feat(normalizer): add main() CLI to persons_tree

Wires the two-pass pipeline (parse → deduplicate → index → resolve)
into a runnable CLI with --input, --output, and --dry-run flags.

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

tools/import-normalizer/tests/test_persons_tree.py

@@ -431,3 +431,27 @@ def test_parse_bemerkung_sohn_with_trailing_remark():
     assert len(rels) == 2
     assert unres == []
     assert notes == "nach Mexiko emigriert"
+
+
+import subprocess
+
+
+def test_dry_run_exits_zero(tmp_path):
+    """dry-run should complete without writing any file and exit 0."""
+    input_path = Path(__file__).parent.parent.parent.parent / "import" / "Personendatei 2.xlsx"
+    if not input_path.exists():
+        import pytest
+        pytest.skip("source Excel file not present")
+
+    result = subprocess.run(
+        [
+            sys.executable, str(Path(__file__).parent.parent / "persons_tree.py"),
+            "--input", str(input_path),
+            "--output", str(tmp_path / "out.json"),
+            "--dry-run",
+        ],
+        capture_output=True, text=True,
+    )
+    assert result.returncode == 0, result.stderr
+    assert not (tmp_path / "out.json").exists()
+    assert "persons parsed" in result.stdout