[eric] backend: unused imports and dead helpers swept

backend/apps/agents/manager/predict_prompts.py

@@ -34,7 +34,7 @@ def p_recent_topics(limit: int = MAX_TOPICS) -> List[str]:
     )
     topics: List[str] = []
     seen = set()
-    for _sid, d in data:
+    for _, d in data:
         name = (d.get("name") or "").strip()
         low = name.lower()
         if low in P_SKIP_NAMES or low in seen:

backend/apps/agents/ui_request_bridge.py

@@ -49,8 +49,3 @@ def respond_to_ui_request(session_id: str, component_id: str, response: Dict[str
     pending.response = response
     pending.event.set()
     return True
-
-
-@typechecked
-def has_pending_ui_request(session_id: str, component_id: str) -> bool:
-    return (session_id, component_id) in p_pending

backend/apps/help/bundle.py

@@ -13,7 +13,7 @@ import re
 import sys
 import time
 from contextlib import asynccontextmanager
-from typing import AsyncIterator, List, Optional
+from typing import AsyncIterator, List
 
 from pydantic import BaseModel, ConfigDict, Field
 from typeguard import typechecked

backend/tests/test_app_export_no_stale_files.py

@@ -4,7 +4,6 @@ exists. output.files is frozen at creation (v1); the agent edits land on disk
 imported app reverted every edited file (new files survived since they were never
 in the snapshot). With a workspace, disk is the single source of truth; only true
 flat apps (no workspace) still carry the inline copy."""
-import os
 import uuid
 
 import pytest

backend/tests/test_router_watchdog.py

@@ -4,10 +4,8 @@ evidence so a zero-config user never boots a router with nothing to route."""
 
 import asyncio
 import json
-import os
 from unittest.mock import patch
 
-import pytest
 
 import backend.apps.nine_router.process as proc
 from backend.apps.settings.models import AppSettings

backend/tests/test_spawn_agent.py

@@ -6,7 +6,7 @@ import asyncio
 import json
 import subprocess
 import sys
-from typing import Dict, List, Optional
+from typing import Dict, List
 
 from pytest import MonkeyPatch, raises
 

backend/tests/test_subscription_health.py

@@ -4,7 +4,7 @@ subscription lanes, and results are cached so a double boot-fetch can't double-s
 
 import asyncio
 import json
-from typing import Dict, List, Optional
+from typing import Dict, List
 
 import backend.apps.nine_router.subscription_health as sh
 

backend/tests/test_tool_manifest.py

@@ -3,7 +3,6 @@ FULL_TOOLS list that prunes dead preset built-ins WITHOUT dropping anything Open
 manifest MUST keep every built-in in effective_allowed's source set + ToolSearch (so deferred MCP
 loading survives); MCP tools ride mcp_servers, not this list."""
 
-import os
 
 from backend.apps.agents.manager.prompt.tool_catalog import (
     FULL_TOOLS,

backend/tests/test_ws_efficiency.py

@@ -6,7 +6,6 @@ clients backwards, and an open session in the history map had its terminal frame
 
 import asyncio
 
-import pytest
 from fastapi.testclient import TestClient
 
 from backend.apps.agents.core.ws_manager import ws_manager, slim_status_data