Audit and reorganize a messy directory with a dry-run-first planner: extension/date/size statistics, fast duplicate detection (size + first-1KB hash), and a reviewable move plan before anything touches disk. Use when the user asks to organize my files / file cleanup / find duplicate files / sort downloads folder / tidy directory / file archiving / batch organize. Do NOT use for deleting files, renaming in place, syncing between machines, or touching system/VCS directories.
