Cs Feat

This is a router that figures out which sub-skill to invoke when you want to add a new feature. It doesn't write code or docs itself. Instead it checks what artifacts already exist in `.codestable/features/`, then sends you to the right step: brainstorming if your idea is fuzzy, design if you know what you want, fastforward for small clear tasks, implementation if the design is approved, or acceptance when code is done. The whole point is preventing AI from jumping straight from vague idea to code, which causes naming mismatches, scope creep, and no documentation trail. It enforces human checkpoints between phases so you don't discover the AI misunderstood your intent only after it's written everything.