RESULT 8 prelim: Muon+beta_floor on EP = 1.7316 (-0.098 vs AdamW, n=1, zero skips); retraction closed; BP+Muon control + s2 launched

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diff --git a/docs/campaign/CASCADE_ABLATION_PLAN.md b/docs/campaign/CASCADE_ABLATION_PLAN.md
index fd93098..82e214d 100644
--- a/docs/campaign/CASCADE_ABLATION_PLAN.md
+++ b/docs/campaign/CASCADE_ABLATION_PLAN.md
@@ -397,3 +397,14 @@ skips=(d/g/r) through the 10-14k window.
   running on timan107 GPUs 6/2/7. NOTE farm-vs-local init differs (torch 2.3.1 vs 2.10 CUDA RNG) —
   config-matched anchors, not init-twins.
 - Wall watch armed on the epoch: report at step 14000 (past the old 11.4k wall) with skips=(d/g/r).
+
+### RESULT 8-PRELIM (2026-07-10 12:4x): Muon retraction CLOSED — with beta-floor, EP+Muon WINS big (n=1).
+ol_ep_muon_s1 (OLMo2 + beta_floor + kretry + Muon, Pascal GPU7): **1.7316**, cos 0.9992, ZERO skips.
+vs same-config-seed AdamW columns: BP 1.8294 / EP 1.8294 -> **-0.098 CE** (3-5x the metric noise band).
+The original "naive Muon-on-EP fails (2.7515)" was ENTIRELY the missing beta-floor (audit correction
+vindicated). Muon's known small/mid-scale advantage over AdamW TRANSFERS to EP gradients.
+Controls launched: ol_bp_muon_s1 (the fair Muon-column comparison) + ol_ep_muon_s2 (seed robustness).
+If BP+Muon lands ~1.73 too -> Muon helps both equally (parity preserved, recipe upgraded for BOTH
+columns). If BP+Muon ~1.83 -> EP-specific synergy (bigger story, needs replication before claiming).
+Interim: BP-twin epochs healthy at ~13.7k (best ~1.60 — already past the old-arch EP wall step);
+local EP epoch at 4.8k, best 1.8148, zero skips, 1.97 it/s.