v0.7.0

• Add afui ask: questions with suggested answers and room for the person's own words, returned as one result
• Put several questions on one page, with single or multiple choice and typed context blocks
• Attach a note to the chosen option; a written answer is a card of its own
• Add --detach and afui ask wait for callers whose commands time out
• Shorten a question's registry subject to its first line
• Name the field, never the value, in JSON argument errors
• Add Error::InvalidAsk and registry_opted_out()