chore: fix ruff lint issues (import sorting, trailing whitespace)

headroom/evals/memory/runner_v2.py

@@ -15,9 +15,9 @@ from __future__ import annotations
 import asyncio
 import json
 import logging
+import tempfile
 import time
 import uuid
-import tempfile
 from collections.abc import Callable
 from dataclasses import dataclass, field
 from datetime import datetime

headroom/evals/memory/runner_v3.py

@@ -20,9 +20,9 @@ from __future__ import annotations
 import asyncio
 import json
 import logging
+import tempfile
 import time
 import uuid
-import tempfile
 from dataclasses import dataclass, field
 from datetime import datetime
 from pathlib import Path

headroom/rtk/installer.py

@@ -77,7 +77,7 @@ def download_rtk(version: str | None = None) -> Path:
         # Validate URL scheme to prevent B310 warning
         if not url.startswith(("http://", "https://")):
             raise ValueError(f"Invalid URL scheme in {url}")
-            
+
         # Try default SSL first, fall back to unverified for macOS framework Python
         try:
             with urlopen(url, timeout=30) as response: