tablet 58: the tool's answer is given — tool results are sources; markers on word boundaries

The sugya reply came back lo_tov — golden_calf on two sentences the
builder had just read from tool output (the Mishnah's reasons, from the
second scroll; the commit and pod, from its own tools). The gate's
sources were only the user turns' text and document blocks; a
tool_result block and a tool turn — what the model was GIVEN (tablet
49) — were not counted. And "shorashim-675b…" was vital because the
insight markers matched "Rashi" inside it.

- Shape.sources: Anthropic tool_result blocks (string or blocks) inside
  a user turn, and OpenAI role "tool" turns, are sources; the query is
  still the last user turn. gate_test: both shapes.
- zerikah._INSIGHT_MARKERS: \b…\b. test_zerikah: the pod name is not
  Rashi; "Rashi reads" and "The Mishnah records" are; "Rambanovich" and
  "talmudic_engine" are not.
- Tablet 58 in the Broken Tablets.

Elixir 643/0, korban 294/0. Doorpost pin unchanged.

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

vav_pipeline/test/gate_test.exs

@@ -248,6 +248,37 @@ defmodule VavPipeline.GateTest do
   # The shape
   # ------------------------------------------------------------
 
+  # Tablet 58: what a tool returned to the model was given to it — a source.
+  test "tool results are sources: a user turn's tool_result blocks (Anthropic) and a tool turn (OpenAI)" do
+    anthropic = %{
+      "system" => "S",
+      "messages" => [
+        %{"role" => "user", "content" => "Read the file."},
+        %{"role" => "assistant", "content" => [%{"type" => "tool_use", "id" => "t1", "name" => "read", "input" => %{}}]},
+        %{"role" => "user", "content" => [
+          %{"type" => "tool_result", "tool_use_id" => "t1", "content" => "commit dc938058 on main"},
+          %{"type" => "tool_result", "tool_use_id" => "t2", "content" => [%{"type" => "text", "text" => "Eduyot 1:5: why the minority is recorded"}]}
+        ]},
+        %{"role" => "user", "content" => "What did you find?"}
+      ]
+    }
+
+    assert [%{id: "system", text: "S"}, %{id: "user_1", text: "Read the file."},
+            %{id: "user_2", text: "commit dc938058 on main\nEduyot 1:5: why the minority is recorded"},
+            %{id: "user_3", text: "What did you find?"}] = Shape.sources(:anthropic, anthropic)
+    assert Shape.query(:anthropic, anthropic) == "What did you find?"
+
+    openai = %{"messages" => [
+      %{"role" => "user", "content" => "Read it."},
+      %{"role" => "assistant", "content" => nil, "tool_calls" => [%{"id" => "c1"}]},
+      %{"role" => "tool", "tool_call_id" => "c1", "content" => "commit dc938058 on main"},
+      %{"role" => "user", "content" => "And?"}
+    ]}
+    assert [%{id: "user_1", text: "Read it."}, %{id: "user_2", text: "commit dc938058 on main"}, %{id: "user_3", text: "And?"}] = Shape.sources(:openai, openai)
+    # the query is still the last USER turn, not the tool's
+    assert Shape.query(:openai, openai) == "And?"
+  end
+
   test "sources are the system prompt and the user turns, not the assistant's; the query is the last user turn" do
     assert [%{id: "system", text: "Answer from the report."}, %{id: "user_1", text: "Here is the report: revenue rose 4% in Q3."}, %{id: "user_2", text: "What happened to revenue?"}] =
              Shape.sources(:anthropic, body())