CU-15b: alumno-facing 'ver posición relativa a su camada' — BLOCKED on client anonymization contract (own-position-only vs named-peers). New alumno_postgrado exposure to a KPI surface isStaffRole blocks today; needs self-scoped predicate (effective.id===id) + client ruling on whether alumno sees named peers or only aggregate/own-position. Client flagged 'muy verde, hay que darle forma'. Class-A. Follow-up to CU-15(A) staff camada-compare.