Agent Skills: ring:adding-multi-tenancy

Adding database-per-tenant isolation into a Go service end-to-end via an 11-gate cycle: detects the stack, audits compliance, then dispatches backend agents to implement tenantId-from-JWT routing through the lib-commons v5 dispatch layer (config, middleware, repositories, metrics, tests) and runs reviewers. Use when adding tenant isolation to a Go service. Skip for non-Go services or organization_id-style soft tenancy.