style: restore PEP8 blank-line separation after dead-code removal

The deletions in the salvaged commit left some top-level defs/classes
separated by a single blank line. Restore the 2-blank-line separation.

tools/computer_use/cua_backend.py

@@ -76,6 +76,8 @@ _ELEMENT_LINE_RE = re.compile(
 
 def _is_macos() -> bool:
     return sys.platform == "darwin"
+
+
 def cua_driver_binary_available() -> bool:
     """True if `cua-driver` is on $PATH or HERMES_CUA_DRIVER_CMD resolves."""
     return bool(shutil.which(_CUA_DRIVER_CMD))

tools/file_operations.py

@@ -111,6 +111,8 @@ def _normalize_line_endings(text: str, target: str) -> str:
     if target == "\r\n":
         return lf_normalized.replace("\n", "\r\n")
     return text
+
+
 def _is_write_denied(path: str) -> bool:
     """Return True if path is on the write deny list."""
     return _shared_is_write_denied(path)

tools/skills_tool.py

@@ -627,6 +627,8 @@ def _find_all_skills(*, skip_disabled: bool = False) -> List[Dict[str, Any]]:
 def _sort_skills(skills: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
     """Keep every skill listing path ordered the same way."""
     return sorted(skills, key=lambda s: (s.get("category") or "", s["name"]))
+
+
 def skills_list(category: str = None, task_id: str = None) -> str:
     """
     List all available skills (progressive disclosure tier 1 - minimal metadata).