docs(6209): the remaining test files — lessons, reply moment and shape, retrieval specs and scopes, rule doors and judgments, services, snippets, search scope; five tests renamed to their property

Docstrings, section headers and assertion messages drop the record number,
milestone or step that introduced the behaviour, and incident accounts are
restated as the present-tense failure shape. A dead pointer to a design doc
that is not in the repo is removed.

Renamed to the property they check:
  test_the_old_shape_would_be_caught -> test_a_rank_then_scope_query_is_caught
  test_a_ledger_repeat_no_longer_produces_that_case_at_all -> test_a_ledger_repeat_is_counted_not_withheld
  test_the_header_no_longer_promises_once_per_session -> test_the_header_explains_the_seen_marker
  test_the_portal_case_no_longer_stamps_one_canon_onto_a_whole_file -> test_one_canon_is_not_stamped_onto_a_whole_file
  test_the_repos_own_prose_no_longer_defines_with -> test_the_repos_own_prose_does_not_define_with
  test_the_original_regression_create_note_with_content -> test_the_real_server_refuses_content_on_create_note

Fixture and example ids stay: "note 5" in a supersession chain, "rule 156"
in an illustrative question, `#2275` as the hex-versus-citation case,
`#3244` as the example of a bare number, fixed dates in date-filter tests.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_rule_creation_asks_first.py

@@ -1,4 +1,4 @@
-"""Both rule-creation tools run the propose-then-approve loop (#3557).
+"""Both rule-creation tools run the propose-then-approve loop.
 
 WHY THIS EXISTS
 
@@ -38,8 +38,8 @@ prevents a rule earns more than any question that improves one's wording.
 
 WHAT THIS PINS, AND WHAT IT DOES NOT
 
-STRUCTURE, never wording — the same bargain the disambiguator guard (#3123)
-strikes next door. Each element matches a family of synonyms, so the prose
+STRUCTURE, never wording — the same bargain the disambiguator guard
+(test_create_tools_disambiguate) strikes next door. Each element matches a family of synonyms, so the prose
 stays free to be rewritten, reordered or sharpened; only DELETING one fails.
 Pinning phrasing would make every improvement a red build, and a test that
 punishes editing is a test someone deletes.
@@ -76,7 +76,7 @@ _ELEMENTS = {
     ),
     "how it would be enforced": ("enforc",),
     "the answers offered back": ("as written", "talk about it", "discuss"),
-    # The fourth and fifth answers (#3733, #3896). They are what makes the
+    # The fourth and fifth answers. They are what makes the
     # question a ROUTING question rather than a yes/no one: an observation
     # that turns out to be a preference or a lesson has found its home, not
     # failed to become a rule. Written in one pass, because two people each