Synced from monorepo

Changes:
- Detect the herdr multiplexer
- Mark /gboom as non-production code
- Bound peak memory when loading a large session
- Add a subagent lifecycle soak bounding threads, fds, and heap
- Stream inherited replay to bound fork memory
- Copy full plan from plan approval with y
- Stop armed signature verification from deleting the managed-deny smoke policy
- Add source-tagged terminal version telemetry
- Show the UI instantly and fetch models and settings in the background
- Session test helpers
- computer_reason on the ConversationHistoryDone trailer

crates/codegen/xai-grok-shell/src/remote/mod.rs

@@ -24,7 +24,7 @@ pub use chat_models_client::{
     ChatModelsClient, ChatModelsError, ListModesResponse, Mode, ModeAvailability,
 };
 pub use client::{
-    BackendClient, BackendError, FetchModelsResult, FetchedBundle, fetch_bundle,
+    BackendClient, BackendError, FetchModelsResult, FetchedBundle, SettingsFetch, fetch_bundle,
     fetch_login_device_flow, fetch_settings_blocking, fetch_subagent_bundle, share_url,
 };
 pub(crate) use client::{DEFAULT_CONTEXT_WINDOW, fetch_models_blocking, models_list_url};