compute_diff is a pure function over matches + collection items: new
games land in to_add.csv (carrying a confident version when matching
produced one); owned version-less entries with version_auto/approved
matches produce additive to_update.csv rows keyed by collid, consuming
distinct collids when photos show two editions; entries that already
carry a version are never touched — disagreements are reported in the
summary. Unseen collection entries are listed informationally. Live API
mode activates when BGG_API_TOKEN + username exist; otherwise the two
hand-pulled snapshot XMLs (real 2018 collection, 79 unique copies after
collid dedupe) are used, and they double as parsing fixtures in tests.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Eric Wagoner
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