Registers one point alarm per CSV row (recipientId, lat, lng, radius) with the shared filter JSON and the existing webhook bootstrap, records status, httpStatus, registrationId and errorBody back into the CSV and recovers ambiguous failures only on an identical recipient, point and radius match.
Adds point_alarm.py (flattening, secret masking, SQLite upsert store, paged fetch with 403 fallback, CSV/TXT export, shared filter loader), nowcast-point-page.py CLI and unit tests. Register will read the shared filter from nowcast-point-alarm-filter.json instead of repeating it in the CSV.