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New docs/RESTORE_DRILL_ROUTINE.md introduces a three-stage model: weekly freshness check, monthly/bimonthly mini-restores, quarterly DR sanity check. Tracks confirmed mini-restores (Vaultwarden, Gitea, Paperless 2026-05-07; Immich 2026-05-27) and rotates services by quarter Q1-Q4. Includes ten-point DR sanity check and abort rules that point at the drift runbook. No host schedule is created; the existing ops/restore-tests/schedule.md now references this routine as the source for quarterly assignment. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>