fix(labeler-pro): write patch via sandbox.open() to avoid ARG_MAX, pre-load dataset

Replace heredoc-based patch upload with _write_sandbox_file() (sandbox.open())
to avoid hitting the 65536-byte ARG_MAX limit on large repo diffs (protonmail,
flipt-io). Also remove now-unused os/tempfile imports.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: andre15silva

src/labeling/swebench_pro_labeler.py

@@ -10,8 +10,6 @@
 from __future__ import annotations
 
 import json
-import os
-import tempfile
 from pathlib import Path
 from typing import Any, Dict, List, Optional
 
@@ -75,21 +73,9 @@ def _apply_patch_in_sandbox(sandbox: Any, patch: str, base_commit: str) -> bool:
     if not patch.strip():
         return True
 
-    with tempfile.NamedTemporaryFile(mode="w", suffix=".patch", delete=False) as f:
-        f.write(patch)
-        patch_local = f.name
-
-    try:
-        with open(patch_local) as pf:
-            content = pf.read()
-        upload = f"cat > /tmp/edit.patch << 'PATCHEOF'\n{content}\nPATCHEOF"
-        r = _exec_in_sandbox(sandbox, upload, timeout=30)
-        if r["returncode"] != 0:
-            return False
-        r = _exec_in_sandbox(sandbox, "cd /app && git apply /tmp/edit.patch", timeout=30)
-        return r["returncode"] == 0
-    finally:
-        os.unlink(patch_local)
+    _write_sandbox_file(sandbox, "/tmp/edit.patch", patch)
+    r = _exec_in_sandbox(sandbox, "cd /app && git apply /tmp/edit.patch", timeout=30)
+    return r["returncode"] == 0
 
 
 def _run_pro_eval(