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-rw-r--r--docs/campaign/CASCADE_ABLATION_PLAN.md14
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diff --git a/docs/campaign/CASCADE_ABLATION_PLAN.md b/docs/campaign/CASCADE_ABLATION_PLAN.md
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+++ b/docs/campaign/CASCADE_ABLATION_PLAN.md
@@ -568,6 +568,20 @@ direction), not training-under-fault; wave-2 = co-training with faults injected
+### RESULT 67 (2026-07-28): INSTRUMENT RECALIBRATED (1/3 harness confound, 2/3 physics) +
+BATTERY 2 ALL-NEGATIVE — the head-throttle is a SYMPTOM, not the cause; the 0.046 physics leak
+survives every single-component surgery. Localization battery (guaranteed-signal) in flight.
+Battery 2: leak_headmix (head on TRUE BP grads, config-verified) closes 0%; head_lr_mult
+1.67/2.5 closes -1%/-3%. R66's causal chain RETRACTED (the 60% throttle measurement stands,
+but fixing it buys nothing — the head lags because of something upstream, or harmlessly).
+INSTRUMENT CONTROL leak_allbp (EP harness + ALL-BP grads, same data order): 3.5206 vs
+casc_bp_train 3.4982 vs EP arms 3.5668 -> the 0.0685 raw leak = 0.0224 harness/data-order
+artifact (33%) + 0.0462 gradient-physics (67%). Battery 1-2 conclusions survive on the
+recalibrated denominator: five EP configs all at 3.5668 = 0% of 0.0462 closed. Lesson banked:
+cross-harness comparisons REQUIRE the same-harness control arm first (amp-probe lesson, trainer
+edition). Battery-arm discipline: reference configs must pin every factor explicitly.
+BATTERY 3 (localization, must-split by construction): bpmix blocks:6-11 / blocks:0-5 / attn.
+
### RESULT 66 (2026-07-28): THE HEAD IS THROTTLED TO 60% — user's equivalent-LR hypothesis
CONFIRMED and localized to ONE matrix; symmetrization/precision/depth all irrelevant to it.
Displacement micro-probe (600 steps from s250000, ||dW||/||W|| per family): every family