Phase 46 addendum: threshold sweep - cert-first works only at the label rule's exact parameters; direction closed

EXPERIMENTS.md

@@ -2578,3 +2578,12 @@ cross-origin dynamics, interactions, timer blends, and temporal ensembles
 space, or the declined forward-read. Local champion unchanged (cert-first
 1623.7 / base 1661.7); public champion **3c7b883 at 1661.45**. Deadline
 2026-08-23.
+
+### Phase 46 addendum: the rule is one point wide in BOTH dimensions
+
+Threshold micro-sweep at k=3 (cost harness): 2.40 -> **-37.9** (3W/0L);
+2.41 -> +93.6 (8W/32L); 2.42 -> +383.9; 2.43 -> +314.1. With the earlier
+k-sweep (k=1 +291, k=2 +200), cert-first works ONLY at the label process's
+exact parameters (2.40 V, 3 consecutive gated readings). The mechanism is
+label-rule replay on past data, not prediction; any deviation reverts to
+guessing at sub-break-even precision. Direction closed.