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_rule_move.py

@@ -1,4 +1,4 @@
-"""Real-Postgres tests for moving a rule between homes (milestone 414, step 3).
+"""Real-Postgres tests for moving a rule between homes.
 
 A rule's home is its reach: a rulebook topic makes it global, a project makes
 it that project's. The alternative to a move — recreate the rule in the other
@@ -84,7 +84,7 @@ async def test_a_project_rule_becomes_global_and_keeps_everything(homes):
 
 
 async def test_a_move_writes_no_version(homes):
-    """A version records what a rule SAID (milestone 323, decision 4). A move
+    """A version records what a rule SAID. A move
     changes where it binds, not a word of it."""
     before = len(await rv_svc.list_versions(homes["rule"]))
     await rulebooks_svc.move_rule(homes["rule"], homes["owner"], topic_id=homes["topic"])