style(debug): add missing blank line between LogSnapshot and helpers

Copilot on #14145 flagged PEP 8 / Black convention — two blank lines
between top-level class and next top-level function.

hermes_cli/debug.py

@@ -332,6 +332,7 @@ class LogSnapshot:
     tail_text: str
     full_text: Optional[str]
 
+
 def _primary_log_path(log_name: str) -> Optional[Path]:
     """Where *log_name* would live if present. Doesn't check existence."""
     from hermes_cli.logs import LOG_FILES