developer_migrate: one node replaces float_migrate and vector_migrate

Developer Migrate is the push design of float_migrate made type-aware:
the amount sent is a vector, a float broadcast to all components, the
transfer is componentwise, and only a float is clamped to 0..1 at the
end. The vector node was still the old pull-and-average version, so a
vector spike is now moved one cell per step like a float one instead
of being diluted. The attribute parameter is attr, not float_attr, and
the tab menu entry sits under Developer.

Version 1.2 follows the 1.1 that was split into the two nodes.

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

 otls/sop_lsgalante.developer_float_migrate.1.1.hdalc  | Bin 15272 -> 0 bytes
 otls/sop_lsgalante.developer_migrate.1.2.hdalc        | Bin 0 -> 15430 bytes
 otls/sop_lsgalante.developer_vector_migrate.1.1.hdalc | Bin 13506 -> 0 bytes
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diff --git a/otls/sop_lsgalante.developer_vector_migrate.1.1.hdalc b/otls/sop_lsgalante.developer_vector_migrate.1.1.hdalc
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