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_autoinject_context.py

@@ -1,8 +1,8 @@
-"""The auto-inject query carries the conversation beside a thin prompt (#4364).
+"""The auto-inject query carries the conversation beside a thin prompt.
 
-The notes arm used to retrieve against the operator's typed words alone, and a
-mid-session follow-up — "yes do that", "now fix the filter" — names nothing a
-record can match. The hook now reads the tail of the last assistant reply out
+The operator's typed words alone are a poor query: a mid-session follow-up —
+"yes do that", "now fix the filter" — names nothing a record can match. The
+hook reads the tail of the last assistant reply out
 of the transcript and sends it as `ctx`; the server appends it to a SHORT
 prompt only. Two halves, pinned separately: what the server builds, and what
 the hook extracts.
@@ -103,10 +103,10 @@ def test_no_transcript_is_silence_not_failure(tmp_path):
     assert recent(tmp_path, []) == ""
 
 
-# --- what a menu line carries (#4364) ----------------------------------------
+# --- what a menu line carries -----------------------------------------------
 #
 # The name, the kind and System, and the WHOLE matched passage — once. A repeat
-# is a pointer. These pin the shape against the three ways it had gone wrong:
+# is a pointer. These pin the shape against the three ways it goes wrong:
 # a trigger-composed title rendered as the line (1,500+ chars), the passage cut
 # to its head (which was the title again), and a `seen` repeat re-rendered whole.