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>

korban_processor/test/test_zerikah.py

@@ -184,3 +184,18 @@ class TestZerikah:
         vital1b, _ = zerikah(CLEAN_TORAH_RESPONSE, k1)
         # Same input → same output, regardless of what was processed between
         assert vital1a == vital1b
+
+
+class TestInsightMarkersOnWordBoundaries:
+    """Tablet 58: a marker is a word, not a substring. "shorashim" is not Rashi."""
+
+    def test_pod_name_is_not_rashi(self):
+        assert not is_vital("It lives at specs/sugya.md, commit dc938058, pod shorashim-675b48f47-v4x9c.")
+
+    def test_rashi_as_a_word_is_vital(self):
+        assert is_vital("Rashi reads the verse as a question.")
+        assert is_vital("The Mishnah records the opinion that lost.")
+
+    def test_embedded_markers_are_not_words(self):
+        assert not is_vital("The surname Rambanovich is not a source.")
+        assert not is_vital("The talmudic_engine container restarted.")