v1.7.3 — Add CITATION.cff for Zenodo archive integration
What's new
Adds a CITATION.cff describing librarian as research software, ahead of enabling Zenodo's GitHub archive integration on the repo. This is the first release that mints a Zenodo DOI for librarian; future releases will continue to archive automatically via the Zenodo webhook.
Other changes
tests/test_cli_read.py::test_versionnow reads the expected version from the repo-rootVERSIONfile rather than a hard-coded literal, so future version bumps don't break the test.VERSIONandpyproject.tomlboth bumped to 1.7.3 (the single-source-of-truth invariant documented inlibrarian/__init__.pyis preserved).
No application logic changes
This is a metadata-only release. The CLI, MCP server, and schema engine are unchanged from v1.7.2.
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