validate-idealisted

Run the workflow in `workflows/idea-validation.md` end to end. Idea: $ARGUMENTS Entry conditions: - If `memory/user_profile.md` does not exist, run first-run onboarding first. - If the argument names an existing slug in `memory/ideas/`, validate that one. Otherwise create `memory/ideas/<slug>/idea.md` from the description. - The frontmatter must carry `business_model`. If who pays is not obvious, ask one question: consumers with their own card, or a business? Then set `status: in-validation`. Follow all ten steps. Do not shortcut the research: every competitor price, market size and channel cost needs a real source URL recorded in the file that uses it. Before presenting the memo: 1. Run `python tests/validate_memory.py --idea <slug>` and fix every ERROR. 2. Set `status: scored` and `validated_at` in `idea.md`. Present the memo in full. If the verdict is pivot or drop, offer `/pivot-idea <slug>`.