plan(sp18 v2): allocate 22 ISV slots [483..505) for D-leg + B-leg

Adds combined SP18 D-leg Hold-reward adaptive-cap slots [483..493) +
B-leg TD(λ) Q(s') bootstrap diagnostics + PopArt reset flag at
[493..505) per spec DD6 (D-leg 10 slots) + B-DD13 (B-leg 12 slots).

D-leg [483..493) — 10 slots:
  483 HOLD_REWARD_POS_CAP            (sentinel 5.0,  bounds [0.5, 50])
  484 HOLD_REWARD_NEG_CAP            (sentinel -10.0)
  485 HOLD_REWARD_DECOMP_DIAG        (sentinel 0.0)
  486 HOLD_OPP_COST_FIRE_RATE_EMA    (sentinel 0.0)
  487..493 HRC_* Welford accumulators (mirrors SP16 T3 HCS_* pattern)

B-leg [493..505) — 12 slots:
  493 TD_ERROR_MAG_EMA               (HEALTH_DIAG B-DD9 ratio gate input)
  494 Q_NEXT_TARGET_P99              (target-Q bootstrap bound check)
  495 Q_NEXT_MINUS_REWARD_P99        (sanity: should be O(1) post-fix)
  496 V_SHARE_TREND_DIAG             (B-leg synergy probe)
  497 POPART_RESET_FLAG              (sentinel 1.0 — one-shot, B-DD11)
  498..504 TDB_* Welford accumulators (mirrors HRC_* pattern)
  504 RESERVED                        (B-leg follow-up)

Pearl-A first-observation bootstrap sentinels match position-side
SP14 P0-A REWARD_POS_CAP_ADAPTIVE pattern (POS=5.0, NEG=-10.0). Slot
497 POPART_RESET_FLAG sentinel = 1.0 per B-DD11 — host writes 1.0
once at first SP18 epoch, kernel zeroes after consuming, gating the
per-fold PopArt slot 63 EMA reset at the SP18 deployment boundary.

ISV_TOTAL_DIM bumped 483 → 505; layout_fingerprint_seed updated with
all 22 new slot names; state_layout.cuh C-side mirror in lockstep
(continues SP14-P0A/P1/audit-fix-4A/4B mirror precedent — SP16/SP17
slots intentionally not mirrored per existing pattern, only SP18 gets
fresh mirror entries).

`feedback_no_partial_refactor`: both legs share an ISV section + a
single fingerprint bump; SP13 [380..383) and SP16 [461..474) slots
remain ALLOCATED but RETIRED in PP.4 (sentinel 0.0, no producer
launch — RESERVED-gap pattern from SP14-C.1 preserves checkpoint
compatibility).

Audit doc updated per Invariant 7 with Pre-Phase PP.2 entry.

Spec: docs/superpowers/specs/2026-05-08-sp18-reward-shape-hold-attractor-design.md
Plan: docs/superpowers/plans/2026-05-08-sp18-reward-shape-hold-attractor.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/ml/src/cuda_pipeline/sp14_isv_slots.rs

@@ -680,6 +680,157 @@ pub const ADVANTAGE_CLIP_EMA_ALPHA:     f32 = 0.01;
 pub const SP17_DUELING_SLOT_BASE: usize = 474;
 pub const SP17_DUELING_SLOT_END:  usize = 483;
 
+// ── SP18 (2026-05-08) — combined Hold-attractor fix: D-leg + B-leg ─────
+// 22 ISV slots [483..505) split across two legs per the v2 combined plan:
+//
+//   D-leg [483..493) — 10 slots (DD6).
+//   B-leg [493..505) — 12 slots (B-DD13, including 1 RESERVED).
+//
+// D-leg ("structural Hold opportunity-cost reward")
+// ──────────────────────────────────────────────────
+// Replaces the SP13 P0a + SP16 P2 + SP16 T3 reactive per-bar Hold-cost
+// chain (per DD7=c) with a structural reward at the 3 Hold-cost
+// subtraction sites in `experience_kernels.cu`. Each Hold-action bar pays
+// `compute_sp18_hold_opportunity_cost(-2 × vol_normalized_next_log_return,
+// neg_cap, pos_cap, shaping_scale)` — a counterfactual cost in the
+// realised next-bar log-return units, asymmetric-capped via the new
+// adaptive producer kernel `hold_reward_cap_update_kernel.cu`.
+//
+//   [483]  HOLD_REWARD_POS_CAP        upper bound on positive Hold reward
+//                                     (Hold during a losing bar)
+//   [484]  HOLD_REWARD_NEG_CAP        lower bound on negative Hold reward
+//                                     (Hold during a winning bar — opp cost)
+//   [485]  HOLD_REWARD_DECOMP_DIAG    HEALTH_DIAG: per-action-bin reward
+//                                     decomposition diagnostic (Phase 0)
+//   [486]  HOLD_OPP_COST_FIRE_RATE_EMA fraction of bars with non-zero
+//                                     Hold opp-cost reward (engagement
+//                                     canary — should be ≈ Hold% itself)
+//   [487..493) HRC_*                  Welford accumulators for Wiener-α
+//                                     EMA blend (mirrors SP16 T3 HCS_*
+//                                     layout — 6 slots)
+//
+// Cap producer (Phase 3): reads `p99(|step_ret|)` over Long/Short trade
+// closes (DD3=b), multiplies by HOLD_REWARD_CAP_SAFETY_FACTOR=1.5, writes
+// POS=that and NEG=−2 × POS (DD5=b mirrored asymmetry — same 2:1
+// loss-aversion ratio as SP14 P0-A REWARD_POS/NEG_CAP). Wiener-optimal α
+// from the Welford accumulators in [487..493) per
+// `pearl_wiener_optimal_adaptive_alpha`.
+//
+// Pearl-A first-observation bootstrap sentinels POS=5.0 / NEG=−10.0
+// match the position-side SP14 P0-A REWARD_POS/NEG_CAP_ADAPTIVE pattern
+// for bit-identical cold-start before the first valid producer launch
+// lands a real cap. Bounds [POS_MIN=0.5, POS_MAX=50.0] are Category-1
+// dimensional safety floors per `feedback_isv_for_adaptive_bounds.md`.
+//
+// SP13 [380..383)/SP16 [461..474) slots remain ALLOCATED but RETIRED per
+// PP.4 — sentinel 0.0, no producer launch. Slots stay in the layout
+// fingerprint to preserve checkpoint compatibility (RESERVED-gap pattern
+// established at SP14-C.1).
+//
+// Plan: docs/superpowers/plans/2026-05-08-sp18-reward-shape-hold-attractor.md
+pub const HOLD_REWARD_POS_CAP_INDEX:           usize = 483;
+pub const HOLD_REWARD_NEG_CAP_INDEX:           usize = 484;
+pub const HOLD_REWARD_DECOMP_DIAG_INDEX:       usize = 485;
+pub const HOLD_OPP_COST_FIRE_RATE_EMA_INDEX:   usize = 486;
+pub const HRC_TARGET_MEAN_INDEX:               usize = 487;  // Welford running mean of target_cap
+pub const HRC_TARGET_M2_INDEX:                 usize = 488;  // Welford ΣΔ² (sample variance)
+pub const HRC_DIFF_MEAN_INDEX:                 usize = 489;  // Welford running mean of consecutive diffs
+pub const HRC_DIFF_M2_INDEX:                   usize = 490;  // Welford ΣΔ² for diff series
+pub const HRC_PREV_TARGET_INDEX:               usize = 491;  // previous-epoch target_cap (for diff)
+pub const HRC_SAMPLE_COUNT_INDEX:              usize = 492;  // Welford counter
+
+// Sentinels — Pearl-A first-observation bootstrap. POS=5.0 / NEG=-10.0
+// match the SP14 P0-A REWARD_POS/NEG_CAP_ADAPTIVE pattern (bit-identical
+// cold-start to the position-side adaptive cap). DIAG / FIRE_RATE bootstrap
+// to 0.0 — Pearl-A direct-replace on first valid observation.
+pub const SENTINEL_HOLD_REWARD_POS_CAP:        f32 =   5.0;
+pub const SENTINEL_HOLD_REWARD_NEG_CAP:        f32 = -10.0;
+pub const SENTINEL_HOLD_REWARD_DIAG:           f32 =   0.0;
+pub const SENTINEL_HOLD_OPP_FIRE_RATE:         f32 =   0.0;
+
+// Category-1 dimensional safety bounds per `feedback_isv_for_adaptive_bounds`.
+// Floor 0.5: below this any positive Hold reward is essentially noise; the
+// asymmetric ratio NEG=-2×POS would drop NEG below -1, smaller than typical
+// per-bar reward magnitudes. Ceiling 50.0: above this a single adversarial
+// outlier from the Long/Short close p99 can dominate the EMA. Mirrors the
+// SP14 P0-A REWARD_POS_CAP_MIN/MAX pattern.
+pub const HOLD_REWARD_POS_CAP_MIN_BOUND:       f32 =  0.5;
+pub const HOLD_REWARD_POS_CAP_MAX_BOUND:       f32 = 50.0;
+
+// Producer constants. Safety factor 1.5× p99 mirrors the SP14 P0-A
+// REWARD_POS_CAP producer pattern. EMA α is Wiener-optimal per
+// `pearl_wiener_optimal_adaptive_alpha` (Welford accumulators in
+// [487..493)) — no hardcoded constant.
+pub const HOLD_REWARD_CAP_SAFETY_FACTOR:       f32 = 1.5;
+
+pub const SP18_HOLD_REWARD_SLOT_BASE: usize = 483;
+pub const SP18_HOLD_REWARD_SLOT_END:  usize = 493;
+
+// B-leg ("TD(λ) Q(s') bootstrap")
+// ──────────────────────────────────
+// Replaces the `q_next = rewards` self-bootstrap at
+// `gpu_experience_collector.rs:4143` with a real per-branch DDQN
+// `Q_target(s', argmax_a Q_online(s', a))` computed by a target-net
+// forward pass on `next_states` at experience-collection time. Reuses
+// existing `target_params_buf` (SP14 P4.T1B-iv Polyak-tracked) — no new
+// target-net infra (B-DD1).
+//
+//   [493]  TD_ERROR_MAG_EMA          HEALTH_DIAG: avg(|TD-error|) post-fix
+//                                    (B-DD9 ratio gate input)
+//   [494]  Q_NEXT_TARGET_P99         p99 of target-Q bootstrap (bound
+//                                    sanity check on the new path)
+//   [495]  Q_NEXT_MINUS_REWARD_P99   p99 of |q_next_target − rewards|
+//                                    (sanity: should be O(1) post-fix —
+//                                    proves the fix is doing something
+//                                    AND not blowing up)
+//   [496]  V_SHARE_TREND_DIAG        slope of V_SHARE EMA across last 4
+//                                    epochs (B-leg synergy probe — the
+//                                    bootstrap-bias hypothesis predicts
+//                                    v_share monotone HD0→HD4)
+//   [497]  POPART_RESET_FLAG         1.0 first epoch post-deployment;
+//                                    0.0 thereafter (B-DD11 — gates the
+//                                    per-fold PopArt slot 63 EMA reset
+//                                    at the SP18 deployment boundary).
+//                                    NOT a FoldReset — host writes 1.0
+//                                    once at deploy, kernel zeroes it
+//                                    after consuming.
+//   [498..504) TDB_*                 Welford accumulators for Wiener-α
+//                                    EMA blend on q_next_target stats
+//                                    (mirrors HRC_* layout — 6 slots)
+//   [504]  RESERVED                  reserved for B-leg follow-up
+//
+// Pearl-A first-observation bootstrap sentinels match the canonical
+// pattern: TD/Q/V_SHARE_TREND diagnostic slots → 0.0; POPART_RESET_FLAG
+// → 1.0 (one-shot signalling first SP18-deployment epoch).
+//
+// Spec §B-DD12 (HEALTH_DIAG observability) + §B-DD13 (slot allocation)
+// + §B-DD11 (PopArt reset gate).
+pub const TD_ERROR_MAG_EMA_INDEX:              usize = 493;
+pub const Q_NEXT_TARGET_P99_INDEX:             usize = 494;
+pub const Q_NEXT_MINUS_REWARD_P99_INDEX:       usize = 495;
+pub const V_SHARE_TREND_DIAG_INDEX:            usize = 496;
+pub const POPART_RESET_FLAG_INDEX:             usize = 497;
+pub const TDB_TARGET_MEAN_INDEX:               usize = 498;
+pub const TDB_TARGET_M2_INDEX:                 usize = 499;
+pub const TDB_DIFF_MEAN_INDEX:                 usize = 500;
+pub const TDB_DIFF_M2_INDEX:                   usize = 501;
+pub const TDB_PREV_TARGET_INDEX:               usize = 502;
+pub const TDB_SAMPLE_COUNT_INDEX:              usize = 503;
+pub const SP18_B_LEG_RESERVED_INDEX:           usize = 504;
+
+// Sentinels — Pearl-A first-observation bootstrap. Diagnostic slots
+// (493, 494, 495, 496) bootstrap to 0.0 — Pearl-A direct-replace on
+// first valid observation. POPART_RESET_FLAG=1.0 (one-shot — gates the
+// per-fold PopArt slot 63 EMA reset on the first SP18 epoch per B-DD11).
+pub const SENTINEL_TD_ERROR_MAG_EMA:           f32 = 0.0;
+pub const SENTINEL_Q_NEXT_TARGET_P99:          f32 = 0.0;
+pub const SENTINEL_Q_NEXT_MINUS_REWARD_P99:    f32 = 0.0;
+pub const SENTINEL_V_SHARE_TREND_DIAG:         f32 = 0.0;
+pub const SENTINEL_POPART_RESET_FLAG:          f32 = 1.0;  // one-shot ⇒ PopArt reset at first SP18 epoch
+
+pub const SP18_TD_BOOTSTRAP_SLOT_BASE: usize = 493;
+pub const SP18_TD_BOOTSTRAP_SLOT_END:  usize = 505;
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -1057,4 +1208,76 @@ mod tests {
             SP17_DUELING_SLOT_END, ISV_TOTAL_DIM,
         );
     }
+
+    /// Lock SP18 (2026-05-08 v2 combined) D-leg + B-leg slot layout.
+    /// 22 contiguous slots [483..505): 10 D-leg + 12 B-leg. Per
+    /// `feedback_no_partial_refactor`, both legs share an ISV section
+    /// and a single layout fingerprint bump — combined SP18 lands all 22
+    /// slots atomically in Pre-Phase before Phase 0+ wiring.
+    #[test]
+    fn sp18_combined_slot_layout_locked() {
+        // ── D-leg [483..493) ─────────────────────────────────────────
+        assert_eq!(SP18_HOLD_REWARD_SLOT_BASE,             483);
+        assert_eq!(SP18_HOLD_REWARD_SLOT_END,              493);
+        assert_eq!(HOLD_REWARD_POS_CAP_INDEX,              483);
+        assert_eq!(HOLD_REWARD_NEG_CAP_INDEX,              484);
+        assert_eq!(HOLD_REWARD_DECOMP_DIAG_INDEX,          485);
+        assert_eq!(HOLD_OPP_COST_FIRE_RATE_EMA_INDEX,      486);
+        assert_eq!(HRC_TARGET_MEAN_INDEX,                  487);
+        assert_eq!(HRC_TARGET_M2_INDEX,                    488);
+        assert_eq!(HRC_DIFF_MEAN_INDEX,                    489);
+        assert_eq!(HRC_DIFF_M2_INDEX,                      490);
+        assert_eq!(HRC_PREV_TARGET_INDEX,                  491);
+        assert_eq!(HRC_SAMPLE_COUNT_INDEX,                 492);
+
+        // ── B-leg [493..505) ─────────────────────────────────────────
+        assert_eq!(SP18_TD_BOOTSTRAP_SLOT_BASE,            493);
+        assert_eq!(SP18_TD_BOOTSTRAP_SLOT_END,             505);
+        assert_eq!(TD_ERROR_MAG_EMA_INDEX,                 493);
+        assert_eq!(Q_NEXT_TARGET_P99_INDEX,                494);
+        assert_eq!(Q_NEXT_MINUS_REWARD_P99_INDEX,          495);
+        assert_eq!(V_SHARE_TREND_DIAG_INDEX,               496);
+        assert_eq!(POPART_RESET_FLAG_INDEX,                497);
+        assert_eq!(TDB_TARGET_MEAN_INDEX,                  498);
+        assert_eq!(TDB_TARGET_M2_INDEX,                    499);
+        assert_eq!(TDB_DIFF_MEAN_INDEX,                    500);
+        assert_eq!(TDB_DIFF_M2_INDEX,                      501);
+        assert_eq!(TDB_PREV_TARGET_INDEX,                  502);
+        assert_eq!(TDB_SAMPLE_COUNT_INDEX,                 503);
+        assert_eq!(SP18_B_LEG_RESERVED_INDEX,              504);
+
+        // ── Sentinels — Pearl-A first-observation bootstrap (D-leg) ──
+        assert_eq!(SENTINEL_HOLD_REWARD_POS_CAP,           5.0);
+        assert_eq!(SENTINEL_HOLD_REWARD_NEG_CAP,         -10.0);
+        assert_eq!(SENTINEL_HOLD_REWARD_DIAG,              0.0);
+        assert_eq!(SENTINEL_HOLD_OPP_FIRE_RATE,            0.0);
+
+        // ── Sentinels — B-leg ─────────────────────────────────────────
+        assert_eq!(SENTINEL_TD_ERROR_MAG_EMA,              0.0);
+        assert_eq!(SENTINEL_Q_NEXT_TARGET_P99,             0.0);
+        assert_eq!(SENTINEL_Q_NEXT_MINUS_REWARD_P99,       0.0);
+        assert_eq!(SENTINEL_V_SHARE_TREND_DIAG,            0.0);
+        assert_eq!(SENTINEL_POPART_RESET_FLAG,             1.0); // 1.0 first epoch ⇒ PopArt reset (B-DD11)
+
+        // ── Bounds (D-leg, Category-1 floors) ────────────────────────
+        assert_eq!(HOLD_REWARD_POS_CAP_MIN_BOUND,          0.5);
+        assert_eq!(HOLD_REWARD_POS_CAP_MAX_BOUND,         50.0);
+
+        // ── Producer constants ───────────────────────────────────────
+        assert_eq!(HOLD_REWARD_CAP_SAFETY_FACTOR,          1.5);
+    }
+
+    /// Asserts SP18 combined slot range fits within ISV_TOTAL_DIM.
+    /// Mirrors the SP17 / SP14 / SP5 pattern. The contract test fails
+    /// with a clear actionable message before any consumer can drift.
+    #[test]
+    fn all_sp18_slots_fit_within_isv_total_dim() {
+        use crate::cuda_pipeline::gpu_dqn_trainer::ISV_TOTAL_DIM;
+        assert!(
+            SP18_TD_BOOTSTRAP_SLOT_END <= ISV_TOTAL_DIM,
+            "SP18_TD_BOOTSTRAP_SLOT_END={} exceeds ISV_TOTAL_DIM={}; \
+             bump ISV_TOTAL_DIM in gpu_dqn_trainer.rs (and update layout_fingerprint_seed()).",
+            SP18_TD_BOOTSTRAP_SLOT_END, ISV_TOTAL_DIM,
+        );
+    }
 }

crates/ml/src/cuda_pipeline/state_layout.cuh

@@ -469,6 +469,92 @@
 // See the SP16 T3 SLOTS section above for the slot indices.
 #define DIR_ACC_RANDOM_BASELINE            0.5f
 
+// ── SP18 (2026-05-08) — combined Hold-attractor fix: D-leg + B-leg ────
+// 22 ISV slots [483..505) split across two atomic legs per the v2
+// combined plan. Mirrors `crates/ml/src/cuda_pipeline/sp14_isv_slots.rs`
+// constants of the same names (locked by `sp18_combined_slot_layout_locked`
+// test). Like SP16/SP17 mirrors, the C-side header tracks slot indices
+// + sentinels + bounds for kernels that read the bus directly via raw
+// indices; the Rust constant is the single source of truth (see
+// ISV_TOTAL_DIM macro note above).
+//
+// D-leg ("structural Hold opportunity-cost reward") replaces the SP13
+// P0a + SP16 P2 + SP16 T3 reactive per-bar Hold-cost chain (DD7=c) with
+// a structural reward at the 3 Hold-cost subtraction sites in
+// experience_kernels.cu via the new device function
+// `compute_sp18_hold_opportunity_cost` (added to trade_physics.cuh in
+// Phase 2). HOLD_REWARD_POS_CAP / HOLD_REWARD_NEG_CAP are adaptive bounds
+// producer-tracked from p99(|step_ret|) over Long/Short trade closes ×
+// HOLD_REWARD_CAP_SAFETY_FACTOR=1.5 (DD3=b) with NEG = -2 × POS
+// (DD5=b mirrored loss-aversion).
+//
+// B-leg ("TD(λ) Q(s') bootstrap") replaces the q_next = rewards
+// self-bootstrap at gpu_experience_collector.rs:4143 with a real
+// per-branch DDQN `Q_target(s', argmax_a Q_online(s', a))` computed via
+// target-net forward pass on next_states at experience-collection time
+// (Phase 4-5). All B-leg slots are observability-only (HEALTH_DIAG
+// diagnostics) plus the one-shot POPART_RESET_FLAG that gates the
+// per-fold PopArt EMA reset at the SP18 deployment boundary (B-DD11).
+//
+// Plan: docs/superpowers/plans/2026-05-08-sp18-reward-shape-hold-attractor.md
+
+// D-leg slots [483..493) — 10 slots
+#define HOLD_REWARD_POS_CAP_INDEX             483
+#define HOLD_REWARD_NEG_CAP_INDEX             484
+#define HOLD_REWARD_DECOMP_DIAG_INDEX         485
+#define HOLD_OPP_COST_FIRE_RATE_EMA_INDEX     486
+#define HRC_TARGET_MEAN_INDEX                 487
+#define HRC_TARGET_M2_INDEX                   488
+#define HRC_DIFF_MEAN_INDEX                   489
+#define HRC_DIFF_M2_INDEX                     490
+#define HRC_PREV_TARGET_INDEX                 491
+#define HRC_SAMPLE_COUNT_INDEX                492
+
+// D-leg sentinels — Pearl-A first-observation bootstrap. POS=5.0 /
+// NEG=-10.0 match the SP14 P0-A REWARD_POS/NEG_CAP_ADAPTIVE pattern
+// (bit-identical cold-start to the position-side adaptive cap).
+#define SENTINEL_HOLD_REWARD_POS_CAP            5.0f
+#define SENTINEL_HOLD_REWARD_NEG_CAP          -10.0f
+#define SENTINEL_HOLD_REWARD_DIAG               0.0f
+#define SENTINEL_HOLD_OPP_FIRE_RATE             0.0f
+
+// D-leg defensive consumer-side bounds (mirror Rust constants
+// HOLD_REWARD_POS_CAP_MIN/MAX_BOUND in sp14_isv_slots.rs). Values
+// outside this window fall back to sentinels on the consumer side as a
+// defense against malformed prior state. Producer kernel clamps to the
+// same range, so a healthy ISV slot will always pass the guard.
+#define HOLD_REWARD_POS_CAP_MIN_BOUND           0.5f
+#define HOLD_REWARD_POS_CAP_MAX_BOUND          50.0f
+
+// D-leg producer constant. Safety factor 1.5× p99 mirrors the SP14 P0-A
+// REWARD_POS_CAP producer pattern.
+#define HOLD_REWARD_CAP_SAFETY_FACTOR           1.5f
+
+// B-leg slots [493..505) — 12 slots
+#define TD_ERROR_MAG_EMA_INDEX                493
+#define Q_NEXT_TARGET_P99_INDEX               494
+#define Q_NEXT_MINUS_REWARD_P99_INDEX         495
+#define V_SHARE_TREND_DIAG_INDEX              496
+#define POPART_RESET_FLAG_INDEX               497
+#define TDB_TARGET_MEAN_INDEX                 498
+#define TDB_TARGET_M2_INDEX                   499
+#define TDB_DIFF_MEAN_INDEX                   500
+#define TDB_DIFF_M2_INDEX                     501
+#define TDB_PREV_TARGET_INDEX                 502
+#define TDB_SAMPLE_COUNT_INDEX                503
+#define SP18_B_LEG_RESERVED_INDEX             504
+
+// B-leg sentinels — Pearl-A first-observation bootstrap. Diagnostic
+// slots bootstrap to 0.0 (direct-replace on first valid observation).
+// POPART_RESET_FLAG sentinel = 1.0 (one-shot — gates the per-fold
+// PopArt slot 63 EMA reset on the first SP18 epoch per B-DD11; host
+// writes 1.0 at deploy, kernel zeroes after consuming).
+#define SENTINEL_TD_ERROR_MAG_EMA              0.0f
+#define SENTINEL_Q_NEXT_TARGET_P99             0.0f
+#define SENTINEL_Q_NEXT_MINUS_REWARD_P99       0.0f
+#define SENTINEL_V_SHARE_TREND_DIAG            0.0f
+#define SENTINEL_POPART_RESET_FLAG             1.0f
+
 // ── Compile-time checks ──
 static_assert(SL_PADDING_START + SL_PADDING_DIM == SL_STATE_DIM,
     "State layout dimensions must sum to SL_STATE_DIM");

docs/dqn-wire-up-audit.md

@@ -2,6 +2,46 @@
 
 **Status:** Populated during Plan 1 Task 6 (A.5 orphan audit). Updated on every commit per Invariant 7.
 
+## 2026-05-08 — SP18 v2 Pre-Phase Task PP.2: 22 ISV slots [483..505) D-leg + B-leg
+
+Pre-Phase scaffolding for the combined SP18 v2 plan: allocates 22 ISV slots split across two atomic legs per `feedback_no_partial_refactor`.
+
+**D-leg [483..493) — 10 slots** ("structural Hold opportunity-cost reward"):
+
+| Slot | Name | Sentinel | Notes |
+|---|---|---|---|
+| 483 | `HOLD_REWARD_POS_CAP` | 5.0 | Pearl-A; matches SP14 P0-A REWARD_POS_CAP for bit-identical cold-start |
+| 484 | `HOLD_REWARD_NEG_CAP` | -10.0 | Pearl-A; -2× POS preserves Kahneman 2:1 loss-aversion ratio |
+| 485 | `HOLD_REWARD_DECOMP_DIAG` | 0.0 | HEALTH_DIAG observability — Phase 0 reward decomposition |
+| 486 | `HOLD_OPP_COST_FIRE_RATE_EMA` | 0.0 | Engagement canary — should be ≈ Hold% itself |
+| 487..493 | 6 `HRC_*` Welford accumulators | 0.0 | Mirrors SP16 T3 `HCS_*` Wiener-α layout |
+
+**B-leg [493..505) — 12 slots** ("TD(λ) Q(s') bootstrap"):
+
+| Slot | Name | Sentinel | Notes |
+|---|---|---|---|
+| 493 | `TD_ERROR_MAG_EMA` | 0.0 | HEALTH_DIAG observability — B-DD9 ratio-gate input (`avg(\|TD-error\|)`) |
+| 494 | `Q_NEXT_TARGET_P99` | 0.0 | bound check on the new target-Q bootstrap |
+| 495 | `Q_NEXT_MINUS_REWARD_P99` | 0.0 | sanity: should be O(1) post-fix (proves the fix is doing something AND not blowing up) |
+| 496 | `V_SHARE_TREND_DIAG` | 0.0 | B-leg synergy probe (slope of V_SHARE EMA across last 4 epochs) |
+| 497 | `POPART_RESET_FLAG` | **1.0** | one-shot, NOT a FoldReset; gates per-fold PopArt slot 63 EMA reset at SP18 deployment boundary per B-DD11 |
+| 498..504 | 6 `TDB_*` Welford accumulators | 0.0 | Mirrors `HRC_*` Wiener-α layout |
+| 504 | `RESERVED` | 0.0 | reserved for B-leg follow-up |
+
+**Pearl pattern**: D-leg POS/NEG cap sentinels match the position-side SP14 P0-A `REWARD_POS_CAP_ADAPTIVE` pattern (5.0 / -10.0) for bit-identical cold-start before the cap producer (Phase 3) lands a real `p99(|step_ret|) × 1.5`. The B-leg POPART_RESET_FLAG=1.0 is the only non-zero sentinel — host writes 1.0 once at the SP18 deployment boundary, kernel zeroes after consuming (one-shot signalling, NOT a FoldReset).
+
+**Bounds**: D-leg POS cap clamped to `[0.5, 50.0]` Category-1 dimensional safety floors per `feedback_isv_for_adaptive_bounds`. B-leg slots are observability-only (no bounds enforced — diagnostic readout only).
+
+**ISV_TOTAL_DIM**: 483 → 505. `layout_fingerprint_seed` extended with 22 new `SLOT_*` entries. `state_layout.cuh` mirror added (continues SP14 P0-A/P1/audit-fix-4A/4B precedent — SP16/SP17 slots intentionally not mirrored, only SP18 gets fresh `#define`s for the device-side header).
+
+**Atomicity envelope**: Pre-Phase scaffolding only — 22 ISV slots locked, fingerprint extended, mirror constants in C header. NO producer kernel, NO consumer wire-in, NO HEALTH_DIAG emit. Phase 0 (diagnostic emit), Phases 1–7 (consumer/producer), Phases 8–10 (validation) follow per the v2 plan.
+
+**SP13/SP16 retirement**: Slots [380..383) (HOLD_COST + HOLD_RATE_TARGET + HOLD_RATE_OBSERVED_EMA) and [461..474) (HOLD_COST_SCALE + Welford accumulators) remain ALLOCATED but will be RETIRED in PP.4 (sentinel 0.0, no producer launch) per the SP14-C.1 RESERVED-gap pattern — preserves checkpoint compatibility while DD7=c replaces the reactive per-bar Hold-cost chain with the structural opportunity-cost reward.
+
+**Plan**: `docs/superpowers/plans/2026-05-08-sp18-reward-shape-hold-attractor.md` § Pre-Phase Task PP.2.
+
+**Spec**: `docs/superpowers/specs/2026-05-08-sp18-reward-shape-hold-attractor-design.md` § DD6 + B-DD13.
+
 ## 2026-05-08 — SP17 Phase 3.3: Phase 3 close-out + memory pearl
 
 Phase 3.3 finalises the SP17 dueling-Q diagnostic chain: