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dataset.import refused every header cell that wasn't the name of a variable the document defines. A data source file could only fill variables made beforehand, and `#` and `@` in a header were read as part of a variable's name. A header cell that names no variable now defines a new, unbound variable in the import's undo step. `#Shown` defines a visibility variable `Shown`, `@Photo` defines an image variable `Photo`, and a cell without a prefix defines a text variable. A prefixed cell whose name is already a variable of the prefix's kind names it. A cell that is a variable's exact name keeps naming it, even when the name starts with `#`, `@` or `%`, so files that dataset.export writes import back as before. The import fails, naming the column, on a prefixed cell whose name is a variable of another kind and on a `%` cell that names no variable (graph data files). While the variables are locked, a header that would define a variable fails the import with "variables are locked", as New Variable does. The reply's `defined` lists the new variables. Docs: docs/mcp.md, docs/target-app-parity.md.