41cef5399b4e2c97f61a0c4d3401f773743428a6
to and table independently optional in add column
Previously the grammar accepted only `to table` together or neither. The user-stated convention is that bare table identifiers are accepted in unambiguous positions (matching how `add 1:n relationship from <T>.<col> to <T>.<col>` takes bare table names). Both `to` and `table` are now or_not'd independently, so all four combinations parse identically. Updates the in-app `help` listing to advertise the new shape: `add column [to] [table] <T>: <col> (<type>)`. 3 new parser tests cover the variants.
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