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A CSV merge now records each file's columns, and the build adds one view per file: File on Filter at that file's item, its own categories seated as a fresh import seats them, the rest on None, and other files' measures hidden. The merged Default view stays the initial view. The headless and wizard paths both carry the sources. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze