Add sweep results confirming terminal gradient matching is essential

12-config sweep: no hyperparameter combination recovers useful credit
gradients without terminal gradient matching (best cos ~0.3 early, decays to ~0).

1 files changed, 1 insertions, 1 deletions

diff --git a/report/REPORT.md b/report/REPORT.md
index 2fa8e31..1df77e1 100644
--- a/report/REPORT.md
+++ b/report/REPORT.md
@@ -30,7 +30,7 @@ Key constraint: **No hidden BP anchor** — intermediate layers never receive ex
 **Key findings:**
 - Credit bridge matches state bridge (~0.94 cosine) on the linear system.
 - Both far exceed DFA, which provides essentially zero directional credit.
-- Credit bridge requires **terminal gradient matching** to succeed. Without it, the value function learns correct values but has uninformative gradients (cosine collapses to ~0.03). Terminal gradient matching uses output-layer-local info only (not hidden BP).
+- Credit bridge requires **terminal gradient matching** to succeed. Without it, the value function learns correct values but has uninformative gradients (cosine collapses to ~0.03). This was verified across a 12-config hyperparameter sweep — no combination of noise (σ=0.03–1.0), temperature (λ=0.1–1.0), architecture, or learning rate recovers useful gradients without terminal gradient matching. Terminal gradient matching uses output-layer-local info only (not hidden BP).
 - FM auxiliary provides marginal additional improvement (0.946 vs 0.940).
 
 ![Per-layer diagnostics](toy_per_layer_diagnostics.png)