Kiwix runs in library mode reading kiwix-library.xml via --monitorLibrary.
Today a missing or corrupt XML is only repaired on the download path
(rebuildFromDisk after a completed download), so if the file is lost or
truncated outside that flow — storage relocation, an interrupted write, manual
deletion — Kiwix comes up serving an empty library with no path to recovery.
Add KiwixLibraryService.ensureLibraryXmlHealthy(): reads the XML, and if it's
missing (ENOENT) or fails to parse / lacks a <library> root, rebuilds it from
the ZIM files on disk. A well-formed but empty library is treated as valid (no
spurious rebuild), and filesystem errors other than ENOENT are surfaced rather
than masked. The boot provider calls it on the already-in-library-mode path.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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