chore: clean imports and restore test coverage

tests/test_config.py

@@ -37,7 +37,6 @@ Architecture:
 import pytest
 import yaml
 
-from voice_assistant.config.loader import load_config
 from voice_assistant.config.loader import (
     load_config,
     load_provider_catalog,
@@ -167,7 +166,7 @@ def test_load_provider_catalog_missing_file(tmp_path):
         )
 
 
-def test_load_config_uses_app_env(
+def test_load_config_uses_development_app_env(
     tmp_path,
     monkeypatch,
 ):
@@ -220,7 +219,7 @@ def test_load_config_rejects_unknown_environment(
             config_dir=tmp_path,
         )
 
-def test_load_config_uses_app_env(
+def test_load_config_uses_staging_app_env(
     tmp_path,
     monkeypatch,
 ):
@@ -273,16 +272,3 @@ agent:
 
     assert config.agent.provider == "mock"
 
-
-def test_load_config_rejects_unknown_environment(
-    tmp_path,
-):
-    with pytest.raises(
-        FileNotFoundError,
-        match="Configuration file not found",
-    ):
-        load_config(
-            environment="does-not-exist",
-            config_dir=tmp_path,
-        )
-