finding-unknowns

Guide the user through a quadrant walk that maps the unknowns of a task — open by listing the known knowns, then work through known unknowns, unknown knowns, and unknown unknowns one stage at a time, ending with a complete four-quadrant map in the user's hands. Use when the user explicitly asks for a blindspot pass, unknown unknowns, "what am I missing / what should I be asking", a one-question-at-a-time interview, or several directions to react to; when ambiguity or unfamiliarity is high enough that building now would likely cause rework; when a reference implementation must be understood before porting; or for a named after-walk slice — implementation notes / deviations log, a buy-in doc, a quiz gate before merge, or a session handoff (run only that slice). Do not invoke for ordinary implementation of a sufficiently specified task.