* test: stabilize batch VCR coverage
* test: replay bedrock batch s3 uploads
* test: stop batch tests leaking live uploads
* test: keep bedrock batch workflow off live s3
* test: mock bedrock batch workflow network
* test: accept realtime guardrail refusal wording
* test: update gemini thought signature model
* test: quiet logging worker atexit flush
* test: address Greptile review on batch VCR fixes
Handle content= bodies in the bedrock batch post stub so payload
extraction does not raise a TypeError when a request omits json and
data. Restore litellm list state faithfully by preserving None instead
of coercing it to an empty list, so callbacks that start as None are not
turned into [] after a test. Set logging.raiseExceptions inside the try
block in the atexit flush so the finally always restores the previous
value.
* test: scope atexit logging suppression to the drain loop
Wrap only the queue drain loop in LoggingWorker._flush_on_exit with the
logging.raiseExceptions toggle so the process-wide global is suppressed for
the smallest possible window, keeping other threads' logging error reporting
intact outside the loop.
* test: cover atexit flush error-swallow branch in LoggingWorker
The _flush_on_exit drain loop was wrapped in a try/finally to scope the
logging.raiseExceptions toggle, which reindented the existing edge-case
branches into the diff and dropped patch coverage below target. Add a
regression test that enqueues a coroutine which raises during the atexit
flush and asserts the failure is swallowed while later queued events are
still drained, exercising the silent-failure path directly.
