feat: JSON, Excel export and time summary

- #23: add JSONFormatter and XLSXFormatter
- add openpyxl dependency for .xlsx export
- #22: add --summary flag and calculate_summary() in report_builder
- ReportRow now carries raw hours for summary calculations
- update CLI help and README with .json/.xlsx formats and --summary
- add tests for new formatters and summary computation

Closes #22, closes #23

tests/test_cli.py

@@ -170,6 +170,18 @@ def test_cli_config_file_loading(mock_fetch, tmp_path):
     assert code == 0
 
 
+@mock.patch.dict(os.environ, VALID_ENV, clear=True)
+@mock.patch("redmine_reporter.cli.fetch_issues_with_spent_time")
+def test_cli_summary_flag_prints_totals(mock_fetch, capsys):
+    """--summary выводит общее время и разбивку по проектам в stderr."""
+    issue = _MockIssue()
+    mock_fetch.return_value = [(issue, 1.0)]
+    main(["--date", "2026-01-01--2026-01-31", "--summary"])
+    captured = capsys.readouterr()
+    assert "Total time" in captured.err
+    assert "Project" in captured.err or "Project" in captured.out
+
+
 @mock.patch.dict(os.environ, VALID_ENV, clear=True)
 @mock.patch("redmine_reporter.cli.fetch_issues_with_spent_time")
 def test_total_issues_message_goes_to_stderr(mock_fetch, capsys):