Multi-Country Day-Count Tracker (183-Day, Midnight-Rule & Weighted Presence)

Deterministic Multi-jurisdiction presence-day boolean predicates (00:00 local midnight vs any-minute UTC touch vs 3-yr weighted sum D_0 + D_1/3 + D_2/6) engine (.ics, .csv, .json, .pdf) built for Flighty, TripIt, Garmin, Google Timeline — zero-upload ephemeral Wasm RAM execution.

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