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/dashboard/templates/registry.html

@@ -66,6 +66,15 @@
 </div>
 {{end}}
 
+{{define "registry_level"}}
+<div class="level">
+<span class="level-name">{{.Name}}</span>
+{{if .L.Total}}<span class="stat stat-{{.L.Class}}">{{.L.OK}} из {{.L.Total}}</span>
+<span class="level-types">{{range .L.ByType}}<span class="chip chip-{{.Class}}">{{.Type}} {{.OK}} из {{.Total}}</span>{{end}}</span>
+{{else}}<span class="stat stat-none">—</span>{{end}}
+</div>
+{{end}}
+
 {{define "registry_table"}}
 {{if .Items}}
 <div class="panel">
@@ -85,6 +94,10 @@
 {{else if eq .LastResult "fail"}}<span class="pill pill-danger">fail</span>
 {{else if eq .LastResult "cancelled"}}<span class="pill pill-cancel">cancelled</span>
 {{else}}<span class="pill pill-neutral">—</span>{{end}}
+{{if .LastCycleID}}<div class="levels" title="Считаются записанные проверки цикла {{.LastCycleID}}; вердикт учитывает ещё и недостающие результаты.">
+{{template "registry_level" dict "Name" "Egress" "L" .Egress}}
+{{template "registry_level" dict "Name" "Ingress" "L" .Ingress}}
+</div>{{end}}
 </td>
 <td data-label="Сейчас в очереди">
 {{if .InQueue}}<span class="pill pill-info">{{.CurrentState}}</span>{{else}}<span class="pill pill-neutral">нет</span>{{end}}