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_systems.py

@@ -61,7 +61,7 @@ async def test_count_open_issues_denied_returns_zero():
     assert result == 0
 
 
-# ── assess_system_name — the one gate both doors call (milestone 307) ──
+# ── assess_system_name — the one gate both doors call ──
 
 @pytest.mark.asyncio
 async def test_assess_matches_an_existing_system_on_case_and_spacing():
@@ -128,7 +128,7 @@ async def test_assess_says_nothing_about_a_nameless_system():
     assert await assess_system_name(1, 5, "   ") == {"duplicate": None, "canonical": None}
 
 
-# ── path patterns — the files that ARE the area (milestone 444, #4756) ──
+# ── path patterns — the files that ARE the area ──
 
 def test_patterns_are_tidied_to_repo_relative_and_deduplicated():
     from scribe.services.systems import normalize_path_patterns