feat: per-POV summary and edge summary update on scene close

tests/test_scene_close.py

@@ -87,6 +87,7 @@ def client(tmp_path, monkeypatch):
     #   3. state_update bot->you
     #   4. state_update you->bot
     #   5. detect_scene_close (runs AFTER assistant_turn — see turns.py)
+    #   6. summarize_scene (T27, runs only when scene-close fires)
     parse_canned = json.dumps(
         {"segments": [{"kind": "dialogue", "text": "hello"}]}
     )
@@ -101,6 +102,13 @@ def client(tmp_path, monkeypatch):
             "new_container_hint": "park",
         }
     )
+    pov_summary_canned = json.dumps(
+        {
+            "summary": "BotA noticed you leaving the office.",
+            "knowledge_facts": [],
+            "relationship_summary": "BotA wonders where you're headed.",
+        }
+    )
 
     from chat.web.kickoff import get_llm_client
 
@@ -111,6 +119,7 @@ def client(tmp_path, monkeypatch):
             state_update_canned,
             state_update_canned,
             scene_close_canned,
+            pov_summary_canned,
         ]
     )
     app.dependency_overrides[get_llm_client] = lambda: mock