Multi-owner calibration

Today the interview binds one person's judgment to a surface. At team scale, standards are held by a few people who don't always agree, and the system has no way to record two owners or resolve a conflict between them.

A binding that silently reflects one voice gets overridden in review by the other — which puts the calendar back in the loop, the exact thing the interview exists to remove.

Extend the interview to accept more than one profile per surface: run it per owner, diff the answers, surface disagreements as open questions for the owners to settle together, and persist the resolution as the single binding with a named tiebreaker.