schengen-clock@1.0.0

Publisher claims: "Use when you travel (or plan travel) to Europe on a non-EU passport and must respect the Schengen 90/180 rule — a rolling window where any 180-day stretch allows at most 90 days of presence. Parses passport stamps / stay history, computes presence per rolling window, finds the current maximum allowed stay on any entry date, projects forward (can I add this trip?), flags the classic overstay traps (5-day overstay from poor counting, back-to-back long stays, the day-of-entry-counts rule), and generates a border-interview-ready itinerary letter. For tourists/visitors — doesn't handle residence permits, long-stay visas, or working-holiday schemes." Observed in sandbox: no network, touches nothing outside the project, writes no memory.