* fix: log meta backup offset errors
* fix: log meta backup offset errors
* fix: exit on meta backup offset errors
Exit with a non-zero status when the initial metadata backup offset cannot be persisted.
Classify offset-read failures during streaming so the backup process exits instead of retrying forever, allowing supervisors to restart and bootstrap from a missing checkpoint.
* meta backup: read offset in the loop, drop offset error type
Reading the saved offset inside the retry loop makes an offset read
failure a clean exit and a stream error a retry, without a typed error
to tell them apart. streamMetadataBackup now takes the start time.
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Co-authored-by: Chris Lu <chris.lu@gmail.com>
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