Remove platform tenancy from SXCHNGE customer BFF (#34)

backend/AGENTS.md

@@ -86,7 +86,11 @@ skill to perform this completion workflow.
 ## SXCHNGE provider boundary
 
 SXCHNGE owns auth, sessions and customer management. SXCHNGE is one organization
-inside Sendico. Copied BFF components are locally owned and may diverge.
+inside Sendico. This organization reference belongs only in the public provider
+adapter configuration. Local customers have no organizations, tenant IDs,
+membership, roles or policy engine. Do not copy platform scaffolding to satisfy
+unused dependencies; remove those dependencies from the selected components.
+Copied BFF components are locally owned and may diverge.
 Use only Sendico's public HTTP API for platform operations. Never import sibling
 Sendico modules or access its database, internal gRPC APIs, discovery or message
 bus. Keep the pinned public wire contract separate from local DTOs and models.