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Phase-1 of SPIKE-infra-backup-2026-06-15. The infra-backup mechanism was dead since slice 8C yet stored plaintext customer secrets at rest (app-secret key, restic password, Cloudflare tokens) — a zero-knowledge violation — and its absence made the daily expected_backup_missed email fire for healthy customers. - Repoint monitor.CheckBackupDeadlines backup half to the agent host-report's PBS snapshots (+vzdump): alarm only on no-backup / >26h stale / verify failed. Keep the db_dump half. No host-report → no backup alarm (liveness owns that). New store.GetLatestHostReportJSON. Tests incl. a companion that fails pre-fix. - Remove the infra-backup endpoints, store methods/types, and operator panel; /recovery now returns config_yaml only. - migrate(): DROP infra_backup_versions/infra_backups + VACUUM (+wal_checkpoint) to physically reclaim the plaintext pages, gated on table existence. Flagged out-of-scope: exposed creds need operator rotation; legacy reports table holds historical plaintext restic_password rows (separate leak, not purged here). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>