Keep the Cell of a column checked, and let any column be read

[johanrd]

#202 defaults CellArgs to any so a column with cell args fits Column<DataType>, which the plugin helpers need. It also stops checking the Cell of every column written by hand:

// 4.0.0: ComponentLike<CellContext<Person>>  — @row and @column required
// main:  ComponentLike<any>                  — any args, none required
type Cell = Column<Person>['Cell'];

In cells-test.gts on main, both @glint-expect-error directives report as unused: rendering a Cell with no args at all is no longer an error. Here they are consumed again.

Both properties hold if the Cell is read through a type whose [Invoke] is a method. ComponentLike declares it as a property, and the parameters of a property function are contravariant — hence the any. Method parameters are compared bivariantly, so such a column fits a parameter that names no args, while the args are still checked where the Cell is rendered.

ColumnConfig.Cell keeps ComponentLike, so a Cell is still checked against its column's meta and the table meta. Only the read side, Column.Cell, changes. The default goes back to unknown, the plugin helpers are untouched, and takesAnyColumn / takesAnyTable pass unchanged.

Cowritten by Claude