docs(6209): forge, dedup, tuning, registry, reply shapes and discipline, checkpoint, lesson kind tests

Eight more test files state their properties without issue, milestone,
rule and decision numbers. The tuning and suspension notes describe the
symptom a shipped default or a late ledger produces instead of one
install's dated readings; the reply-discipline and checkpoint docstrings
state the failure they prevent instead of the session that measured it.
test_empty_selector_is_the_rule_115_baseline is renamed for what it
checks: the no-forge baseline.

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

tests/test_reply_shapes.py

@@ -1,4 +1,4 @@
-"""The default reply shapes and the moments they ride (milestone 500 step 1).
+"""The default reply shapes and the moments they ride.
 
 What this pins is what delivery will depend on: every shape rides a moment that
 exists, the core is small enough to pay for on every turn, no slice grows back
@@ -15,7 +15,7 @@ _REAL_RECORD = reply_shapes.record_delivery
 
 
 def test_there_is_a_core_and_at_least_one_slice():
-    """The sweeps below are vacuous over an empty catalog (rule 167)."""
+    """The sweeps below are vacuous over an empty catalog."""
     assert reply_shapes.CORE_KEY in reply_shapes.SHAPES
     assert len(reply_shapes.SHAPES) >= 2
 
@@ -74,16 +74,16 @@ def test_every_shape_says_what_it_is_and_when_it_arrives(key):
 
 
 def test_the_core_carries_the_length_discipline():
-    """Milestone 409's live read: replies that had every section were still
-    too long. Delivery cannot fix that; the core has to say it."""
+    """A reply that has every section can still be too long. Delivery cannot
+    fix that; the core has to say it."""
     text = reply_shapes.core().text.lower()
     assert "shortest reply that carries the answer" in text
     assert "what can go" in text
 
 
 def test_who_decides_what_rides_every_reply_and_every_ask():
-    """The operator's line (milestone 500 step 2): the agent settles what
-    only it can see, the operator decides direction. A one-liner every turn,
+    """Who decides: the agent settles what only it can see, the operator
+    decides direction. A one-liner every turn,
     in full where a question is about to be handed back."""
     core = reply_shapes.core().text.lower()
     asks = reply_shapes.SHAPES["asks"].text.lower()
@@ -130,7 +130,7 @@ def test_the_tool_is_registered_as_a_read():
 
 
 def test_both_doors_read_one_catalog():
-    """Rule 33 parity: the session and the Settings view cannot show
+    """Parity: the session and the Settings view cannot show
     different defaults."""
     from scribe.mcp.tools import moments as tool
     from scribe.routes import retrieval as routes
@@ -158,7 +158,7 @@ async def test_the_route_returns_the_operators_overview_with_a_bounded_window():
         assert view.await_args.kwargs == {"days": days}
 
 
-# ── the operator's view (milestone 500 step 5) ──────────────────────────
+# ── the Settings view ───────────────────────────────────────────────────
 
 
 async def test_the_overview_lists_the_preferences_mounted_on_each_shapes_moment():
@@ -226,7 +226,7 @@ async def test_delivery_counts_tally_each_shape_by_form_and_skip_what_does_not_p
     assert "bogus" not in counts
 
 
-# ── delivery (milestone 500 step 3) ─────────────────────────────────────
+# ── delivery ────────────────────────────────────────────────────────────
 
 
 @pytest.mark.parametrize("key", list(reply_shapes.SHAPES))