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/time/cron_test.py

@@ -56,5 +56,5 @@ def test_custom_start_time():
 
 
 def test_invalid_cron_expression():
-    with pytest.raises(Exception):
+    with pytest.raises((ValueError, KeyError)):
         Cron("invalid expression")

test/core/time/time_format_settings_test.py

@@ -0,0 +1,44 @@
+import pytest
+from cpl.core.time.time_format_settings import TimeFormatSettings
+
+
+def test_defaults_are_none():
+    s = TimeFormatSettings()
+    assert s.date_format is None
+    assert s.time_format is None
+    assert s.date_time_format is None
+    assert s.date_time_log_format is None
+
+
+def test_constructor_sets_all_fields():
+    s = TimeFormatSettings(
+        date_format="%Y-%m-%d",
+        time_format="%H:%M:%S",
+        date_time_format="%Y-%m-%d %H:%M:%S",
+        date_time_log_format="%Y-%m-%d %H:%M:%S.%f",
+    )
+    assert s.date_format == "%Y-%m-%d"
+    assert s.time_format == "%H:%M:%S"
+    assert s.date_time_format == "%Y-%m-%d %H:%M:%S"
+    assert s.date_time_log_format == "%Y-%m-%d %H:%M:%S.%f"
+
+
+def test_setters_update_values():
+    s = TimeFormatSettings()
+    s.date_format = "%d/%m/%Y"
+    s.time_format = "%I:%M %p"
+    s.date_time_format = "%d/%m/%Y %I:%M %p"
+    s.date_time_log_format = "%d/%m/%Y %H:%M:%S.%f"
+    assert s.date_format == "%d/%m/%Y"
+    assert s.time_format == "%I:%M %p"
+    assert s.date_time_format == "%d/%m/%Y %I:%M %p"
+    assert s.date_time_log_format == "%d/%m/%Y %H:%M:%S.%f"
+
+
+def test_partial_construction():
+    # TimeFormatSettings uses constructor args, not option()/from_src()
+    s = TimeFormatSettings(date_format="%Y/%m/%d")
+    assert s.date_format == "%Y/%m/%d"
+    assert s.time_format is None
+    assert s.date_time_format is None
+    assert s.date_time_log_format is None