test(s52): cover build_notifier console/file dispatch + file-without-path fail-fast

tests/test_notify.py

@@ -132,6 +132,21 @@ def test_config_fail_fast() -> None:
     assert isinstance(notifier, WebhookNotifier)
 
 
+def test_build_notifier_dispatches_console_and_file(tmp_path) -> None:
+    """Factory-glue coverage (the units are tested above): the console and file branches return
+    the right notifier types, and a file config without a path is rejected at CONSTRUCTION
+    (guards ``_required_fields_by_type`` — the ``assert config.path is not None`` in
+    ``build_notifier`` is unreachable by construction). RED only if dispatch/validator break —
+    e.g. the file branch returning ConsoleNotifier flips the isinstance."""
+    assert isinstance(build_notifier(NotifierConfig(type="console")), ConsoleNotifier)
+    assert isinstance(
+        build_notifier(NotifierConfig(type="file", path=str(tmp_path / "out.jsonl"))),
+        FileNotifier,
+    )
+    with pytest.raises(ValidationError):
+        NotifierConfig(type="file")  # path missing → model_validator raises
+
+
 def test_webhook_config_rejects_schemeless_url() -> None:
     """Fail-fast scheme gate (S5.2 remediation): a scheme-less webhook url is rejected at config
     construction — BEFORE it can reach ``_urllib_post``, whose bare ``ValueError`` would carry the