Per review: the two latent upsert conflicts should be observable even where not
auto-fixed.
- bibkey collision (auto-suffixed) now logs a warning so a paper landing as
'BobenkoLutz2023a' instead of '…2023' isn't silent.
- openalex_id collision (two papers claiming the same OpenAlex work — a real data
conflict, not auto-renamable) now raises a clear ValueError naming the
openalex_id and the offending paper, instead of the raw psycopg UniqueViolation.
Regression test added for the openalex_id error path.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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