test: add coverage for config TUI, ConfigField, schema changes, and CLI auto-setup

- test_config.py: GeneralConfig defaults, plugin_settings round-trip
- test_config_field.py: ConfigField dataclass, BasePlugin.config_fields() no-op,
  plugin subclass override
- test_config_tui.py: _get/_set_nested, _fid/_pfid helpers, GENERAL_FIELDS validity,
  ConfigApp general tab rendering, save handler, plugins table, plugin tab visibility,
  q key exit — using Textual run_test() + Pilot
- test_cli.py: auto-setup wizard on first run, skip wizard when config exists,
  /config in _STATIC_COMMANDS

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/unit/test_cli.py

@@ -107,3 +107,33 @@ def test_daemon_commands_exit_cleanly(tmp_pyra_home):
     for cmd in ["start", "stop", "status", "restart"]:
         result = runner.invoke(main, ["daemon", cmd])
         assert result.exit_code == 0, f"daemon {cmd} exited with {result.exit_code}"
+
+
+def test_main_calls_setup_wizard_when_no_config(tmp_pyra_home, monkeypatch):
+    setup_calls = []
+    monkeypatch.setattr("pyra.setup.wizard.run_setup", lambda: setup_calls.append(1))
+    monkeypatch.setattr("pyra.chat.session.start_chat", lambda: None)
+
+    runner = CliRunner()
+    runner.invoke(main, [])
+
+    assert len(setup_calls) == 1, "run_setup should be called once when no config exists"
+
+
+def test_main_skips_setup_when_config_exists(tmp_pyra_home, monkeypatch):
+    from pyra.config.manager import save_config
+    save_config(_make_config())
+
+    setup_calls = []
+    monkeypatch.setattr("pyra.setup.wizard.run_setup", lambda: setup_calls.append(1))
+    monkeypatch.setattr("pyra.chat.session.start_chat", lambda: None)
+
+    runner = CliRunner()
+    runner.invoke(main, [])
+
+    assert len(setup_calls) == 0, "run_setup should NOT be called when config already exists"
+
+
+def test_config_slash_command_registered():
+    from pyra.chat.session import _STATIC_COMMANDS
+    assert "/config" in _STATIC_COMMANDS