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test findMessageByFilename and explain its error causes master

Covers lookup by absolute and database-relative filename, null for unknown filenames, and XapianException on a closed database. The FindMessageError docs now explain that UpgradeRequired means the on-disk format predates filename lookup and what triggers a Xapian exception. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017i7R7ReKJAHGQpitxGXqrb


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