The payoff, and the seed forward
A sensor net lets agents correct themselves and lets you trust code you did not read line by line.
Put it together and you have a sensor net: layered checks, fastest first, each catching a different class of failure, with the critical “must never happen” cases owned by you. That net is what makes the agent era work. It’s what lets an agent correct itself in a tight loop instead of guessing. It’s what lets you accept code you didn’t read line by line — because you trust the net under it more than you’d trust your own line-by-line reading anyway.
Two things seed forward from here. The failure-model habit — deciding what must never happen and encoding it — becomes, at the feature level, the acceptance criteria we write at the seam. And the latency ladder becomes the backbone of how we ship and observe in delivery. Hold both; we harvest them soon.