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Purely additive; the controller path (reports/customer_configs/checkAuthCustomer/ existing checkers) is untouched. Cutover remains slice 10. - store: new hosts/guests/host_reports tables (full schema incl. columns INERT until slice 10, so no later ALTER); GetHostByAPIKey/GetHost/ListHosts/UpsertHost/ SaveHostReport/UpsertGuestFromReport (preserves inert cols)/GetHostStaleness/ GuestID; Prune also prunes host_reports. - api: checkAuthHost (sibling of checkAuthCustomer); POST /host-report (per-host Bearer, 4MiB, denorm + guest upsert, control envelope); POST /admin/hosts (PROVISIONAL global-key host mint); host_* event types registered. - monitor: HostStalenessChecker sibling over host_reports (host_stale/down/ recovered), wired on the existing 60s ticker; controller checkers unchanged. - tests (hermetic): store intent/inert-column preservation, auth, ingest (envelope+denorm, mismatch/unknown/blocked/oversize), admin mint round-trip, host staleness transitions. CHANGELOG v0.7.0. Contract matches the agent host-report spec field-for-field. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>