diff --git a/crates/ml-alpha/src/rl/isv_slots.rs b/crates/ml-alpha/src/rl/isv_slots.rs
index b131fc458..2ddf97970 100644
--- a/crates/ml-alpha/src/rl/isv_slots.rs
+++ b/crates/ml-alpha/src/rl/isv_slots.rs
@@ -1502,42 +1502,44 @@ pub const RL_EVAL_IQN_TAU_MIN_NORMAL_INDEX:            usize = 693;  // 0.10
 pub const RL_EVAL_ENTROPY_COEF_MIN_NORMAL_INDEX:       usize = 694;  // 0.01
 pub const RL_EVAL_PPO_CLIP_EPS_MIN_NORMAL_INDEX:       usize = 695;  // 0.05
 
-// ──────────────────────────────────────────────────────────────────
+// ============================================================
 // Regime observer (spec: 2026-05-31-regime-observer-design.md v3)
 // Unified state-machine signals for risk-stack controllers.
-// ──────────────────────────────────────────────────────────────────
+// ============================================================
 
-// regime_observer outputs (6 surface signals + 4 internal Welford state)
-pub const RL_REGIME_DEAD_ZONE_FLAG_INDEX:           usize = 696;
-pub const RL_REGIME_DEAD_ZONE_DURATION_INDEX:       usize = 697;
-pub const RL_REGIME_DEAD_ZONE_TIMEOUT_FLAG_INDEX:   usize = 698;
-pub const RL_REGIME_RECOVERY_FACTOR_INDEX:          usize = 699;
-pub const RL_REGIME_SESSION_PNL_VARIANCE_EMA_INDEX: usize = 700;
-pub const RL_REGIME_TAIL_EVENT_RECENCY_INDEX:       usize = 701;
-pub const RL_REGIME_SESSION_PNL_VAR_M2_INDEX:       usize = 702;
-pub const RL_REGIME_SESSION_PNL_VAR_MEAN_INDEX:     usize = 703;
-pub const RL_REGIME_SESSION_PNL_VAR_COUNT_INDEX:    usize = 704;
-pub const RL_REGIME_PREV_WORST_PNL_INDEX:           usize = 705;
+// regime_observer outputs (6 surface signals)
+pub const RL_REGIME_DEAD_ZONE_FLAG_INDEX:           usize = 696;  // 0/1
+pub const RL_REGIME_DEAD_ZONE_DURATION_INDEX:       usize = 697;  // counter
+pub const RL_REGIME_DEAD_ZONE_TIMEOUT_FLAG_INDEX:   usize = 698;  // 0/1 (safety net)
+pub const RL_REGIME_RECOVERY_FACTOR_INDEX:          usize = 699;  // [0,1] (drift-free diag)
+pub const RL_REGIME_SESSION_PNL_VARIANCE_EMA_INDEX: usize = 700;  // σ²
+pub const RL_REGIME_TAIL_EVENT_RECENCY_INDEX:       usize = 701;  // counter
+
+// regime_observer internal Welford state (kept on device)
+pub const RL_REGIME_SESSION_PNL_VAR_M2_INDEX:       usize = 702;  // Welford
+pub const RL_REGIME_SESSION_PNL_VAR_MEAN_INDEX:     usize = 703;  // Welford
+pub const RL_REGIME_SESSION_PNL_VAR_COUNT_INDEX:    usize = 704;  // Welford
+pub const RL_REGIME_PREV_WORST_PNL_INDEX:           usize = 705;  // Δ source
 
 // Kelly resurrection (consumed by Kelly kernel in F2)
-pub const RL_KELLY_EPS_RECOVERY_LIVE_INDEX:         usize = 706;
-pub const RL_KELLY_EPS_RECOVERY_MIN_INDEX:          usize = 707;
-pub const RL_KELLY_EPS_RECOVERY_MAX_INDEX:          usize = 708;
-pub const RL_KELLY_EPS_RECOVERY_N_RECOVERY_INDEX:   usize = 709;
+pub const RL_KELLY_EPS_RECOVERY_LIVE_INDEX:         usize = 706;  // current ε value (drift-free)
+pub const RL_KELLY_EPS_RECOVERY_MIN_INDEX:          usize = 707;  // config 0.05
+pub const RL_KELLY_EPS_RECOVERY_MAX_INDEX:          usize = 708;  // config 0.50
+pub const RL_KELLY_EPS_RECOVERY_N_RECOVERY_INDEX:   usize = 709;  // config 100
 
-// Safety net
-pub const RL_REGIME_DEAD_ZONE_MAX_DURATION_INDEX:   usize = 710;
+// Safety net: dead-zone timeout (issue #4 — bounded loss during prolonged adverse regime)
+pub const RL_REGIME_DEAD_ZONE_MAX_DURATION_INDEX:   usize = 710;  // config 1000 steps
 
 // IQN τ tail-boost (consumed in F5)
-pub const RL_IQN_TAU_TAIL_BOOST_FACTOR_INDEX:       usize = 711;
-pub const RL_IQN_TAU_TAIL_BOOST_N_WINDOW_INDEX:     usize = 712;
+pub const RL_IQN_TAU_TAIL_BOOST_FACTOR_INDEX:       usize = 711;  // config 1.5
+pub const RL_IQN_TAU_TAIL_BOOST_N_WINDOW_INDEX:     usize = 712;  // config 100
 
 // regime_observer config
-pub const RL_REGIME_TAIL_SIGMA_THRESHOLD_INDEX:     usize = 713;
+pub const RL_REGIME_TAIL_SIGMA_THRESHOLD_INDEX:     usize = 713;  // config 3.0
 
 // Popart per-account max envelope (consumed by popart in F4)
-pub const RL_POPART_MAX_ABS_REWARD_EMA_INDEX:       usize = 714;
-pub const RL_POPART_MAX_DECAY_ALPHA_INDEX:          usize = 715;
+pub const RL_POPART_MAX_ABS_REWARD_EMA_INDEX:       usize = 714;  // envelope-detector state
+pub const RL_POPART_MAX_DECAY_ALPHA_INDEX:          usize = 715;  // config 0.01
 
 /// Last RL-allocated slot index (exclusive).
 /// Pre-risk-stack: 662. Post-Fix-B: 685. Post-v9 (warmup boundary): 696.