Fix issue 135 chat context bleed (#281)

* Fix issue 135 chat context bleed

* Guard task delivery metadata access

routes/session_routes.py

@@ -94,7 +94,6 @@ logger = logging.getLogger(__name__)
 
 router = APIRouter(prefix="/api", tags=["sessions"])
 
-
 def _current_user_is_admin(request: Request, user: str | None) -> bool:
     if not user:
         return False
@@ -142,6 +141,17 @@ def _persist_session_headers(session_id: str, headers: dict | None) -> None:
         db.close()
 
 
+_HIDDEN_SYSTEM_SESSION_NAMES = {
+    "[Task] Chat Sessions Tidy",
+    "[Task] Documents Tidy",
+    "[Task] Memory Tidy",
+    "[Task] Research Tidy",
+    "[Task] Email Mark Boundaries",
+    "[Task] Email Tags",
+    "[Task] Skills Audit",
+}
+
+
 def _pick_endpoint_for_sort(owner=None):
     """Pick model endpoint for auto-sort LLM call — uses utility endpoint setting, falls back to default."""
     from src.endpoint_resolver import resolve_endpoint
@@ -265,7 +275,8 @@ def setup_session_routes(session_manager: SessionManager, config: dict, webhook_
                      "message_count": msg_count_map.get(s.id, 0)}
                     for s in user_sessions.values()
                     if not s.archived
-                    and (s.name or "").strip() not in ("Nobody", "Incognito")]
+                    and (s.name or "").strip() not in ("Nobody", "Incognito")
+                    and (s.name or "").strip() not in _HIDDEN_SYSTEM_SESSION_NAMES]
 
         return sessions