Add d=512 ResMLP audit table (3 seeds): cross-width validation

Same protocol applied to the 4-block d=512 ResMLP variant (vs the d=256
default). 4 methods × 3 seeds = 12 conditions:

  BP @ d=512:           trustworthy on all 3 seeds (acc 0.60-0.61)
  DFA @ d=512:          walked back on all 3 seeds via (a)+(b)
  State Bridge @ d=512: walked back on all 3 seeds via (a)+(b), with
                         drift sub-mode on s123 (stability 0.879)
  Credit Bridge @ d=512: walked back on all 3 seeds via (a)+(b)

Width effect: max-per-block growth is HIGHER at d=512 (6e3-7e4) than at
d=256 (~1e3). Larger width amplifies the explosion. The protocol
verdicts are robust to this — same binary outcome, more extreme
quantitative numbers.

This is the cross-width validation: the protocol's findings are not
d=256-specific. The §3 audit results generalize across the width
dimension.

1 files changed, 122 insertions, 0 deletions

diff --git a/results/protocol_audit/audit_d512_3seed.json b/results/protocol_audit/audit_d512_3seed.json
new file mode 100644
index 0000000..4b5f6fb
--- /dev/null
+++ b/results/protocol_audit/audit_d512_3seed.json
@@ -0,0 +1,122 @@
+[
+  {
+    "method": "bp",
+    "seed": 42,
+    "acc": 0.6019,
+    "h_L": 389.4543151855469,
+    "g_L": 0.000248963973717764,
+    "stability": 0.20287561358677017,
+    "max_per_block": 1.00832723741786,
+    "verdict": "trustworthy"
+  },
+  {
+    "method": "dfa",
+    "seed": 42,
+    "acc": 0.3155,
+    "h_L": 2242272512.0,
+    "g_L": 6.923160378313753e-10,
+    "stability": 0.12479152232408523,
+    "max_per_block": 7788.42805432434,
+    "verdict": "needs walk-back: residual stream exploded; BP grad at numerical floor"
+  },
+  {
+    "method": "state_bridge",
+    "seed": 42,
+    "acc": 0.19,
+    "h_L": 158286368.0,
+    "g_L": 1.5313229573266085e-09,
+    "stability": 0.17412672605779436,
+    "max_per_block": 25812.527378026225,
+    "verdict": "needs walk-back: residual stream exploded; BP grad at numerical floor"
+  },
+  {
+    "method": "credit_bridge",
+    "seed": 42,
+    "acc": 0.2934,
+    "h_L": 1518098688.0,
+    "g_L": 4.899390892987299e-10,
+    "stability": 0.22219661739137436,
+    "max_per_block": 3210.4938156669996,
+    "verdict": "needs walk-back: residual stream exploded; BP grad at numerical floor"
+  },
+  {
+    "method": "bp",
+    "seed": 123,
+    "acc": 0.6078,
+    "h_L": 392.1978759765625,
+    "g_L": 0.00024487689370289445,
+    "stability": 0.13251967918541696,
+    "max_per_block": 1.0077101345860964,
+    "verdict": "trustworthy"
+  },
+  {
+    "method": "dfa",
+    "seed": 123,
+    "acc": 0.3087,
+    "h_L": 1905751040.0,
+    "g_L": 6.39826636117391e-10,
+    "stability": 0.3624845700131522,
+    "max_per_block": 6397.1934401457265,
+    "verdict": "needs walk-back: residual stream exploded; BP grad at numerical floor; BP grad direction is drift-dominated"
+  },
+  {
+    "method": "state_bridge",
+    "seed": 123,
+    "acc": 0.2194,
+    "h_L": 148185072.0,
+    "g_L": 3.956185157250047e-09,
+    "stability": 0.8785928308963775,
+    "max_per_block": 29735.815245576912,
+    "verdict": "needs walk-back: residual stream exploded; BP grad at numerical floor; BP grad direction is drift-dominated"
+  },
+  {
+    "method": "credit_bridge",
+    "seed": 123,
+    "acc": 0.2964,
+    "h_L": 1807671936.0,
+    "g_L": 3.837697937214557e-10,
+    "stability": 0.41688133887946605,
+    "max_per_block": 3153.5449714728416,
+    "verdict": "needs walk-back: residual stream exploded; BP grad at numerical floor; BP grad direction is drift-dominated"
+  },
+  {
+    "method": "bp",
+    "seed": 456,
+    "acc": 0.5999,
+    "h_L": 399.59320068359375,
+    "g_L": 0.00025932700373232365,
+    "stability": 0.16695057782861922,
+    "max_per_block": 1.00708821368371,
+    "verdict": "trustworthy"
+  },
+  {
+    "method": "dfa",
+    "seed": 456,
+    "acc": 0.3089,
+    "h_L": 2366543872.0,
+    "g_L": 7.316194317041891e-10,
+    "stability": 0.0037845497330029807,
+    "max_per_block": 7689.343169756613,
+    "verdict": "needs walk-back: residual stream exploded; BP grad at numerical floor"
+  },
+  {
+    "method": "state_bridge",
+    "seed": 456,
+    "acc": 0.1897,
+    "h_L": 3785490944.0,
+    "g_L": 1.2351282496769755e-10,
+    "stability": 0.24546371698379515,
+    "max_per_block": 7539.8150194888,
+    "verdict": "needs walk-back: residual stream exploded; BP grad at numerical floor"
+  },
+  {
+    "method": "credit_bridge",
+    "seed": 456,
+    "acc": 0.3069,
+    "h_L": 1116727552.0,
+    "g_L": 6.332067647996098e-10,
+    "stability": 0.21998102739453315,
+    "max_per_block": 2883.5489333321184,
+    "verdict": "needs walk-back: residual stream exploded; BP grad at numerical floor"
+  }
+]
\ No newline at end of file