developer_attribute_initialize: Dot Product and Cross Product sources

Source gains Dot Product and Cross Product of Source Attribute and a
new Second Attribute, both vector point attributes. A Float or Integer
attribute takes the dot product, or the length of the cross product;
a Vector attribute takes the cross product, or the dot product in all
three components. Existing tabs are untouched: the items are appended
and the second attribute defaults empty, so the version stays 1.0.
Verified headlessly against Python for every type and source.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

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