Q-named category pages sharing a QID across 2+ categories. The ~621 historical figure long drained; resolve_double_category_qids.py auto-handles same-target cases. What remains is the genuinely-different-target review tail.
detection error at build time: 403 Client Error: Forbidden for url: https://shinto.miraheze.org/w/api.php?action=query&list=categorymembers&cmtitle=Category%3ADouble+category+qids&cmtype=page&cmlimit=500&format=json&formatversion=2
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