Get a privacy-minimized sandbox property management summary

Returns a deterministic privacy-minimized aggregate sandbox property-management and MCST summary when the authenticated automation client has property_management.units.read. External URL: /v1/property-management/current/summary. Current Next.js implementation path: /api/platform/v1/property-management/current/summary. This read-only route does not require Idempotency-Key and never exposes exact units or strata lots, addresses, resident, owner, or tenant identity, contact details, vendor identity or commercial details, raw notices or incidents, budgets or levies, access-control data, credentials, write controls, exports, or live property-management integrations. Estate-operator review remains required; all unit, resident, maintenance, notice, incident, vendor, payment, levy, budget, access-control, and export actions are explicitly deferred.