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_services_knowledge_counts.py

@@ -1,11 +1,10 @@
 """get_knowledge_counts — one number per facet, and an honest total.
 
-Two grouped queries, one per typing axis. It used to be three: a grouped count
-over note_type restricted to ("note", "process"), a scalar count of tasks, and
-a second scalar just for plans. That shape is why `issue` had no number —
-every kind needed a query of its own and nobody added one — and why the "All"
-chip sat ~90 below the list it labelled, since snippets were in the feed but
-in no count (#3128).
+Two grouped queries, one per typing axis. A query per kind — a grouped count
+over note_type restricted to ("note", "process"), a scalar count of tasks, a
+second scalar just for plans — leaves every new kind without a number until
+someone adds its query, and puts the "All" chip below the list it labels,
+since snippets are in the feed but in no count.
 """
 from unittest.mock import AsyncMock, MagicMock, patch
 
@@ -71,9 +70,8 @@ async def test_total_counts_snippets_and_counts_no_task_twice():
 async def test_absent_facets_report_zero_rather_than_missing():
     counts, _ = await _counts([("note", 1)], [])
     assert counts["note"] == 1
-    # `lesson` is here from milestone 385 step 2: a kind added to the facet
-    # table and not to the counts would show an empty chip beside a feed that
-    # has rows in it, which is defect 3b in #3161 repeating itself.
+    # A kind added to the facet table and not to the counts would show an
+    # empty chip beside a feed that has rows in it.
     for key in ("process", "snippet", "lesson", "task", "work", "issue", "spike", "plan"):
         assert counts[key] == 0, key
     assert counts["total"] == 1