Show egress/ingress levels in the registry; freeze checks at the verdict

Registry: the "last result" column now also shows, per level (egress,
ingress), how many of the recorded checks of the latest cycle succeeded, split
by check family (tcp-22 and tcp-443 are both "tcp"). One grouped query per
chunk of addresses; new fields last_cycle_id, egress, ingress in
GET /admin/registry; the dashboard renders them under the verdict.

Verdict integrity (migration 0010):
- the prober is handed an address once per site and attempt, not on every
  poll, so results are no longer overwritten by later probe rounds;
- UpsertCheckIfOpen refuses writes once the address is aggregating or has its
  verdict, or for an older attempt; senders get {"ok":true,"ignored":N} and a
  result_dropped event is recorded;
- the checking window counts from checking_started_at, not from assigned_at;
- checks.recorded_at (server clock) and checks.after_verdict (flag for rows
  written after the verdict in existing data);
- the verdict rule is a pure function (computeVerdict) and the aggregated
  event carries the egress/ingress check counts.

Rebuilt bin/control-api and bin/admin-dashboard to match. Plans and summaries
are in docs/changes; README, API, USAGE, DASHBOARD and DIAGRAMS are updated.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/httpapi/handlers_registry.go

@@ -82,5 +82,16 @@ func registrySummaryToDTO(s db.RegistrySummary) registryDTO {
 		LastCheckedAt: s.LastCheckedAt,
 		InQueue:       s.InQueue,
 		CurrentState:  s.CurrentState,
+		LastCycleID:   s.LastCycleID,
+		Egress:        levelResultToDTO(s.Egress),
+		Ingress:       levelResultToDTO(s.Ingress),
 	}
 }
+
+func levelResultToDTO(l db.LevelResult) levelResultDTO {
+	out := levelResultDTO{Total: l.Total, OK: l.OK, ByType: make([]typeStatDTO, len(l.ByType))}
+	for i, t := range l.ByType {
+		out.ByType[i] = typeStatDTO{Type: t.Type, Total: t.Total, OK: t.OK}
+	}
+	return out
+}