Untether's validation stage — answer "is this validated enough for its risk?" Classify the target + risk, pick the lightest sufficient depth (QA-0..QA-5), run local checks, and (opt-in) orchestrate the integration-test tiers against the allowlisted @untether_dev_bot. Files capped findings, routes repair to /debug→/fix, writes the attestation marker on green. Defaults to plan/dry-run. Never fixes, merges, tags, releases, or rolls the fleet.