test(v2-ingestion): harden public-source schema contract and docs

tests/test_import_snapshots_command.py

@@ -138,6 +138,36 @@ def test_snapshot_import_succeeds_with_optional_bio_and_physical_fields_missing(
     assert PlayerSeasonStats.objects.count() == 1
 
 
+@pytest.mark.django_db
+def test_snapshot_import_preserves_single_name_part_without_forced_split(tmp_path, settings):
+    incoming = tmp_path / "incoming"
+    archive = tmp_path / "archive"
+    failed = tmp_path / "failed"
+    incoming.mkdir()
+    archive.mkdir()
+    failed.mkdir()
+
+    payload = _valid_payload()
+    row = payload["records"][0]
+    row["first_name"] = "LeBron"
+    row.pop("last_name")
+
+    file_path = incoming / "single-name-part.json"
+    _write_json(file_path, payload)
+
+    settings.STATIC_DATASET_INCOMING_DIR = str(incoming)
+    settings.STATIC_DATASET_ARCHIVE_DIR = str(archive)
+    settings.STATIC_DATASET_FAILED_DIR = str(failed)
+
+    call_command("import_snapshots")
+
+    run = ImportRun.objects.get()
+    assert run.status == ImportRun.RunStatus.SUCCESS
+    player = Player.objects.get(source_uid="player-23")
+    assert player.first_name == "LeBron"
+    assert player.last_name == ""
+
+
 @pytest.mark.django_db
 @pytest.mark.parametrize(
     ("source_name", "competition_id", "competition_name"),