Plan Feature

Creates a detailed feature plan document through an interactive process of clarifying questions and iterative refinement.

CRITICAL RULES

ALWAYS START WITH A NEW BRANCH - Before doing anything else, checkout main, pull, and create feature/plan-<feature-name> branch
NEVER IMPLEMENT - This skill is for PLANNING ONLY. Do not write any code, create any scenes, or modify any game files.
OUTPUT IS A PLAN FILE - The only file you create is plans/features/<feature-name>.md
DONE WHEN FILE IS WRITTEN - Once the plan file is committed, your task is COMPLETE. Stop immediately.

Plan a new feature:

<feature description>