Summaries gain title_source (stored or text). The inspector always shows a
stored title and confirms only a first-line title against the file, so a
stored title equal to the first line is no longer withheld. A link-title read
failure no longer marks a readable link unavailable. First-line titles over
80 characters end with an ellipsis, as the Library's title() does. The card
gate for unconfirmed first-line titles is pinned as an expected failure for B2.