flag from experimental feature discovery. Remove its launch telemetry tag.

## Testing

Extend retired-feature requirement coverage and add a migration-notice snapshot. Update CLI and TUI integration tests for daemon startup and explicit `--no-daemon` usage.

GitOrigin-RevId: e0290e5acd4bc0169a0f71c3296c567e46269ce3

codex-rs/cli/src/remote_control_cmd.rs

@@ -16,7 +16,6 @@ use codex_app_server_protocol::RemoteControlPairingStartResponse;
 use codex_arg0::Arg0DispatchPaths;
 use codex_config::LoaderOverrides;
 use codex_core::config::ConfigBuilder;
-use codex_features::Feature;
 use codex_protocol::protocol::SessionSource;
 use codex_utils_absolute_path::AbsolutePathBuf;
 use codex_utils_cli::CliConfigOverrides;
@@ -161,8 +160,7 @@ async fn daemon_eligible(root_config_overrides: &CliConfigOverrides) -> anyhow::
     let Ok(config) = ConfigBuilder::default().build().await else {
         return Ok(false);
     };
-    Ok(config.features.enabled(Feature::DaemonAutoStart)
-        && !codex_tui::uses_wsl_drvfs(&config.codex_home))
+    Ok(!codex_tui::uses_wsl_drvfs(&config.codex_home))
 }
 
 fn print_remote_control_progress(json: bool, message: &str) -> anyhow::Result<()> {

codex-rs/cli/tests/daemon_startup.rs

@@ -40,7 +40,7 @@ async fn agents_checks_trust_when_starting_after_dismissing_overview() -> Result
 
 #[tokio::test]
 #[cfg(unix)]
-async fn discovered_managed_daemon_can_restart_with_auto_start_disabled() -> Result<()> {
+async fn discovered_managed_daemon_can_restart() -> Result<()> {
     daemon_startup("discovered").await
 }
 
@@ -194,8 +194,10 @@ async fn daemon_startup(command: &str) -> Result<()> {
          {}\n\
          notice.model_migrations.\"gpt-5.6-terra\" = \"gpt-6-sol\"\n\
          [projects.{}]\ntrust_level = \"{}\"\n",
-            if command == "discovered" {
-                "tui.status_line=[\"model\",\"thread-id\",\"thread-name\"]\nfeatures.daemon_auto_start=false"
+            if command == "start" {
+                "features.daemon_auto_start=false"
+            } else if command == "discovered" {
+                "tui.status_line=[\"model\",\"thread-id\",\"thread-name\"]"
             } else if bedrock_onboarding {
                 "features.gcp_setup_wizard=false"
             } else {
@@ -321,7 +323,6 @@ async fn daemon_startup(command: &str) -> Result<()> {
             }
             "entercontinue·escback"
         } else if command == "discovered" {
-            args.extend(["--disable".into(), "daemon_auto_start".into()]);
             // Empty drafts need not survive a daemon restart. Renaming materializes the
             // thread; wait for the confirmed footer name, not the echoed command.
             steps.push_back(("GPT-5.6-Terra", b"/rename daemon-restart-test\r"));

codex-rs/cli/tests/worktree.rs

@@ -192,7 +192,6 @@ cli_auth_credentials_store = "file"
 chatgpt_base_url = "{}/source/backend-api"
 analytics.enabled = false
 check_for_update_on_startup = false
-features.daemon_auto_start = {}
 features.mcp_oauth_refresh_coordination = true
 model_provider = "local"
 model = "test-model"
@@ -211,7 +210,6 @@ trust_level = "trusted"
 trust_level = "trusted"
 "#,
             server.uri(),
-            backend == "daemon",
             server.uri(),
             serde_json::to_string(&source)?,
             serde_json::to_string(&launcher)?
@@ -390,6 +388,9 @@ trust_level = "trusted"
             .mount(&server)
             .await;
         let mut args = worktree_args.clone();
+        if backend == "embedded" && !analytics {
+            args.push("--no-daemon".into());
+        }
         if backend == "daemon" && previous.is_empty() {
             args.extend(["-c".into(), "features.auth_elicitation=true".into()]);
         }
@@ -698,14 +699,6 @@ trust_level = "trusted"
                 ("terminal_rows", "40-79"),
                 ("multiplexer", "none"),
                 ("daemon_selection_reason", "incompatible_option"),
-                (
-                    "daemon_auto_start",
-                    if backend == "daemon" {
-                        "enabled"
-                    } else {
-                        "disabled"
-                    },
-                ),
                 ("auto_update", "enabled"),
                 ("auto_update_setting", "default"),
                 ("update_interval_setting", "default"),