pass 2 — responses attend to prompt + themselves
k_full construction per response
resp₁
k_prompt
k_resp₁
resp₂
k_prompt
k_resp₂
resp₃
k_prompt
k_resp₃
↓
attention pattern for resp₁ — attends to k_prompt + k_resp₁
attention pattern for resp₁
sees all prompt tokens
sees prior own tokens
blocked
↓
output
resp₁_out
resp₂_out
resp₃_out