docs(6209): forty test files — design cascade and stylesheet, embeddings, family canon, forge, backup round trips, inception, placement, platforms, moments, rule move and verification, search scope, facets

Module and test docstrings state what is pinned without the record number
or step that introduced it. Incident accounts become the failure shape in
the present tense: the pipefail head, the code_shapes import, the export
order, the facet dialects, the cross-kind repeat, the write-once kind.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_integration_task_kind_spike.py

@@ -1,6 +1,6 @@
 """Real-Postgres test that the CHECK actually accepts 'spike' (0091).
 
-Rule 36 exists because the value and the constraint can drift apart: the
+The value and the constraint can drift apart: the
 code starts writing a new kind while the database still refuses it, and
 nothing catches it until a write fails in front of someone. A mock cannot
 show that — it has no CHECK — so the constraint gets its own real-DB test,
@@ -68,19 +68,18 @@ async def test_an_unknown_kind_is_still_refused(owner_id):
 
     Without this, every assertion above would pass just as happily against a
     table whose CHECK had been dropped and never re-added — which is exactly
-    the failure rule 36 is written against.
+    the drift this file is written against.
     """
     with pytest.raises(IntegrityError):
         await _write(owner_id, "investigation")
 
 
 async def test_a_kind_can_be_corrected_after_the_fact(owner_id):
-    """The write-once bug, asserted against a real column (#3129).
+    """A kind is not write-once, asserted against a real column.
 
     The read-back is the whole test. A version that only asserted the update
-    call succeeded would have passed against the broken code — the route
-    returned 200 while dropping the field, which is exactly how this survived
-    long enough to be found by hand.
+    call succeeded would pass against a route that returns 200 while dropping
+    the field, which is a failure nothing else reports.
     """
     from scribe.services import notes as notes_svc