Librarian.__init__ reads the Crossref contact from CONJURER_CROSSREF_MAILTO,
then tries to override it from a 'crossref' netrc entry. When no netrc is
mounted (the normal container setup - default /root/.netrc) the read raises
FileNotFoundError and it logged 'Crossref credentials missing in netrc ...'
on EVERY search, even though the env var was set and used. Pure noise.
Only warn when there is genuinely no contact from either source (env unset
AND netrc unreadable) - which is also the case that then raises. When the
env var is set, a missing netrc is expected and logged at debug.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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