rot13 seq-QA task-vector (avg-of-6) — receptor held-out = software
Delta = mean over 6 of ( W(seqqa_rot13) - W(docsonly_rot13) ), sources = people+planets x seeds 1/2/3.
Apply to REAL receptor: W(hugo/v1-7b-software-docsonly-seed1) + lambda*Delta. fp32, Qwen2.5-7B layout. Sweet-spot lambda~1.
