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_list_rows_brief.py

@@ -1,9 +1,9 @@
-"""List tools return rows that say what a record is, never what it says (#4061).
+"""List tools return rows that say what a record is, never what it says.
 
-list_tasks once returned every row's to_dict(), body included. A project's todo
-list came to 93-165k characters, past what an MCP client accepts as a tool
-result, so the list arrived as a file to page through — the failure #4045 fixed
-for enter_project, one call over. A list is for choosing which record to open;
+A list that returns every row's to_dict(), body included, runs a project's todo
+list to 93-165k characters, past what an MCP client accepts as a tool result,
+so the list arrives as a file to page through — the same failure enter_project
+avoids by carrying a summary. A list is for choosing which record to open;
 get_task / get_note read one in full.
 """
 import json
@@ -41,7 +41,7 @@ def test_a_task_row_names_what_it_is_and_where_it_sits_but_not_its_body():
     assert row["milestone_title"] == "An existing plan is found"
     assert {"id", "title", "status", "task_kind", "priority", "milestone_id",
             "tags", "updated_at", "project_id"} <= set(row)
-    # Empty optional fields are left off rather than sent as null (#2483).
+    # Empty optional fields are left off rather than sent as null.
     assert not {"description", "parent_id", "due_date"} & set(row)
     assert row["updated_at"] == WHEN.isoformat()