The entirely official origin story
The day an evidence packet fell off the mission queue.
Nobody knows exactly where Astro came from. The accepted account is that an evidence packet once slipped between two digital specialists during a late mission hand-off. Before anyone could open a finding, a small cyan cyber-husky emerged from the console, retrieved the packet and placed it beside the correct provenance record.
He then sat on the approval button until a human arrived, barked at an unsupported conclusion, and refused to roll over until the checksum matched. Innotude mAItrix created the role of Chief Fetch Officer shortly afterwards.
Astro can find a missing hand-off, point at a control gap and celebrate completed evidence. He cannot authorise a mission, invent support or blame the model. That is what makes him a very gud boi.