feat(F1): configure syslog audit logging for vigilar.alerts

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/unit/test_syslog_config.py

@@ -0,0 +1,7 @@
+"""Test syslog handler configuration for alerts logger."""
+
+
+def test_alerts_logger_name():
+    from vigilar.alerts.sender import log as alerts_log
+
+    assert alerts_log.name == "vigilar.alerts"