Measure navigation history and cache corroboration cycle

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

research/evolution/ledger.json

@@ -1,6 +1,6 @@
 {
   "schema_version": 1,
-  "coverage": "Selected retrospective outcomes, not a complete historical census. All entered 2026-09-26; historical effort unmeasured. Prospective cycles begin after this baseline.",
+  "coverage": "Ten selected retrospective outcomes (not a historical census), followed by prospectively registered bounded cycles. Retrospective effort remains unknown.",
   "events": [
     {
       "id": "LEARN-0001",
@@ -336,6 +336,43 @@
         "cost_usd": null
       },
       "supersedes": []
+    },
+    {
+      "id": "LEARN-0011",
+      "date": "2026-09-27",
+      "recording": "prospective",
+      "stream": "B",
+      "comparison_group": "B-navigation-mechanism-v1",
+      "protocol_ref": "research/evolution/cycles/2026-09-27-navigation.md",
+      "question": "Can a public route preserve selection and complete-document availability across native/enhanced entry, history and HTTP caching?",
+      "previous_belief": "Native href/GET contracts plus representation-aware routing and cache selection should satisfy this narrow obligation; documentary support lacked runtime checks.",
+      "conclusion": "Corroborated in pinned htmx fixture: native and history paths work; missing Vary reproduces fragment-as-document reuse in both browsers. Existing obligations stand; no new pattern or promotion.",
+      "disposition": "corroboration",
+      "affected_patterns": [
+        "CAND-0009",
+        "CAND-0010"
+      ],
+      "evidence": [
+        "research/reviews/NavigationHistoryExperiment.md",
+        "research/experiments/navigation-history/result.json",
+        "research/evolution/cycles/2026-09-27-navigation-effort.json"
+      ],
+      "remaining_uncertainty": [
+        "One authored application, no independent recurrence or usefulness gain.",
+        "Accessibility, delayed scripts, interrupted transport, real intermediaries and offline availability remain open."
+      ],
+      "reviewer": {
+        "name": "Codex",
+        "role": "author-model",
+        "independent_human": false
+      },
+      "effort": {
+        "research_minutes": 6.177,
+        "execution_minutes": 1.021,
+        "reported_tokens": null,
+        "cost_usd": null
+      },
+      "supersedes": []
     }
   ]
 }