Add check_oserror() method to ResolutionManager with an extensible
errno-to-unhealthy-reason mapping. Replace ~20 inline
`if err.errno == errno.EBADMSG` checks across 14 files with a single
call to self.sys_resolution.check_oserror(err). This makes it easy to
add handling for additional filesystem errors (e.g. EIO, ENOSPC) in
one place.
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
c0cca1ff8b