`_read_json_file` caught OSError but not UnicodeDecodeError, so a status
file holding binary/non-UTF-8 bytes (truncated or clobbered write) would
crash the gateway status path instead of being treated as unreadable.
UnicodeDecodeError is a ValueError subclass, not an OSError, so it
escaped the existing guard.
Widen the catch to (OSError, UnicodeDecodeError) at both read sites in
gateway/status.py — `_read_json_file` and the sibling `_read_pid_record`,
which had the identical gap. Adds tests covering binary input (returns
None) and valid input (still parses) for both.
Co-authored-by: Teknium <127238744+teknium1@users.noreply.github.com>
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