intake — collect inputs, scaffold the project

Starts a cap-evolve optimization run. Interviews the user to decide what capability to optimize, which runner/optimizer/algorithm to use, and where the tasks and the scoring source live, then scaffolds .capevolve/project/ (adapter stub, capevolve.yaml, PROJECT.md). Use when someone asks to optimize or improve an agent capability against an eval and no project exists yet — "set up a run", "start optimizing X", "make X score higher on this benchmark". This is Phase 1 of the pipeline. For every NEEDED input that is missing it asks the user — quoting the expected path, how to retrieve it, and the alternatives — instead of fabricating it. Not for a project that already exists:…