Wire up query history: localStorage session persistence + sidebar UI

apps/ai-service/main.py

@@ -28,6 +28,7 @@ def create_app(
     conversational: Any | None = None,
     trace_writer: PostgresTraceRepository | None = None,
     metrics: Any | None = None,
+    section_retriever: Any | None = None,
 ) -> FastAPI:
     configured = settings or get_settings()
     effective_metrics = metrics or NullMetrics()
@@ -37,6 +38,12 @@ def create_app(
     app.state.conversational = conversational
     app.state.trace_writer = trace_writer
     app.state.metrics = metrics
+    # The raw Qdrant retriever, not routed through RagAgent — Feature-List
+    # #4/#23's section-list and verbatim-section-text endpoints are plain
+    # payload-filtered reads with no LLM/generation step, so nothing about
+    # them belongs on the answer/agent path. None whenever embedding is
+    # disabled (no Qdrant client exists at all in that mode).
+    app.state.section_retriever = section_retriever
 
     @app.middleware("http")
     async def correlate_and_trace(request: Request, call_next):
@@ -128,11 +135,14 @@ def _route_label(path: str) -> str:
 
 
 _settings = get_settings()
-_answer_service, _conversational, _trace_writer, _metrics = build_runtime(_settings)
+_answer_service, _conversational, _trace_writer, _metrics, _section_retriever = (
+    build_runtime(_settings)
+)
 app = create_app(
     settings=_settings,
     answer_service=_answer_service,
     conversational=_conversational,
     trace_writer=_trace_writer,
     metrics=_metrics,
+    section_retriever=_section_retriever,
 )