Grill Site

Same relentless interview as /brief-site, but stateless: do not require a git repo and do not write docs/site/* unless the user explicitly asks to save somewhere.

Process

1. Run site-grilling on the site idea (audience, job-to-be-done, success action, constraints, out of scope, metrics, references). One question at a time; recommend answers.
2. When shared understanding is confirmed, summarise the brief in chat using the structure from brief-site's template.
3. Tell the user: once a repo exists and /setup-site-skills has run, re-run /brief-site to persist BRIEF.md and continue the main flow.