As high as possible, with no hard ceilings

The target is “as high as possible without losing any functionality, feedback or logs; very efficient, extremely fast; single or many projects; no limits”. 200 is the first checkpoint, then 500, 1000 and beyond, measured by the load harness (the ladder has no stop at a target). Every concurrency limit becomes an adaptive, generous, configurable setting (UR-05), and admission becomes a queue with backpressure instead of a refusal. Refines SCALE-DIR.