revert: remove CheckScopedForeignKey node type (replacing with scoped field design)

[pyramation]

Summary

Reverts the CheckScopedForeignKey node type registration from #1278. Restores DataDenormalized which was part of the same merge.

Why: The standalone CheckScopedForeignKey node type (requiring manual references[] configuration) is being replaced by a simpler scoped boolean on metaschema_public.field. The new design auto-generates validation triggers from field metadata without needing a separate node type entry.

DataDenormalized is preserved — it was incorrectly caught in the merge revert and is re-added in a follow-up commit.

Link to Devin session: https://app.devin.ai/sessions/12842f98263d4815b6713291efc825ad
Requested by: @pyramation

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