fix(review): address Copilot follow-up on sanitizer and file decode errors

Consume multi-byte non-CSI ESC sequences during ANSI sanitization and handle UnicodeDecodeError for `hermes send --file` so review findings are resolved without regressions.

hermes_cli/send_cmd.py

@@ -59,7 +59,7 @@ def _read_message_body(
             return sys.stdin.read()
         try:
             return Path(file_path).read_text(encoding="utf-8")
-        except OSError as exc:
+        except (OSError, UnicodeDecodeError) as exc:
             print(f"hermes send: cannot read {file_path}: {exc}", file=sys.stderr)
             sys.exit(_USAGE_EXIT)