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BFF guidelines
Follow root AGENTS.md. This is an independent Go module; Sendico is an external provider, not a local module dependency. Never add sibling-path replacements, shared database access or internal Sendico discovery/messaging dependencies.
Keep HTTP DTOs/mappers, application models/use cases and provider adapters distinct. Resolve ownership from the authenticated SXCHNGE principal and server-side mappings. Only adapters may expose provider transport types internally. Adapted code belongs to SXCHNGE; record source revision and changes in PROVENANCE.md.
Review the complete backend contribution before delivery. Run make test-backend
and make lint-backend at the repository root. Add behavioral tests for changed
boundaries and failure paths. Errors returned publicly must be stable typed codes;
never expose raw provider errors, secrets, document contents or credentials.