fix: remove unused imports and em dash in nodes.py scaffold

- Drop unused StreamingResponse import from app/nodes.py (will be
  re-added in Task 2 when the SSE endpoint is implemented)
- Replace em dash with colon in _get_ollama_url HTTPException detail
- Remove unused os and unittest.mock imports from test_nodes.py
  (mock imports will return in Task 2 tests)

app/nodes.py

@@ -16,7 +16,6 @@ from urllib.parse import urlparse
 
 import yaml
 from fastapi import APIRouter, HTTPException
-from fastapi.responses import StreamingResponse
 
 logger = logging.getLogger(__name__)
 
@@ -98,7 +97,7 @@ def _get_ollama_url(node_id: str) -> str:
             return f"{parsed.scheme}://{parsed.hostname}:11434"
     raise HTTPException(
         status_code=404,
-        detail=f"Cannot determine Ollama URL for node {node_id} — no agent_url in profile",
+        detail=f"Cannot determine Ollama URL for node {node_id}: no agent_url in profile",
     )
 
 

tests/test_nodes.py

@@ -1,9 +1,7 @@
 """Tests for app/nodes.py — /api/nodes-mgmt/* endpoints."""
 from __future__ import annotations
 
-import os
 from pathlib import Path
-from unittest.mock import MagicMock, patch
 
 import pytest
 import yaml