Declare outputs and send them: output ordered = message { ... }

An output is a message the app sends, with fields and groups as a
message has; send ordered { item: x, to: { city: y } } gives every
field once, in any order, groups in their own braces, and compiles to
Pure's SEND. Diagnostics cover a missing field, a group given a value,
an unknown field, a mistyped value, a send to a message, a handler for
an output, a field given twice and reading an output as a state; kinds
in messages now carry their article (an output, a key input).

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