Address code review: move imports to module level

Agent-Logs-Url: https://github.com/FastLED/fbuild/sessions/565e62a0-9fa2-4594-b7b0-0ef03f2489b9

Co-authored-by: zackees <6856673+zackees@users.noreply.github.com>

Author: Copilot

src/fbuild/packages/framework_esp32.py

@@ -48,6 +48,7 @@
 
 import _thread
 import json
+import zipfile
 from pathlib import Path
 from typing import Any, Dict, List, Optional
 
@@ -257,8 +258,6 @@ def _download_and_extract_to_temp(name: str, url: str, desc: str) -> tuple[str,
                     if self.show_progress:
                         print(f"Extracting {desc}...")
                     if archive_name.endswith(".zip"):
-                        import zipfile
-
                         with zipfile.ZipFile(archive_path, "r") as zf:
                             zf.extractall(temp_dir)
                     else:

tests/unit/packages/test_framework_archive_formats.py

@@ -8,6 +8,7 @@
 """
 
 import io
+import os
 import tarfile
 import zipfile
 from pathlib import Path
@@ -21,8 +22,6 @@
 
 def _create_tar_xz_archive(archive_path: Path, content_dir_name: str = "framework") -> None:
     """Create a valid .tar.xz archive with a single top-level directory."""
-    import os
-
     with tarfile.open(archive_path, "w:xz") as tar:
         # Create a directory entry
         dirinfo = tarfile.TarInfo(name=content_dir_name)
@@ -39,8 +38,6 @@ def _create_tar_xz_archive(archive_path: Path, content_dir_name: str = "framewor
 
 def _create_tar_gz_archive(archive_path: Path, content_dir_name: str = "framework") -> None:
     """Create a valid .tar.gz archive with a single top-level directory."""
-    import os
-
     with tarfile.open(archive_path, "w:gz") as tar:
         dirinfo = tarfile.TarInfo(name=content_dir_name)
         dirinfo.type = tarfile.DIRTYPE
@@ -55,8 +52,6 @@ def _create_tar_gz_archive(archive_path: Path, content_dir_name: str = "framewor
 
 def _create_zip_archive(archive_path: Path, content_dir_name: str = "framework") -> None:
     """Create a valid .zip archive with a single top-level directory."""
-    import os
-
     with zipfile.ZipFile(archive_path, "w") as zf:
         zf.writestr(f"{content_dir_name}/package.json", os.urandom(4096).hex())