fix(B-0421): grok.ts self-documenting failure marker on empty-output cursor-agent exit (acceptance #3)#2949

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fix-b0421-grok-peer-call-wrapper-self-documenting-failure-marker-stderr-capture-2026-05-13Lucent-Financial-Group/Zeta:fix-b0421-grok-peer-call-wrapper-self-documenting-failure-marker-stderr-capture-2026-05-13Copy head branch name to clipboard