test: two tests that had to move with the chunk-carrying select (#4243)

test_chunking::test_search_collapses_chunk_rows_to_best_chunk_per_note feeds
rows straight into the real semantic_search_notes, so widening the select to
carry chunk_index/chunk_text broke its 2-tuple fakes. I had claimed no unit
test did this after grepping test_embeddings.py, which was the wrong file.
Rows are 4-tuples now, and the test additionally asserts the winning chunk is
REPORTED and not merely used for scoring — the property #4243 exists for, and
this is where it belongs, beside the collapse it comes from.

test_task_work_log_surface's ACL test asserted "task_logs.user_id" was absent
from the compiled statement. It is present in every SELECT as a projected
column; the claim was about the WHERE clause. Asserts on stmt.whereclause now,
which is what was actually meant and still fails if an owner filter returns.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01821k5B3Ysecp9fNYs92Kuy

tests/test_task_work_log_surface.py

@@ -322,9 +322,12 @@ async def test_logs_for_task_is_not_filtered_by_who_wrote_the_entry():
          patch("scribe.services.task_logs.async_session",
                MagicMock(return_value=session)):
         await logs_for_task(7, 42)
-    stmt = str(session.execute.await_args.args[0])
-    assert "task_logs.task_id" in stmt
-    assert "task_logs.user_id" not in stmt
+    # The WHERE clause specifically — `user_id` is a selected COLUMN of the
+    # row and appears in every SELECT, so asserting against the whole compiled
+    # statement tests the projection rather than the scoping.
+    where = str(session.execute.await_args.args[0].whereclause)
+    assert "task_logs.task_id" in where
+    assert "task_logs.user_id" not in where
 
 
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