Add audit table example: protocol applied to BP/DFA/SB/CB/EP

5-method audit table on 4-block d=256 ResMLP CIFAR-10 seed 42:
  - BP: trustworthy (acc 0.615, h_L=2e2, g_L=4e-4, stab 0.099)
  - DFA: walked back via (a)+(b)+(d) — h_L=4e8, g_L=4e-9, undercuts frozen
  - State Bridge: walked back via all 4 diagnostics — stability 0.992 is the
    cleanest possible drift-dominated case
  - Credit Bridge: walked back via all 4 — stability 0.352, also drift mode
  - EP: trustworthy (acc 0.359, h_L=3e3, g_L=2e-4, stab -0.036) — paper's
    internal control case

This is the §2 audit evidence for the main-track paper. Confirms that
standard headline acc + Γ silently fails on 3 of 5 methods on this
architecture, while the 4-diagnostic protocol catches all three.

1 files changed, 196 insertions, 0 deletions

diff --git a/results/protocol_audit/audit_table_s42.json b/results/protocol_audit/audit_table_s42.json
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+{
+  "reports": {
+    "bp": {
+      "method_name": "BP",
+      "notes": "4-block d=256 ResMLP, CIFAR-10, seed 42",
+      "residual_norms": [
+        251.83087158203125,
+        226.57342529296875,
+        212.16461181640625,
+        205.60723876953125,
+        205.75946044921875
+      ],
+      "bp_grad_norms": [
+        0.0004396044823806733,
+        0.0004709330096375197,
+        0.0004792391264345497,
+        0.00045345001854002476,
+        0.0003701267414726317
+      ],
+      "stability_layer": 2,
+      "cross_batch_stability": 0.09898398886952135,
+      "headline_acc": 0.6149,
+      "frozen_baseline_acc": null,
+      "verdict": "trustworthy",
+      "thresholds": {
+        "g_norm_floor": 1e-07,
+        "h_norm_explosion_ratio": 50.0,
+        "stability_drift_ceiling": 0.3,
+        "frozen_acc_margin_pp": 2.0
+      }
+    },
+    "dfa": {
+      "method_name": "DFA",
+      "notes": "4-block d=256 ResMLP, CIFAR-10, seed 42",
+      "residual_norms": [
+        35824.796875,
+        73202040.0,
+        174312304.0,
+        339040960.0,
+        435299520.0
+      ],
+      "bp_grad_norms": [
+        4.39066155877299e-07,
+        4.1912620041273385e-09,
+        4.183721813433294e-09,
+        4.174094847542165e-09,
+        4.174704582027289e-09
+      ],
+      "stability_layer": 2,
+      "cross_batch_stability": 0.047060725092887876,
+      "headline_acc": 0.3107,
+      "frozen_baseline_acc": 0.349,
+      "verdict": "needs walk-back: residual stream exploded; BP grad at numerical floor; deep blocks fail to beat frozen-random baseline",
+      "thresholds": {
+        "g_norm_floor": 1e-07,
+        "h_norm_explosion_ratio": 50.0,
+        "stability_drift_ceiling": 0.3,
+        "frozen_acc_margin_pp": 2.0
+      }
+    },
+    "state_bridge": {
+      "method_name": "STATE_BRIDGE",
+      "notes": "4-block d=256 ResMLP, CIFAR-10, seed 42",
+      "residual_norms": [
+        906.3201293945312,
+        11583499.0,
+        34872504.0,
+        208111168.0,
+        228665568.0
+      ],
+      "bp_grad_norms": [
+        8.369566785404459e-06,
+        1.996277365634569e-09,
+        1.9812380624983916e-09,
+        1.8405569290891322e-09,
+        1.8411722146893794e-09
+      ],
+      "stability_layer": 2,
+      "cross_batch_stability": 0.99180050028695,
+      "headline_acc": 0.1695,
+      "frozen_baseline_acc": 0.349,
+      "verdict": "needs walk-back: residual stream exploded; BP grad at numerical floor; BP grad direction is drift-dominated; deep blocks fail to beat frozen-random baseline",
+      "thresholds": {
+        "g_norm_floor": 1e-07,
+        "h_norm_explosion_ratio": 50.0,
+        "stability_drift_ceiling": 0.3,
+        "frozen_acc_margin_pp": 2.0
+      }
+    },
+    "credit_bridge": {
+      "method_name": "CREDIT_BRIDGE",
+      "notes": "4-block d=256 ResMLP, CIFAR-10, seed 42",
+      "residual_norms": [
+        13249.662109375,
+        24119914.0,
+        554824896.0,
+        548816832.0,
+        606231552.0
+      ],
+      "bp_grad_norms": [
+        7.185065555859182e-07,
+        1.1024462454045647e-09,
+        9.061909000962487e-10,
+        9.013046420314197e-10,
+        9.011226209665324e-10
+      ],
+      "stability_layer": 2,
+      "cross_batch_stability": 0.3516695586343606,
+      "headline_acc": 0.2562,
+      "frozen_baseline_acc": 0.349,
+      "verdict": "needs walk-back: residual stream exploded; BP grad at numerical floor; BP grad direction is drift-dominated; deep blocks fail to beat frozen-random baseline",
+      "thresholds": {
+        "g_norm_floor": 1e-07,
+        "h_norm_explosion_ratio": 50.0,
+        "stability_drift_ceiling": 0.3,
+        "frozen_acc_margin_pp": 2.0
+      }
+    },
+    "ep": {
+      "method_name": "EP",
+      "notes": "4-block d=256 ResMLP, CIFAR-10, seed 42",
+      "residual_norms": [
+        518.3867797851562,
+        579.6542358398438,
+        680.764892578125,
+        1145.8692626953125,
+        3286.841064453125
+      ],
+      "bp_grad_norms": [
+        0.00022257285309024155,
+        0.00022327345504891127,
+        0.00021209640544839203,
+        0.00021204684162512422,
+        0.00016422539192717522
+      ],
+      "stability_layer": 2,
+      "cross_batch_stability": -0.03589460700750351,
+      "headline_acc": 0.359,
+      "frozen_baseline_acc": null,
+      "verdict": "trustworthy",
+      "thresholds": {
+        "g_norm_floor": 1e-07,
+        "h_norm_explosion_ratio": 50.0,
+        "stability_drift_ceiling": 0.3,
+        "frozen_acc_margin_pp": 2.0
+      }
+    }
+  },
+  "summary": [
+    {
+      "method": "bp",
+      "acc": 0.6149,
+      "h_L": 205.75946044921875,
+      "g_L": 0.0003701267414726317,
+      "stability": 0.09898398886952135,
+      "frozen_acc": null,
+      "verdict": "trustworthy"
+    },
+    {
+      "method": "dfa",
+      "acc": 0.3107,
+      "h_L": 435299520.0,
+      "g_L": 4.174704582027289e-09,
+      "stability": 0.047060725092887876,
+      "frozen_acc": 0.349,
+      "verdict": "needs walk-back: residual stream exploded; BP grad at numerical floor; deep blocks fail to beat frozen-random baseline"
+    },
+    {
+      "method": "state_bridge",
+      "acc": 0.1695,
+      "h_L": 228665568.0,
+      "g_L": 1.8411722146893794e-09,
+      "stability": 0.99180050028695,
+      "frozen_acc": 0.349,
+      "verdict": "needs walk-back: residual stream exploded; BP grad at numerical floor; BP grad direction is drift-dominated; deep blocks fail to beat frozen-random baseline"
+    },
+    {
+      "method": "credit_bridge",
+      "acc": 0.2562,
+      "h_L": 606231552.0,
+      "g_L": 9.011226209665324e-10,
+      "stability": 0.3516695586343606,
+      "frozen_acc": 0.349,
+      "verdict": "needs walk-back: residual stream exploded; BP grad at numerical floor; BP grad direction is drift-dominated; deep blocks fail to beat frozen-random baseline"
+    },
+    {
+      "method": "ep",
+      "acc": 0.359,
+      "h_L": 3286.841064453125,
+      "g_L": 0.00016422539192717522,
+      "stability": -0.03589460700750351,
+      "frozen_acc": null,
+      "verdict": "trustworthy"
+    }
+  ]
+}
\ No newline at end of file