Bump version from 1.5.0 to 1.6.0 in __init__.py and pyproject.toml.
Update test_cli_version_flag to assert against the current package
version instead of a hardcoded string.
- Treat empty list from fetch_issues_with_spent_time as 'no entries' and exit 0
instead of crashing later in the pipeline.
- Update CLI output-extension tests to use non-empty mock data so they actually
reach the extension validation code path.
- Add openpyxl to mypy ignore_missing_imports overrides.
Closes#36
- #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
