Test competing navigation ownership and review research thread

Assistant: codex
Assistant-Model: gpt-6-astra
Assistant-Session: 01a0cffe-206f-7323-89d3-b20ca4cf4bf9

research/evolution/ledger.json

@@ -410,6 +410,46 @@
         "cost_usd": null
       },
       "supersedes": []
+    },
+    {
+      "id": "LEARN-0013",
+      "date": "2026-09-27",
+      "recording": "prospective",
+      "stream": "F",
+      "comparison_group": "F-navigation-ownership-v1",
+      "protocol_ref": "research/evolution/cycles/2026-09-27-navigation-ownership.md",
+      "question": "Can obsolete history/navigation completions affect newer intent, and does separating completion ownership from focus ownership prevent it?",
+      "previous_belief": "The single-response continuation policy preserved newer search focus but left competing history/success/error completions unresolved; focus-at-swap alone might not be sufficient.",
+      "conclusion": "Revise operational guidance: validate navigation ownership before content/URL/title/feedback effects, including stale errors and newer failure, independently of focus permission. Prior policy misses obligations in 12/12 adversarial rows; authored guard meets 12/12. Pause fixture work for independent source contrast.",
+      "disposition": "revision",
+      "affected_patterns": [
+        "CAND-0009",
+        "CAND-0010",
+        "CAND-0016"
+      ],
+      "evidence": [
+        "research/reviews/NavigationOwnershipExperiment.md",
+        "research/reviews/NavigationThreadReview.md",
+        "research/experiments/navigation-history/ownership-result.json",
+        "research/evolution/cycles/2026-09-27-navigation-ownership-effort.json"
+      ],
+      "remaining_uncertainty": [
+        "One authored htmx family and author-model review, not production recurrence or AT validation.",
+        "History adapter is pinned implementation-dependent; pending-state, multiple-miss and lifecycle limits remain open.",
+        "Three distinct protocols are not a comparable diminishing-returns window."
+      ],
+      "reviewer": {
+        "name": "Codex",
+        "role": "author-model",
+        "independent_human": false
+      },
+      "effort": {
+        "research_minutes": 13.918,
+        "execution_minutes": 1.238,
+        "reported_tokens": null,
+        "cost_usd": null
+      },
+      "supersedes": []
     }
   ]
 }