- CamlQuery with RecursiveAll scope enumerates files across all non-hidden document libraries
- Paginated 500-item batches avoid list view threshold issues
- Files grouped by extension (case-insensitive) with summed size and count
- Results returned as IReadOnlyList<FileTypeMetric> sorted by TotalSizeBytes descending
- Existing CollectStorageAsync, LoadFolderNodeAsync, CollectSubfoldersAsync unchanged
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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