Iterate from user

Source: the user — directly, or via something they've pointed at (article, issue, spec, repo). Output: a user-confirmed Proposal block, handed back to iterate-ml-experiment.

Output contract (read this before the body)

This skill never writes journal/ files and never authors acceptance criteria. It returns a single Proposal block as conversation text (full shape in § What is returned at the bottom): Question, Motivation (with Source field — quote, URL, or path), Method outline, Open gaps. Required, in every branch: