fix(cli): migrate setup model/provider pickers off simple_term_menu to curses

The setup provider->model sub-menu (and three sibling pickers) used
simple_term_menu.TerminalMenu, whose ESC and arrow-key handling was
unreliable across terminals — notably ESC failed to back out of the
model selection list on terminals that emit raw escape sequences (e.g.
Ghostty). The codebase already notes simple_term_menu 'conflicts with
/dev/tty' and causes 'ghost-duplication rendering', and a prior attempt
to migrate these (closed PR) confirmed the same root cause.

Route all four single-select pickers through the shared, already-hardened
curses_radiolist (which decodes raw CSI/SS3 escape sequences and handles
ESC consistently, fixed in #35776):

- auth.py _prompt_model_selection — model picker; the pricing column
  header and the unavailable-models block are passed as the radiolist
  description so they survive the curses screen clear. ESC now cancels.
- main.py _prompt_reasoning_effort_selection — reasoning-effort picker.
- main.py _model_flow_named_custom — named custom-provider model picker.
- main.py _remove_custom_provider — provider-removal picker.

simple_term_menu is no longer imported anywhere (only stale comments
referenced it; one in setup.py is corrected). The numbered-input
fallbacks are unchanged and still trigger on curses errors / non-TTY.

Tests: updated test_terminal_menu_fallbacks / test_reasoning_effort_menu
/ test_custom_provider_model_switch / test_model_provider_persistence to
drive the fallback via curses_radiolist errors instead of breaking
simple_term_menu. New test_setup_menu_curses_migration.py asserts each
picker routes through curses_radiolist, ESC cancels, and the pricing
header is preserved. Net -147/+183 (mostly the new test file; production
code shrinks by removing TerminalMenu boilerplate).

tests/hermes_cli/test_terminal_menu_fallbacks.py

@@ -1,25 +1,21 @@
-"""Regression tests for numbered fallbacks when TerminalMenu cannot initialize."""
+"""Regression tests for numbered fallbacks when the interactive curses menu
+cannot initialize (e.g. non-TTY, curses unavailable, terminal error)."""
 
 import subprocess
-import sys
-import types
 
 from hermes_cli.config import load_config, save_config
 
 
-class _BrokenTerminalMenu:
-    def __init__(self, *args, **kwargs):
-        raise subprocess.CalledProcessError(2, ["tput", "clear"])
+def _raise_menu(*args, **kwargs):
+    # Mimic curses_radiolist hitting an unrecoverable terminal error so the
+    # caller's except clause routes to the numbered-input fallback.
+    raise subprocess.CalledProcessError(2, ["tput", "clear"])
 
 
-def test_prompt_model_selection_falls_back_on_terminalmenu_runtime_error(monkeypatch):
+def test_prompt_model_selection_falls_back_on_menu_runtime_error(monkeypatch):
     from hermes_cli.auth import _prompt_model_selection
 
-    monkeypatch.setitem(
-        sys.modules,
-        "simple_term_menu",
-        types.SimpleNamespace(TerminalMenu=_BrokenTerminalMenu),
-    )
+    monkeypatch.setattr("hermes_cli.curses_ui.curses_radiolist", _raise_menu)
     responses = iter(["2"])
     monkeypatch.setattr("builtins.input", lambda _prompt="": next(responses))
 
@@ -28,14 +24,10 @@ def test_prompt_model_selection_falls_back_on_terminalmenu_runtime_error(monkeyp
     assert selected == "model-b"
 
 
-def test_prompt_reasoning_effort_falls_back_on_terminalmenu_runtime_error(monkeypatch):
+def test_prompt_reasoning_effort_falls_back_on_menu_runtime_error(monkeypatch):
     from hermes_cli.main import _prompt_reasoning_effort_selection
 
-    monkeypatch.setitem(
-        sys.modules,
-        "simple_term_menu",
-        types.SimpleNamespace(TerminalMenu=_BrokenTerminalMenu),
-    )
+    monkeypatch.setattr("hermes_cli.curses_ui.curses_radiolist", _raise_menu)
     responses = iter(["3"])
     monkeypatch.setattr("builtins.input", lambda _prompt="": next(responses))
 
@@ -44,15 +36,11 @@ def test_prompt_reasoning_effort_falls_back_on_terminalmenu_runtime_error(monkey
     assert selected == "high"
 
 
-def test_remove_custom_provider_falls_back_on_terminalmenu_runtime_error(tmp_path, monkeypatch):
+def test_remove_custom_provider_falls_back_on_menu_runtime_error(tmp_path, monkeypatch):
     from hermes_cli.main import _remove_custom_provider
 
     monkeypatch.setenv("HERMES_HOME", str(tmp_path))
-    monkeypatch.setitem(
-        sys.modules,
-        "simple_term_menu",
-        types.SimpleNamespace(TerminalMenu=_BrokenTerminalMenu),
-    )
+    monkeypatch.setattr("hermes_cli.curses_ui.curses_radiolist", _raise_menu)
 
     cfg = load_config()
     cfg["custom_providers"] = [
@@ -72,15 +60,11 @@ def test_remove_custom_provider_falls_back_on_terminalmenu_runtime_error(tmp_pat
     ]
 
 
-def test_named_custom_provider_model_picker_falls_back_on_terminalmenu_runtime_error(tmp_path, monkeypatch):
+def test_named_custom_provider_model_picker_falls_back_on_menu_runtime_error(tmp_path, monkeypatch):
     from hermes_cli.main import _model_flow_named_custom
 
     monkeypatch.setenv("HERMES_HOME", str(tmp_path))
-    monkeypatch.setitem(
-        sys.modules,
-        "simple_term_menu",
-        types.SimpleNamespace(TerminalMenu=_BrokenTerminalMenu),
-    )
+    monkeypatch.setattr("hermes_cli.curses_ui.curses_radiolist", _raise_menu)
     monkeypatch.setattr("hermes_cli.models.fetch_api_models", lambda *args, **kwargs: ["model-a", "model-b"])
     monkeypatch.setattr("hermes_cli.auth.deactivate_provider", lambda: None)