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_backup_file_restore.py

@@ -101,7 +101,7 @@ async def test_the_tar_restores_with_every_id_remapped(written):
     assert (note.project_id, note.milestone_id) == (project.id, milestone.id)
     assert note.body == "From the tar, not the JSON."
     assert note.status == "todo"
-    # The Profile page travels with its user (#5879); a field left blank stays
+    # The Profile page travels with its user; a field left blank stays
     # blank rather than restoring as the page's default.
     assert (profile.display_name, profile.tone) == ("Drill Owner", "technical")
     assert profile.interests == ["backups"]