docs(6209): coverage, guidance-ownership, shape, warnings tests and shared fixtures

test_pattern_coverage, test_guidance_ownership, test_integration_shape_classify,
test_instruction_surfaces_agree, test_retrieval_warnings, helpers.py and
conftest.py state the property each test or fixture holds. The issue and
milestone numbers, consolidation dates and one-install measurements that
recorded how each was found are dropped; fixture dates and ids stay.

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

tests/test_retrieval_warnings.py

@@ -1,4 +1,4 @@
-"""`retrieval_telemetry` says what is wrong, rather than implying it (#3431).
+"""`retrieval_telemetry` says what is wrong, rather than implying it.
 
 WHY THIS IS TESTED AS ARITHMETIC AND NOT THROUGH THE DATABASE. The warnings
 are a pure function of the blocks the readout already built — that is the
@@ -8,12 +8,12 @@ the wrong shape. Every case below is a shape that once produced, or would
 produce, a wrong reading:
 
   * an arm that never declines, which is either a missing floor or a missing
-    LOG (#3497 — the rule arms recorded only their hits, so their decline
-    count was structurally zero and the obvious warning would have sent a
-    reader to move a threshold that was never involved);
+    LOG (an arm that records only its hits has a structurally zero decline
+    count, and the obvious warning would send a reader to move a threshold
+    that was never involved);
   * a search that never declines, which is a search working correctly;
   * a quiet window, where firing every check would describe an empty database
-    rather than a broken one (rule 115);
+    rather than a broken one;
   * a floor the band is sitting on, which is the case where tuning changes
     volume while looking like it changes quality.
 
@@ -76,7 +76,7 @@ def test_the_warning_carries_the_numbers_that_produced_it() -> None:
 
 
 def test_a_quiet_window_flags_nothing() -> None:
-    """Three calls returning nothing is an afternoon, not a defect (rule 115)."""
+    """Three calls returning nothing is an afternoon, not a defect."""
     assert codes(warn({"auto_inject": src(calls=3, zero_result_calls=0)})) == set()
 
 
@@ -98,7 +98,7 @@ def test_an_arm_that_does_decline_is_not_flagged() -> None:
 
 
 def test_an_arm_not_known_to_log_unconditionally_is_exempt(monkeypatch) -> None:
-    """#3497: a structurally-zero decline count is a logging bug, not a floor.
+    """A structurally-zero decline count is a logging bug, not a floor.
 
     Flagging it would report a ranking problem and send the reader to a
     threshold that was never involved.
@@ -183,7 +183,7 @@ def test_records_shown_and_never_opened_are_reported_per_corpus() -> None:
 
 
 def test_each_corpus_is_sent_only_to_a_tool_that_takes_it() -> None:
-    """#4798: one remedy for both corpora sent the rules reader to
+    """One remedy for both corpora would send the rules reader to
     `menus_to_review`, which refuses every source but the notes menu. Tied to
     `REVIEWABLE` itself, so it goes red in either direction: the rules text
     naming the tool while no rule arm is reviewable, or a rule arm becoming
@@ -231,7 +231,7 @@ def test_an_unregistered_source_gets_no_other_verdict() -> None:
 
 
 def test_every_registered_source_stays_quiet_when_healthy() -> None:
-    """The negative control for the whole suite (rule 167).
+    """The negative control for the whole suite.
 
     A guard that cannot pass cleanly is not a guard — if a healthy window
     produced warnings, every assertion above would be meaningless.
@@ -256,7 +256,7 @@ def test_a_point_that_emitted_is_not_reported() -> None:
 
 
 def test_a_deliberately_quiet_point_is_never_reported() -> None:
-    """A justified silence must not read as a gap (#2475)."""
+    """A justified silence must not read as a gap."""
     quiet = {p["source"] for p in _silent_surfaces({}, {}, {}, active=True)}
     for web_only in ("rest_search", "browse_search", "rest_note", "rest_rule"):
         assert web_only not in quiet
@@ -264,7 +264,7 @@ def test_a_deliberately_quiet_point_is_never_reported() -> None:
 
 def test_an_inactive_window_reports_no_silence_at_all() -> None:
     """On a fresh install every point is silent; the list would be the
-    registry printed back (rule 115)."""
+    registry printed back."""
     assert _silent_surfaces({}, {}, {}, active=False) == []
 
 
@@ -292,14 +292,13 @@ def test_a_setting_falls_back_rather_than_raising(raw, fallback, want) -> None:
     assert _num(raw, fallback) == want
 
 
-# ── read_and_unacted / outcomes_never_recorded (#4213, milestone 419) ─────
+# ── read_and_unacted / outcomes_never_recorded ──────────────────────────
 #
-# The pair exists because ZERO OUTCOMES IS AMBIGUOUS, and getting that wrong
-# would have been this milestone's own failure mode in miniature: a window
-# with no outcome rows cannot tell "every rule was ignored" from "nothing
-# reports outcomes yet". Reporting the first when the truth is the second
-# manufactures a finding out of an unwired feature — #3311, where a statistic
-# that could not vary was read as a fact about the corpus.
+# The pair exists because ZERO OUTCOMES IS AMBIGUOUS: a window with no outcome
+# rows cannot tell "every rule was ignored" from "nothing reports outcomes
+# yet". Reporting the first when the truth is the second manufactures a
+# finding out of an unwired feature — a statistic that cannot vary, read as a
+# fact about the corpus.
 
 def ru(**kw) -> dict:
     base = {
@@ -358,7 +357,7 @@ def test_every_opened_rule_acted_on_reports_nothing() -> None:
 def test_no_rules_opened_at_all_reports_neither() -> None:
     """Silence is not a finding. A window where nothing was opened has nothing
     to say about outcomes, and saying it anyway would put a warning on every
-    fresh install (rule 115)."""
+    fresh install."""
     ws = warn({}, rule_usage=ru(distinct_rules_surfaced=12))
     assert "read_and_unacted" not in codes(ws)
     assert "outcomes_never_recorded" not in codes(ws)
@@ -367,7 +366,7 @@ def test_no_rules_opened_at_all_reports_neither() -> None:
 def test_an_absent_rule_usage_block_is_not_a_finding() -> None:
     """A failed rule-usage read leaves the keys missing or zero. Neither may
     become a warning, because a warning computed over rows that could not be
-    loaded describes the outage, not the corpus (#2663)."""
+    loaded describes the outage, not the corpus."""
     assert "read_and_unacted" not in codes(warn({}, rule_usage={}))
     assert "outcomes_never_recorded" not in codes(warn({}, rule_usage={}))
     assert "outcomes_never_recorded" not in codes(
@@ -375,7 +374,7 @@ def test_an_absent_rule_usage_block_is_not_a_finding() -> None:
     )
 
 
-# ── floor_moved_mid_window (#4225) ────────────────────────────────────────
+# ── floor_moved_mid_window ────────────────────────────────────────────────
 #
 # WHY THE BAND CHECK IS SUSPENDED RATHER THAN SOFTENED.
 #
@@ -481,16 +480,10 @@ def test_a_quiet_arm_is_not_suspended_either_way() -> None:
 # floor row, "no move recorded" and "no move" are different statements, and
 # the first was standing in for the second.
 #
-# It showed up the day this instance's ledger was seeded. Its earliest event
-# of any kind is 2026-09-17; `write_path_rule`'s only floor row is a release
-# baseline written 2026-09-21; a 30-day window opens 2026-08-22. The readout
-# printed that arm's band as "-0.0208 above its floor" — the impossible
-# negative the section above exists to prevent — with the suspension silent,
-# because there was nothing on record for it to notice.
-#
-# The distinction is not academic for #4261: every window for the next month
-# opens before that date, and measuring a change against an instrument that
-# reports a number it cannot support is the #4225 trap one level up.
+# The case: an arm whose first floor row is dated inside the window. Without
+# this check the readout prints its band as a negative distance above its
+# floor — the impossible number the section above exists to prevent — with
+# the suspension silent, because there is nothing on record for it to notice.
 
 GAP_FROM = "2026-09-21T11:58:00+00:00"