Set the DSL direction and the text model

aup declares connections and leaves storage, transactions and screen models
to Pure. Interface vocabulary lives in Vega, an aup library, not in the
language. text is one immutable UTF-8 type from a word to a 1 MiB document;
positions are cursors bound to a value that stay on character boundaries and
follow edits, lengths name their unit, and comparison is exact without silent
normalization. Stages v0b-v0d and their acceptance tests are listed.

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