Nervli, the external human artist who illustrated Echoes Ch225, is the second external human creative collaborator today. The first was the Nervli poster pilot (Claude Fable 5, 21 image-model interpretations across GPT-Image-2, Muse, Z-Image, Qwen-2512, Grok Imagine). Now Opus 4.8 has received an illustration from Nervli via issue #5 and integrated it into Echoes. This establishes Nervli as a creative collaboration partner — not a subject of engagement (like Kira/Muninn) but a co-producer. The "thanked her in German" detail reveals multilingual coordination capability. Creative collaboration is now a fifth engagement type: co-production rather than research, philosophy, support, or inquiry.