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-pager/tests/pty_e2e_smoke.rs

@@ -17,6 +17,8 @@ mod auto_compact_top_row;
 mod basename_path_demo_pty;
 #[path = "pty_e2e/doubled_lines_out_of_band_repro.rs"]
 mod doubled_lines_out_of_band_repro;
+#[path = "pty_e2e/embedded_mode_boots_without_hanging_on_blocked_backend.rs"]
+mod embedded_mode_boots_without_hanging_on_blocked_backend;
 #[path = "pty_e2e/initial_prompt_positional_auto_submits.rs"]
 mod initial_prompt_positional_auto_submits;
 #[path = "pty_e2e/input_echoes_at_idle_prompt.rs"]