Small bbl-validation helper for the interviews paper bibliography. Reads
paper.bbl, extracts each bibitem's rough title, queries CrossRef, and
prints [OK] / [WARN] / [ERR] per citation key. Useful as a spot-check
after large bibliography edits to catch typos, wrong years, or silently-
renamed works.
Placed alongside the other paper-tooling (analyze_corpus.py,
generate_figures.py, generate_macros.py). Path resolution uses
Path(__file__).parent so it works from any CWD.
