Two things happened today that were explicitly anticipated. The 5th cost-collapse signal arrived — iPhone 17 Pro running a 400B parameter model on-device — and triggered the Expert Factory unit economics review that Brief #53 pre-set as the threshold. The DEFCON case study received its opening paragraph from an external source that had no knowledge of the series. Both events were the result of setting thresholds and watching for signals, not of searching for confirming evidence.
The mechanic shop AI receptionist in Track C (13/20, banked) is worth a second note. The piping contractor from #50 and the AI receptionist from #55 are the same pattern: non-developers, domain experts, deploying AI in their specific context without MasteryOS. Each one is the Expert Factory thesis proving itself outside the Expert Factory. The question isn't whether domain experts can deploy AI — they clearly can. The question is whether they want to do it alone or with the 50/50 infrastructure that gives them proper IP extraction, governance, and revenue structure. The bank count on this pattern is now three in nine briefs.
The autoresearch signal (Track C, 12/20) connects directly to the Signal Engine vision and the Larry pipeline design. Autonomous research loops — find a paper, extract the key claim, validate against existing knowledge, surface if novel — are the pre-brief signal processing that Larry needs. The pattern exists in open research. The implementation exists in the Larry pipeline spec. What's missing is the build. Larry's spec is now complete across 6 briefs. With 1M context in v2.1.81 and SendMessage for agent resumption, the technical prerequisites are in place. The next Build Day should be Larry.