The Architectural Shape Hint: A Spec-Time Trick That Lets 10 AI Agents Run in Parallel Without Stepping on Each Other

I run agent swarms now. Not "an agent" — agents, plural, in flight at once, each working on a different feature against the same repo. Ten agents per session is normal. Twenty isn't unusual when the spec is well-decomposed. The token math works, the wall-clock math works, the model latency hides ins