RPF-WP-0015: T02 synthetic sender lane, T03 checklist revision, ops-warden re-acceptance

Addresses round-1 owner review requests from audit-core, rapp-postgres,
railiance-cluster and railiance-infra; refreshes the review contract.

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

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 680842@bnt-lap001
Assistant-Session: 54eb9e8e-7d6b-4f0c-b7a6-a6db62075883

docs/audit-core-database-lease-approval.example.json

@@ -25,5 +25,11 @@
   "synthetic_load": {
     "contract_id": null,
     "driver_revision": null
+  },
+  "synthetic_sender": {
+    "identity": null,
+    "source": null,
+    "tenant": null,
+    "expires_at": null
   }
 }