v0.246.0: an interrupted restore is told; the recovery-code reminder waits until the box can take it

MinAgent: 0.131.0 (unchanged). Requires hub v0.117.0 for restore_interrupted.

R-550 (operator ruling: fix). A design reversed and recorded: the restore
op-status was in memory by choice. Now restore-status.json in DataDir, written
atomically at both ends of an op. At startup a record still marked running
becomes a failed, interrupted result kept per app until that app's next
restore, shown on /backups/restore and the off-site wizard, and raised once as
restore_interrupted. Cooldowns stay in memory.

R-546. The R-543 reminder bar consults the agent's own preflight ok (every
blocking item, not a copy of pbs_storage_id), cached 60 s, probed only while
paused. /backup/escrow shows a waiting card that polls and reloads instead of
red crosses and English diagnostics. POST /api/escrow/start refuses 409 before
staging or starting - the direct path chaos night used. Unknown readiness keeps
the bar.

Red-proofs (each seen failing): restore record across restart; main() calls
both startup functions; startup helper with loading skipped; restore page card;
bar held back; waiting card; start refusal. go build/vet/test ./... green, 28
packages; controller_gates --fast all OK.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

controller/internal/web/templates/backups_restore.html

@@ -7,6 +7,18 @@
 </div>
 
 {{template "backups_flash" .}}
+
+{{with .InterruptedRestores}}
+<!-- R-550: a restore the box was running when it stopped. Persisted, so it survives the restart that
+     interrupted it; shown until that app's next restore. -->
+<div class="settings-card">
+    <h3>Megszakadt visszaállítás</h3>
+    {{range .}}
+    <div class="alert alert-error"><strong>{{.Stack}}</strong>: {{.Message}}</div>
+    {{end}}
+    <p class="form-hint">A doboz újraindult, miközben a visszaállítás futott, ezért nem tudjuk, hogy befejeződött-e. Indítsd el újra lent, ugyanabból a mentésből.</p>
+</div>
+{{end}}
 {{template "restore_banner" .}}
 
 {{if not .Backup}}