Add protocol decision-utility ablation table

Builds on the 5-method audit JSON. For each method, evaluates 7 reporting
strategies (S0=acc only, S1=+Γ field standard, S2-S5=+single diagnostic,
S_full=full protocol), and emits the verdict each strategy would have
reached.

Result: 3 of 5 methods (DFA/SB/CB) are walked back by S_full but NOT by S1.
Each of (a)scale, (b)floor, (d)frozen is independently sufficient for
binary detection of those 3 failures. Diagnostic (c)stability adds
sub-mode discrimination (drift vs noise) but not new positive detections.

This is the §3 protocol decision-utility evidence.

1 files changed, 69 insertions, 0 deletions

diff --git a/results/protocol_audit/ablation_decision_utility.json b/results/protocol_audit/ablation_decision_utility.json
new file mode 100644
index 0000000..06f4b66
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+++ b/results/protocol_audit/ablation_decision_utility.json
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+{
+  "table": {
+    "bp": {
+      "S0": "no walk-back (acc only)",
+      "S1": "no walk-back (looks fine)",
+      "S2": "no walk-back",
+      "S3": "no walk-back",
+      "S4": "no walk-back",
+      "S5": "no walk-back",
+      "S_full": "no walk-back"
+    },
+    "dfa": {
+      "S0": "no walk-back (acc only)",
+      "S1": "no walk-back (looks fine)",
+      "S2": "WALK-BACK: (a)scale",
+      "S3": "WALK-BACK: (b)floor",
+      "S4": "no walk-back",
+      "S5": "WALK-BACK: (d)passive",
+      "S_full": "WALK-BACK: (a)scale + (b)floor + (d)passive"
+    },
+    "state_bridge": {
+      "S0": "no walk-back (acc only)",
+      "S1": "no walk-back (looks fine)",
+      "S2": "WALK-BACK: (a)scale",
+      "S3": "WALK-BACK: (b)floor",
+      "S4": "WALK-BACK: (c)drift",
+      "S5": "WALK-BACK: (d)passive",
+      "S_full": "WALK-BACK: (a)scale + (b)floor + (c)drift + (d)passive"
+    },
+    "credit_bridge": {
+      "S0": "no walk-back (acc only)",
+      "S1": "no walk-back (looks fine)",
+      "S2": "WALK-BACK: (a)scale",
+      "S3": "WALK-BACK: (b)floor",
+      "S4": "WALK-BACK: (c)drift",
+      "S5": "WALK-BACK: (d)passive",
+      "S_full": "WALK-BACK: (a)scale + (b)floor + (c)drift + (d)passive"
+    },
+    "ep": {
+      "S0": "no walk-back (acc only)",
+      "S1": "no walk-back (looks fine)",
+      "S2": "no walk-back",
+      "S3": "no walk-back",
+      "S4": "no walk-back",
+      "S5": "no walk-back",
+      "S_full": "no walk-back"
+    }
+  },
+  "strategies": {
+    "S0": "headline acc only",
+    "S1": "+ \u0393 (field standard)",
+    "S2": "+ diagnostic (a) \u2016h_l\u2016",
+    "S3": "+ diagnostic (b) \u2016g_l\u2016",
+    "S4": "+ diagnostic (c) stability",
+    "S5": "+ diagnostic (d) frozen baseline",
+    "S_full": "full protocol"
+  },
+  "summary": {
+    "missed_by_S1": [
+      "dfa",
+      "state_bridge",
+      "credit_bridge"
+    ],
+    "trustworthy_by_S_full": [
+      "bp",
+      "ep"
+    ]
+  }
+}
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