Multi-Tenant Help Center Retrieval: Privacy Controls That Survive Vendor Migration

<p>The operational constraint is simple: a help-center answer must never cross a tenant boundary, even while the search backend is being replaced. Short answer: use a staged retrieval design with explicit collections, bounded queries, and traceable source context; keep those rules in your application contract so a vendor swap does not rewrite authorization logic.</p> <p>I treat this like an incide

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