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_config_field.py

@@ -0,0 +1,56 @@
+from pyra.plugins.base import BasePlugin, ConfigField
+
+
+def test_config_field_minimal():
+    f = ConfigField("mykey", "My Label", "text")
+    assert f.key == "mykey"
+    assert f.label == "My Label"
+    assert f.type == "text"
+    assert f.default == ""
+    assert f.options == []
+    assert f.description == ""
+
+
+def test_config_field_options_are_independent():
+    f1 = ConfigField("k", "L", "select")
+    f2 = ConfigField("k", "L", "select")
+    f1.options.append("x")
+    assert f2.options == [], "options lists must not be shared between instances"
+
+
+def test_config_field_all_args():
+    f = ConfigField("url", "API URL", "select", "http://a.com", ["opt1", "opt2"], "hint text")
+    assert f.default == "http://a.com"
+    assert f.options == ["opt1", "opt2"]
+    assert f.description == "hint text"
+
+
+def test_config_field_bool_type():
+    f = ConfigField("enabled", "Enable feature", "bool", True)
+    assert f.type == "bool"
+    assert f.default is True
+
+
+def test_base_plugin_config_fields_returns_empty():
+    assert BasePlugin().config_fields() == []
+
+
+def test_plugin_subclass_config_fields_override():
+    class MyPlugin(BasePlugin):
+        name = "test"
+        description = "test plugin"
+        version = "1.0"
+
+        def config_fields(self):
+            return [
+                ConfigField("api_url", "API URL", "text", "http://example.com"),
+                ConfigField("verify_ssl", "Verify SSL", "bool", True),
+            ]
+
+    fields = MyPlugin().config_fields()
+    assert len(fields) == 2
+    assert fields[0].key == "api_url"
+    assert fields[0].type == "text"
+    assert fields[1].key == "verify_ssl"
+    assert fields[1].type == "bool"
+    assert fields[1].default is True