/brainstorm reworked into idea-shaping
- New job: shape one raw idea — investigate the need to its root, then propose a concrete form the user corrects — instead of diverging/converging a wide feature catalogue.
- AskUserQuestion end to end: every exchange (enquiry, proposed shape, go/no-go) runs through AskUserQuestion; the options carry the model's hypotheses, so each question both digs and contributes.
- Output: a 4-line shape (Intention / Form / Slice 1 / Out-of-scope) →
FEAT-*stub + a 2-line shaping body. Persona pain and value hypothesis are deduced silently. - Removed: the hard brief+persona gate — no more redirect to /define.
See CHANGELOG.md for full details.