feat!: Explicit Project outputs - #196
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Description
This PR adds compact and explicit output syntax for
Project.Compact output describes the final output directly:
Explicit output separates expressions added by Project from the mapping over its complete direct output:
A mapping that adds no expressions omits the empty
+>clause:Part of #34.
Changes
_.=>output, explicit+>additions, and|>mappings over the complete Project direct output.Project[_]becomes the canonical Direct passthrough form.API impact
Project[$0, expression]are no longer accepted. WriteProject[_ => $0, expression]for compact output.Project[_]now represents Direct passthrough. UseProject[_ => _]for anempty final output.