test(core): extend coverage — console, errors, log, service, time, benchmark

Add missing test modules for previously untested core areas:
- console: ForegroundColorEnum, BackgroundColorEnum, Console methods
- errors: dependency_error, module_dependency_error
- log: LogLevel ordering/values, LogSettings, Logger (should_log, format, file write, fatal)
- service: HostedService, StartupTask, CronjobABC (start/stop/loop/task cancellation)
- time: TimeFormatSettings properties and setters
- utils: Benchmark.time / .memory / .all call-count and output

Also fix existing test files: environment cleanup, cron exception specificity,
json_processor kwargs bug doc, configuration_model_abc to_dict bug doc.
All 199 tests pass, black clean.

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

test/core/configuration/configuration_test.py

@@ -29,6 +29,7 @@ def clear_config():
 
 # --- set / get ---
 
+
 def test_set_and_get_by_class():
     settings = AppSettings({"app_name": "TestApp", "version": "1.0.0"})
     Configuration.set(AppSettings, settings)
@@ -73,6 +74,7 @@ def test_multiple_models():
 
 # --- add_json_file ---
 
+
 def test_add_json_file_loads_model(tmp_path):
     config_data = {"AppSettings": {"app_name": "FromFile", "version": "2.0.0"}}
     config_file = tmp_path / "appsettings.json"
@@ -91,9 +93,7 @@ def test_add_json_file_not_found_exits(tmp_path):
 
 
 def test_add_json_file_optional_missing_returns_none(tmp_path):
-    result = Configuration.add_json_file(
-        str(tmp_path / "missing.json"), optional=True, output=False
-    )
+    result = Configuration.add_json_file(str(tmp_path / "missing.json"), optional=True, output=False)
     assert result is None