opentui(phase3): launcher integration — HERMES_TUI_ENGINE dual-engine

hermes --tui launches the native OpenTUI engine (Bun) when
HERMES_TUI_ENGINE=opentui (env) or display.tui_engine=opentui (config);
Ink stays the default and the shipping path is untouched.

- _resolve_tui_engine() (env > config > ink); refuses opentui on
  Windows/Termux (no Bun) -> falls back to ink with a notice.
- _make_opentui_argv() -> [bun, src/entry.real.tsx] (no build step).
- _bun_bin() with HERMES_BUN override.
- Branch at top of _make_tui_argv BEFORE _ensure_tui_node (Bun-only host
  must not bootstrap Node).
- Gate _launch_tui NODE_OPTIONS/--max-old-space-size on engine==ink (Bun
  is JSC; the V8 flag errors/ignores).

Verified end-to-end via tmux: real hermes --tui -> Bun -> OpenTUI ->
real Python gateway streamed a real reply. No-flag default still ink.

agent/agent_init.py

@@ -169,7 +169,6 @@ def init_agent(
     save_trajectories: bool = False,
     verbose_logging: bool = False,
     quiet_mode: bool = False,
-    tool_progress_mode: str = "all",
     ephemeral_system_prompt: str = None,
     log_prefix_chars: int = 100,
     log_prefix: str = "",
@@ -187,7 +186,6 @@ def init_agent(
     thinking_callback: callable = None,
     reasoning_callback: callable = None,
     clarify_callback: callable = None,
-    read_terminal_callback: callable = None,
     step_callback: callable = None,
     stream_delta_callback: callable = None,
     interim_assistant_callback: callable = None,
@@ -282,7 +280,6 @@ def init_agent(
     agent.save_trajectories = save_trajectories
     agent.verbose_logging = verbose_logging
     agent.quiet_mode = quiet_mode
-    agent.tool_progress_mode = tool_progress_mode
     agent.ephemeral_system_prompt = ephemeral_system_prompt
     agent.platform = platform  # "cli", "telegram", "discord", "whatsapp", etc.
     agent._user_id = user_id  # Platform user identifier (gateway sessions)
@@ -418,7 +415,6 @@ def init_agent(
     agent.thinking_callback = thinking_callback
     agent.reasoning_callback = reasoning_callback
     agent.clarify_callback = clarify_callback
-    agent.read_terminal_callback = read_terminal_callback
     agent.step_callback = step_callback
     agent.stream_delta_callback = stream_delta_callback
     agent.interim_assistant_callback = interim_assistant_callback