spec-handover

The format for handing over a spec agreed in the conversation as text the user pastes into the board's New spec form: the four parts (Prosjekt, Tittel, Beskrivelse, Avhengigheter), one fenced block each, what goes under Beskrivelse, and when a dependency may be named. Use when: a spec has been agreed in the conversation and its text is to be handed over, "skriv spec-teksten", "gi meg specen", proposing a new spec. Do NOT use for: creating the spec (`aide create`, and only when the user asks), analysing an existing spec (use aide-analyze).