docs(6209): seventeen more test files — lesson shape and round trip, rule scope/moments/kind/surfacing, drift, deadlock race, backup, inception, backfill, claims, supersession, ledgers, family shapes

Docstrings and comments state the property and its reason in the present
tense. The session-context ledger test no longer describes the decision it
"used to pin"; the supersession tests state demote-not-filter without the
quote; one-row measurements become the general shape with their figures.

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

tests/test_integration_rule_moments.py

@@ -1,4 +1,4 @@
-"""Real-Postgres tests for rule mounts (milestone 458 step 3).
+"""Real-Postgres tests for rule mounts.
 
 A mount is the claim "this rule arrives at this moment". These pin what that
 claim depends on:
@@ -7,7 +7,7 @@ claim depends on:
 - the rule's detail reads its mounts back;
 - a backup carries them, attached to the RESTORED rule's new id rather than
   the old number;
-- the delivery lookup (step 4) answers by home: a project's mounted rule
+- the delivery lookup answers by home: a project's mounted rule
   reaches only work bound to that project, and nobody else's mount arrives.
 """
 import pytest
@@ -150,7 +150,7 @@ async def test_a_backup_carries_the_mounts_to_the_restored_rule(world):
     assert sorted(r["moment"] for r in payload["rule_moments"]) == [
         "reply.report", "work.finish",
     ]
-    # The mount was an edit, so it was also recorded as two judgments (step 7)
+    # The mount was an edit, so it was also recorded as two judgments
     # — and those travel too, onto the restored rule.
     payload["rule_moment_judgments"] = [
         row for row in exported["rule_moment_judgments"] if row["rule_id"] == rule.id
@@ -238,7 +238,7 @@ async def test_the_delivery_lookup_answers_by_home(world):
 
 
 async def test_moment_usage_counts_deliveries_and_the_agent_opens_that_followed(world):
-    """The per-moment readout (step 6), on real SQL: an EXISTS inside a
+    """The per-moment readout, on real SQL: an EXISTS inside a
     COUNT(CASE …) is a shape no mock can vouch for, and the block's own guard
     would turn a database refusal into a quiet `moment_usage_failed`."""
     from datetime import datetime, timedelta, timezone