docs(6209): wide net, startup, stamps, slippage, miss route and parity tests

Eight more test files state the property they pin as a present-tense
fact. Incident narratives (a dated storage stall, a week of zero tuning
events, a two-project poisoned ledger, a twenty-site owner audit) become
the failure shape each test defends; one-install figures that name a rule
become a general worked example with the calibration numbers kept. The
family-grouping regression guard is renamed for what it checks.

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

tests/test_wide_net.py

@@ -1,10 +1,10 @@
-"""The wide net: many candidates, no bar, and a cost that stays bounded (#4103).
+"""The wide net: many candidates, no bar, and a cost that stays bounded.
 
 WHY THIS EXISTS
 
-Milestone 416 step 5 moves "do not exclude potentially important data" off the
-push, where fifty candidates would be a wall nobody reads, and onto a pull,
-where they arrive only when a session asks for them.
+"Do not exclude potentially important data" belongs on a pull, not the push:
+fifty candidates pushed would be a wall nobody reads, and pulled they arrive
+only when a session asks for them.
 
 Three things have to hold, and each has a way of quietly failing:
 
@@ -12,13 +12,13 @@ Three things have to hold, and each has a way of quietly failing:
      not trust a threshold to decide for them. A default floor creeping in
      here would turn the wide net into the narrow one and nothing would look
      wrong — the results would simply be fewer.
-  2. **A bounded cost.** The step was filed claiming fifty "costs nothing".
-     `_rule_hint_line` had already measured ~143 tokens for a line with its
-     trigger rendered, so fifty is ~7,000. The graduated shape (#3851) is what
-     keeps this affordable, and a change that renders every trigger in full
+  2. **A bounded cost.** Fifty candidates do not cost nothing: a line with
+     its trigger rendered is ~143 tokens, so fifty is ~7,000. The graduated
+     shape is what keeps this affordable, and a change that renders every trigger in full
      would pass every other test here.
   3. **A pull, logged as one.** The push arms' near-miss distributions are the
-     evidence #4121 argues from. A pull mixed into them moves those numbers.
+     evidence their floors are tuned from. A pull mixed into them moves those
+     numbers.
 """
 from unittest.mock import AsyncMock, patch
 
@@ -71,7 +71,7 @@ async def test_the_limit_is_clamped_to_the_cap(asked, expected):
 
 @pytest.mark.asyncio
 async def test_the_head_carries_its_trigger_whole_and_the_tail_is_cut():
-    """The graduated shape (#3851), which is what makes fifty affordable.
+    """The graduated shape, which is what makes fifty affordable.
 
     A regression that rendered every trigger in full would satisfy every other
     assertion in this file, so the cut is pinned on both sides: the head is
@@ -104,8 +104,7 @@ async def test_a_short_trigger_is_never_marked_truncated():
 
 
 def test_the_cut_breaks_on_a_word_and_says_it_was_cut():
-    """#4036's lesson, borrowed: a raw slice ends mid-word and reads as the
-    whole thing."""
+    """A raw slice ends mid-word and reads as the whole thing."""
     text, cut = wide_net._teaser("alpha beta gamma delta " * 40)
     assert cut is True
     assert text.endswith("…")
@@ -152,7 +151,7 @@ async def test_the_call_is_logged_under_its_own_pull_source():
 
 
 def test_the_wide_net_is_not_one_of_the_tunable_push_surfaces():
-    """THE GUARD that keeps #4121's evidence clean (rule 167).
+    """THE GUARD that keeps the push arms' tuning evidence clean.
 
     The registry holds the PUSH arms — the ones with a floor and a budget the
     model tunes. This source must not appear there: a pull folded into those
@@ -175,7 +174,7 @@ def test_the_wide_net_is_not_ambient_either():
 
 @pytest.mark.asyncio
 async def test_a_search_that_never_ran_is_not_reported_as_a_decline():
-    """#3765: an empty query, a dead embedder and a failed query all return
+    """An empty query, a dead embedder and a failed query all return
     nothing, and none of them is a ranker declining."""
     with _patched([], report={"searched": False, "best_available_score": None}), \
          patch.object(wide_net, "record_retrieval") as rec, \
@@ -189,7 +188,7 @@ async def test_a_search_that_never_ran_is_not_reported_as_a_decline():
 @pytest.mark.asyncio
 async def test_what_the_bar_turned_away_is_carried_through():
     """There is no bar here, but `best_available` still answers "did the corpus
-    have anything at all" for a call that came back empty (#3670)."""
+    have anything at all" for a call that came back empty."""
     with _patched([], report={"searched": True, "best_available_score": 0.31,
                               "best_available_id": 7}), \
          patch.object(wide_net, "record_retrieval") as rec, \
@@ -230,7 +229,7 @@ def test_it_is_registered_and_readable_with_a_read_key():
 
 
 def test_the_instruction_surfaces_point_at_it():
-    """Rule 119: the instruction surfaces ARE the specification for product
+    """The instruction surfaces ARE the specification for product
     behaviour, so a tool the reflex never learns about is not shipped."""
     import pathlib