feat(setup): auto-reconfigure on existing installs (#15879)

Bare `hermes setup` on a returning user now drops straight into the
full reconfigure wizard — every prompt shows the current value as its
default, press Enter to keep or type a new value to change it. The
returning-user menu is gone.

Behavior:
- First-time user: first-time wizard (unchanged)
- Returning user, bare command: full reconfigure wizard (new default)
- Returning user, `--quick`: only prompt for missing/unset items
- Returning user, one section: `hermes setup model|terminal|gateway|tools|agent`
- `--reconfigure`: preserved as backwards-compat alias (no-op since it's now default)

The section functions already used current values as prompt defaults —
this change just removes the extra click to get to them.

The 'Quick Setup - configure missing items only' menu option is now
exposed as the explicit `--quick` flag; it's the narrow case of
filling in missing config (e.g. after a partial OpenClaw migration or
when a required API key got cleared).

Inspired by Mercury Agent's `mercury doctor` UX.

Also removes:
- RETURNING_USER_MENU_SECTION_KEYS (orphaned constant)
- Two returning-user menu tests in test_setup_noninteractive.py
  (guarding behavior that no longer exists — covered by
  test_setup_reconfigure.py instead)

tests/hermes_cli/test_setup_noninteractive.py

@@ -144,91 +144,6 @@ class TestNonInteractiveSetup:
         out = capsys.readouterr().out
         assert "hermes config set model.provider custom" in out
 
-    def test_returning_user_terminal_menu_choice_dispatches_terminal_section(self, tmp_path):
-        """Returning-user menu should map Terminal Backend to the terminal setup, not TTS."""
-        from hermes_cli import setup as setup_mod
-
-        args = _make_setup_args()
-        config = {}
-        model_section = MagicMock()
-        tts_section = MagicMock()
-        terminal_section = MagicMock()
-        gateway_section = MagicMock()
-        tools_section = MagicMock()
-        agent_section = MagicMock()
-
-        with (
-            patch.object(setup_mod, "ensure_hermes_home"),
-            patch.object(setup_mod, "load_config", return_value=config),
-            patch.object(setup_mod, "get_hermes_home", return_value=tmp_path),
-            patch.object(setup_mod, "is_interactive_stdin", return_value=True),
-            patch.object(
-                setup_mod,
-                "get_env_value",
-                side_effect=lambda key: "sk-test" if key == "OPENROUTER_API_KEY" else "",
-            ),
-            patch("hermes_cli.auth.get_active_provider", return_value=None),
-            patch.object(setup_mod, "prompt_choice", return_value=3),
-            patch.object(
-                setup_mod,
-                "SETUP_SECTIONS",
-                [
-                    ("model", "Model & Provider", model_section),
-                    ("tts", "Text-to-Speech", tts_section),
-                    ("terminal", "Terminal Backend", terminal_section),
-                    ("gateway", "Messaging Platforms (Gateway)", gateway_section),
-                    ("tools", "Tools", tools_section),
-                    ("agent", "Agent Settings", agent_section),
-                ],
-            ),
-            patch.object(setup_mod, "save_config"),
-            patch.object(setup_mod, "_print_setup_summary"),
-        ):
-            setup_mod.run_setup_wizard(args)
-
-        terminal_section.assert_called_once_with(config)
-        tts_section.assert_not_called()
-
-    def test_returning_user_menu_does_not_show_separator_rows(self, tmp_path):
-        """Returning-user menu should only show selectable actions."""
-        from hermes_cli import setup as setup_mod
-
-        args = _make_setup_args()
-        captured = {}
-
-        def fake_prompt_choice(question, choices, default=0):
-            captured["question"] = question
-            captured["choices"] = list(choices)
-            return len(choices) - 1
-
-        with (
-            patch.object(setup_mod, "ensure_hermes_home"),
-            patch.object(setup_mod, "load_config", return_value={}),
-            patch.object(setup_mod, "get_hermes_home", return_value=tmp_path),
-            patch.object(setup_mod, "is_interactive_stdin", return_value=True),
-            patch.object(
-                setup_mod,
-                "get_env_value",
-                side_effect=lambda key: "sk-test" if key == "OPENROUTER_API_KEY" else "",
-            ),
-            patch("hermes_cli.auth.get_active_provider", return_value=None),
-            patch.object(setup_mod, "prompt_choice", side_effect=fake_prompt_choice),
-        ):
-            setup_mod.run_setup_wizard(args)
-
-        assert captured["question"] == "What would you like to do?"
-        assert "---" not in captured["choices"]
-        assert captured["choices"] == [
-            "Quick Setup - configure missing items only",
-            "Full Setup - reconfigure everything",
-            "Model & Provider",
-            "Terminal Backend",
-            "Messaging Platforms (Gateway)",
-            "Tools",
-            "Agent Settings",
-            "Exit",
-        ]
-
     def test_main_accepts_tts_setup_section(self, monkeypatch):
         """`hermes setup tts` should parse and dispatch like other setup sections."""
         from hermes_cli import main as main_mod