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_forge_token_sealing.py

@@ -1,4 +1,4 @@
-"""Forge-connection tokens are stored sealed (milestone 523, #5877).
+"""Forge-connection tokens are stored sealed.
 
 Migration 0122 seals the rows that existed before, with its OWN frozen copy of
 the v1 key derivation (so a later edit to services/secrets.py can never change