Replace the inline try/except at the end of _handle_receive_notification
with a small async context manager that swallows the exception, logs
self.logger.error with the offending payload's repr (bounded to 200 chars),
and attaches the traceback via logger.opt(exception=True).
The previous log line only carried `e`, so diagnosing a bad envelope from
production logs required correlating timestamps. The wrapper is generic so
future receive/dispatch sites can adopt it; for now only this site uses it.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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