gate: tablet 52 — the fringe quoted couplings as sentences on the first real reply

checks.grounding.ungrounded holds coupling strings ("coupled(claim(1),
not_in_sources)"), not sentences; the fringe called Access.get/3 on a
string and the first real reply from Claude through /gate/anthropic
answered 500 CHATAT_UNEXPECTED (after recording its bedikah). The
sentence is now looked up by claim index in the check's claims; a test
produces an ungrounded claim. Broken Tablets tablet 52. Elixir 593/0.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

specs/broken_tablets/README.md

@@ -54,3 +54,21 @@ interpretations still ground in L1 alone.
 
 The first tablets are in the git history before `tablet 49`. The
 difference between the two is the correction.
+
+## Tablet 52 — the first real reply through the gate (2026-10-13)
+
+The gate (bishe'arecha §I) passed every test — fourteen of them, with a
+local model double and examination doubles — and crashed on the first
+real reply from Claude. The fringe quotes the sentence each rule fired
+on; for the grounding rules it read `checks.grounding.ungrounded`, which
+holds coupling strings (`coupled(claim(1), not_in_sources)`), not
+sentences. No double had ever produced an ungrounded claim, so the path
+through `Access.get/3` on a string was never taken. The shape was in the
+Tamid contract all along ("ungrounded": [...]); the builder wrote the
+reader from memory of what it should hold.
+
+Fixed: the claim's sentence is looked up by index in the check's
+`claims`; a test now produces an ungrounded claim. The lesson is the one
+from Day 6 and tablets 41 and 50 again, one layer out: a double shaped
+by the builder tests the builder's picture of the wire. The first real
+message is the test. Run it before calling the gate built.

vav_pipeline/lib/vav_pipeline/gate/shape.ex

@@ -191,6 +191,8 @@ defmodule VavPipeline.Gate.Shape do
   end
 
   defp sentences_for(checks, rule) do
+    grounding = checks[:grounding] || %{}
+
     claims_of = fn
       %{claims: claims} when is_list(claims) -> Enum.map(claims, &(&1["sentence"] || &1[:sentence]))
       _ -> []
@@ -198,8 +200,8 @@ defmodule VavPipeline.Gate.Shape do
 
     case rule do
       "avodah_zarah" -> claims_of.(checks[:authority])
-      "golden_calf" -> ungrounded_sentences(checks[:grounding])
-      "self_grounding" -> ungrounded_sentences(checks[:grounding])
+      "golden_calf" -> ungrounded_sentences(grounding)
+      "self_grounding" -> ungrounded_sentences(grounding)
       "shfichut_damim" -> action_sentences(checks[:actions], "shfichut_damim")
       "gilui_arayot" -> action_sentences(checks[:actions], "gilui_arayot")
       "parah_adumah" -> claims_of.(checks[:self_validation])
@@ -211,7 +213,33 @@ defmodule VavPipeline.Gate.Shape do
     |> Enum.reject(&is_nil/1)
   end
 
-  defp ungrounded_sentences(%{ungrounded: list}) when is_list(list), do: Enum.map(list, &(&1[:sentence] || &1["sentence"]))
+  # The grounding check's `ungrounded` are coupling strings —
+  # "coupled(claim(3), not_in_sources)" — not sentences; the claim's
+  # sentence is in the check's `claims` by index. (Tablet 52: the first
+  # real reply through the gate found this; no test double had an
+  # ungrounded claim.)
+  defp ungrounded_sentences(%{ungrounded: list} = grounding) when is_list(list) do
+    claims = grounding[:claims] || []
+
+    Enum.map(list, fn
+      coupling when is_binary(coupling) ->
+        case Regex.run(~r/claim\((\d+)\)/, coupling) do
+          [_, n] ->
+            i = String.to_integer(n)
+            Enum.find_value(claims, coupling, fn c -> if (c[:index] || c["index"]) == i, do: c[:sentence] || c["sentence"] end)
+
+          _ ->
+            coupling
+        end
+
+      %{} = c ->
+        c[:sentence] || c["sentence"]
+
+      other ->
+        to_string(other)
+    end)
+  end
+
   defp ungrounded_sentences(_), do: []
 
   defp action_sentences(%{actions: actions}, rule) when is_list(actions) do

vav_pipeline/test/gate_test.exs

@@ -191,6 +191,17 @@ defmodule VavPipeline.GateTest do
     refute Map.has_key?(pass.shorashim, :rebuked)
   end
 
+  test "tablet 52: an ungrounded claim's sentence reaches the fringe (the grounding check lists couplings, not sentences)" do
+    forward = fn _, _, _, _ -> {:ok, 200, %{"model" => "claude-test", "content" => [%{"type" => "text", "text" => "Revenue rose 9% to 14M."}]}} end
+    examiner = fn _o, _p, _q, _s -> {:ok, %{plain() | "sources" => [%{"id" => "user_1", "length" => 40}], "claims" => [%{"index" => 1, "sentence" => "Revenue rose 9% to 14M.", "anchors" => [], "self_reference" => nil, "hedged" => false, "invokes" => []}]}} end
+    checker = fn ref, _c, _trace, _g -> {:ok, %{"status" => "halt", "violations" => ["halt(golden_calf,#{ref},uncoupled(claim(1)),...)"]}} end
+    assert {:ok, pass} = Gate.pass(:anthropic, body(), "sk-good", opts(forward: forward, examiner: examiner, interpretation_checker: checker))
+    assert pass.bedikah.verdict == :lo_tov
+    [%{"text" => text}] = pass.reply["content"]
+    assert text =~ "golden_calf (Shemot 32:4): \"Revenue rose 9% to 14M.\""
+    assert Shape.rebuke_text(pass.bedikah, pass.shorashim.anchors) =~ "golden_calf (Shemot 32:4)"
+  end
+
   test "rebuke once: the second reply is examined, linked to the first, and is the one delivered" do
     assert {:ok, pass} = Gate.pass(:anthropic, body(), "sk-good", opts(rebuke: :once))
     assert pass.first.verdict == :lo_tov