RESULT 50: c190封印3.3732(hybrid=1.13x,带0.04主体税); governor尸检三层bug账(用户判定成立); crown-3b(fw72m_plain2)修复栈从头跑已发射; 贴上界servo提案(ρ≈G·β线性平台+ODE步长PI)入册待验证

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014FAPDWQ49M5Ye3NpTndTpn

1 files changed, 22 insertions, 0 deletions

diff --git a/docs/campaign/CASCADE_ABLATION_PLAN.md b/docs/campaign/CASCADE_ABLATION_PLAN.md
index f4471d6..4ee3dbb 100644
--- a/docs/campaign/CASCADE_ABLATION_PLAN.md
+++ b/docs/campaign/CASCADE_ABLATION_PLAN.md
@@ -568,6 +568,28 @@ direction), not training-under-fault; wave-2 = co-training with faults injected
 
 
 
+### RESULT 50 (2026-07-18): c190 SEALED 3.3732 — centered rescues the plain-lineage state
+through the full death window (beta pinned 3e-3, min graze 2.54e-3, zero skips). 2x2 complete:
+the disease is NOT baked into the s190000 weights; single-sided CONTINUED updates collapse the
+ceiling. HYBRID recipe (plain bulk -> centered tail) = 3.3732 at ~1.13x cost; carries the
+~0.04 bulk transmission tax vs full-cent 3.3318 (1.67x). GOVERNOR AUTOPSY (user's verdict,
+correct): crown-3's kill was an adaptive-beta BUG stack — (a) cap hard bottom saturated 18k
+steps above the collapsed ceiling [fixed: cap_floor 0], (b) res/rho illegality gate wired only
+to beta_sync, crown-3 ran bare -> 18k garbage steps ACCEPTED on drift-gate-only [fixed: gate
+always-on when beta_cap_rho>0], (c) probe-validated protections (ride-v2/beta_sync) sat on the
+shelf [scheduling error, R42]. KNEE ARM CANCELLED (user: multi-constant fix rejected);
+replaced by --wsync = synchronous weight-step acceptance in the user's beta_sync idiom
+(snapshot params+momentum pre-step; next relax's SAME _legal gate judges the new state;
+illegal -> (p+snap)/2 halvings -> full revert + skip; zero new constants, model function
+untouched). CROWN-3b IN FLIGHT: fw72m_plain2, from scratch, fixed stack (cap_floor 0 +
+always-on gate + wsync 3), plain est, 234k, DDP GPU1+3. Detonation caveat: wsync SNAPSHOT
+path exercised every step; ROLLBACK path code-reviewed but first live fire will be ~196k.
+OPEN (user thinking + my proposal pending): ceiling-HUGGING beta controller — current
+AIMD-style (slow climb / halve) never sits at the ceiling; proposal = ODE-step-size-style
+servo on the linear plant rho ~= G*beta (G = rho^/beta observable every step, free):
+beta_next = safety*cap_rho / EMA(G) — deadbeat inversion + Gustafsson-PI smoothing,
+rejection gate stays as backstop. To validate in a cheap arm BEFORE any crown use.
+
 ### RESULT 49 (2026-07-18): CYCLE-GAIN DECOMPOSITION — the explosion anatomized (user
 directive). The loop is a ~23-stage product sitting near-critical by construction; plain heats
 ONE stage (b8's sharp head h6, logit 94 vs cent 75) until a MARGINAL crossing; the catastrophe