check-ip and geoip no longer use it; formmailer now takes
*atomic.Pointer[ipcohort.Cohort] for Blacklist so callers own the
refresh + swap lifecycle directly. gitshallow doc comments that
referenced dataset.Syncer are trimmed.
The concepts the package tried to share (atomic-swap, group sync,
ticker-driven refresh) may come back under sync/dataset once we have
more than one in-tree caller that wants them.
Remove View[T] — Add now returns *Dataset[T] directly. Callers use Load()
on the returned Dataset; Init/Run belong to the owning Group.
main.go simplified: declare syncer + file paths per case, then one
g.Init() and one g.Run(). No manual loops over individual datasets.
Add gitshallow.Repo.FilePath helper.
Rewrite from feat-formmailer WIP:
- Blacklist is *dataset.View[ipcohort.Cohort] — caller wires dataset group
- http.Handler via ServeHTTP — drop-in for any mux
- SuccessBody/ErrorBody []byte — caller loads files; no file I/O per request
- Rate limiter per-instance (sync.Once init), not global
- Fields configurable (default standard names, not GravityForms input_N)
- AllowedCountries []string for geo-blocking via iploc (nil = allow all)
- ContainsAddr used directly (pre-parsed netip.Addr, no re-parse)
- No Init()/Run() — caller drives dataset lifecycle
- Fix getErrorBotty typo; expose support email only to legitimate errors
