docs(sp14): Layer A+B close-out — full chain summary pre-Smoke-A2-B

Adds a Layer A+B close-out section to dqn-wire-up-audit.md summarizing
all 15 commits in the SP14 chain (3 Layer A stability fixes + 12 Layer B
EGF pearl tasks).

Includes:
- Commit-by-commit table with SHA + task ID + summary
- Architectural summary post-Layer B (forward + backward + α_grad pipeline)
- 8 explicit kill criteria for Smoke A2-B (per spec B.7)
- B.13 skip rationale (per-kernel oracle tests cover unit behavior;
  B.14 smoke is the real integration test)

Layer B effective end: e41dbb7d8 (B.12). Forward wire, backward gating,
producer chain, and HEALTH_DIAG diagnostics all wired and validated
through cargo check + per-kernel GPU oracle tests + snap stability.

Next: push to origin sp11-reward-as-controlled-subsystem +
submit Smoke A2-B via ./scripts/argo-smoke.sh.

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

docs/dqn-wire-up-audit.md

@@ -6670,3 +6670,45 @@ B.8/B.9 grew `w_b0fc` to `[adv_h, SH2 + 1]` end-to-end across forward dispatch +
 - **Producers**: B.11 active (3 launches every step + 1 per epoch)
 - **EGF gate**: now responsive to live signals (was force-closed at sentinel 0.0)
 
+## SP14 Layer A+B close-out — pre-Smoke-A2-B summary (2026-05-05)
+
+**Commits in chain (15 total):**
+
+| Commit | Task | What |
+|---|---|---|
+| `731cae4c8` | A.2 | set_aux_weight clamp [0.05, 0.3] → [0.15, 1.5] (SP13 P0b range) |
+| `142038321` | A.3 | stagnation warmup gate at fold boundary (Pearl-A first-obs fix) |
+| `f75786fc5` | A.1 | C51 inv_a_std floor lift 1e-6 → 1e-3 (caps amplifier at 1000) |
+| `d63cb7992` | B.1 | sp14_isv_slots.rs (13 new ISV slots at 383-395) |
+| `84de278df` | B.2 | 11 fold-reset registry entries + dispatch arms (atomic) |
+| `d3a35cc6e` | B.3 | q_disagreement_update_kernel (K=4↔K=2 mapping, Hold/Flat masked) |
+| `49cdf90ec` | B.4 | alpha_grad_compute_kernel (EGF heart: Schmitt + adaptive k + adaptive β) |
+| `82fe6cea6` | B.5 | gradient_hack_detect_kernel (anti-mesa-opt circuit breaker) |
+| `4527d8c85` | B.6 | dir_concat_qaux_kernel (pre-SGEMM forward concat) |
+| `9843de5e3` | B.7 | trainer struct fields (4 kernel handles + concat scratch) |
+| `6715ab4ea` | B.8 | w_b0fc input dim SH2 → SH2+1 + fingerprint _AUX1 |
+| `ecf4757c0` | B.9 | forward concat launch + SGEMM K=SH2+1 |
+| `dc3f948ee` | B.10 | backward gradient gating by α_grad_smoothed + closes B.8/B.9 backward K-mismatch |
+| `857722e77` | B.11 | producer chain orchestrator + var_aux Welford gap closure |
+| `e41dbb7d8` | B.12 | per-epoch pearl_egf_diag HEALTH_DIAG emit |
+
+**Layer B skipped commit:** B.13 (5 GPU integration tests). Per-kernel oracle tests landed in B.3-B.6 cover individual unit behavior; the meaningful integration test is B.14's L40S smoke against real data. Snap-size stability verified post-B.12 (149*4=596 bytes unchanged; pearl_egf_diag is a separate log line, not in snap-words).
+
+**Architectural summary post-Layer B:**
+
+1. **Forward wire**: `aux_nb_softmax_buf [B, K=2]` → `dir_concat_qaux_kernel` → `dir_qaux_concat_scratch [B, SH2+1]` → direction Q-head first FC SGEMM with K=SH2+1.
+2. **Backward gating**: dL/dx_concat[B, SH2+1]; column SH2 multiplied by `ISV[ALPHA_GRAD_SMOOTHED_INDEX = 393]` via `sp14_scale_wire_col_kernel`. dL/dW unchanged (Q-head learns to use wire freely).
+3. **α_grad pipeline**: q_disagreement (per step) → alpha_grad_compute (per step) → α_smoothed available before backward → wire-col scale reads it. End-of-epoch gradient_hack_detect runs the circuit breaker.
+
+**Pre-Smoke kill criteria** (per spec B.7):
+- Build/compile failure
+- α_grad_smoothed stuck at 0.0 across 5 epochs in fold 1 when aux_dir_acc reaches 0.55+
+- gate1_open_state never flips to 1 across full smoke
+- aux_dir_acc collapses below 0.40 after gate1 opens AND lockout_remaining stays 0
+- val_sharpe < 0 sustained across 2+ epochs
+- n_up = 0 in HEALTH_DIAG aux_b1_diag (B1.1b regression)
+- Forward stale-input pattern (aux healthy but α_grad oscillates wildly)
+- GRAD_CLIP_OUTLIER count > 100 in fold 2 (Layer A regression check)
+
+**Next**: push to origin → submit Smoke A2-B → monitor with kill criteria above.
+