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_family_promotion.py

@@ -1,4 +1,4 @@
-"""The promotion engine against real Postgres (milestone 463 step 3).
+"""The promotion engine against real Postgres.
 
 What the unit lane can't show: a promotion opens the right ledger rows and
 no others, a veto changes nothing but the log, an undo puts back exactly the
@@ -279,9 +279,9 @@ async def test_a_repeat_with_no_shared_platform_is_silent(family):
 
 
 async def test_a_repeat_across_kinds_is_silent(family):
-    """A snippet whose only match is a NOTE is not a repeat (#5130): a dated
-    release log scored 0.83 against a signed-APK CI snippet on shared
-    vocabulary and was opened as a candidate. The stub hands back the
+    """A snippet whose only match is a NOTE is not a repeat: a dated
+    release log can score above the bar against a signed-APK CI snippet on
+    shared vocabulary alone, and would open as a candidate. The stub hands back the
     cross-kind hit directly, so this pins the trigger's own check, not the
     search filter in front of it."""
     async with async_session() as s: