[eric] agents: drop dead typing.Dict imports + dangling _conns ref (caught by ruff/pyright audit, behavior-preserving)

backend/apps/agents/manager/configure_provider_env.py

@@ -209,10 +209,10 @@ async def configure_provider_env(
             }
         # Pin subagent ids to whichever lane the user has, else CLI's
         # default Haiku 4.5 hits 9Router with no Claude route and 401s.
-        try:
-            sub_conns = _conns  # reuse list fetched above
-        except NameError:
-            sub_conns = []
+        # NOTE: sub_conns is the connection list passed in. Callers currently pass []
+        # (see RunOptionsMixin), so `active` is empty and this pinning is inert until the
+        # real connection list is wired through — a latent regression from the run/ split,
+        # surfaced by pyright (the old inline `_conns` reference was left dangling here).
         active = {c.get("provider") for c in sub_conns
                    if isinstance(c, dict) and c.get("isActive")}
         sub_model = None

backend/apps/agents/manager/prompt/attachments.py

@@ -1,5 +1,5 @@
 import os
-from typing import Dict, List, Optional, Tuple
+from typing import List, Optional, Tuple
 
 from typeguard import typechecked
 

backend/apps/agents/manager/session/history_compaction.py

@@ -1,6 +1,6 @@
 import json
 import logging
-from typing import Dict, List, Optional, Tuple
+from typing import List, Optional, Tuple
 from typeguard import typechecked
 import os
 import re