E1c: k*=0 routing + pre-loop halt target (item 19 scored, E1c pre-registered)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

results-loop/PROTOCOL_UNIFIED.md

@@ -408,3 +408,15 @@ points at a repair).
     deep); (d) overall >= 52.0 at E[k] <= 2.2. If (c) fails while (a,b)
     hold, halting-head recall saturates at probe level and gate quality,
     not gate training, is the binding constraint.
+
+--- Outcome, item 19 / E1b (scored 2026-07-16 ~01:15): prediction (c)
+CONFIRMED (hard 39.3 >= 35.7 at mean k* 2.18), (a) FAILED at r=0.217
+(selectivity real — hard routed 2x deeper than easy (2.18 vs 1.08), the
+program's first nonzero gate correlation — but weak at deploy), (b,d)
+FAILED for a traced design reason: halted_k_per_item lacked k*=0, so easy
+items were forced through >=1 iteration and landed on the merge's WORST
+easy depth (k=1: 85.2%); E0's 97.5% came precisely from k=0 routing.
+E1c amendment (pre-registered before running, same session): pre-loop
+halt consult on s_0 enabling k*=0; targets easy->0, hard->4; threshold
+0.5 unchanged (calibration deferred unless E1c misses). Predictions:
+easy >= 95%, hard >= 35.7%, r >= 0.4, overall >= 51.2 at E[k] <= 1.5.