Use when a task is about to change files tracked by Git, before the first edit, and when finished work has to reach the base branch. Especially when another agent, another pane, or the user is working in the same repository, when the checkout already has uncommitted changes, when several tasks run in parallel, or when a request sounds urgent ("be quick", "just fix it here", "small change"). Also use when rebasing a task branch, deciding who may merge, or removing a finished worktree. Triggers include "fix this", "add this feature", "hand this off", "merge my branch", "another agent is working in this repo", "워크트리", "브랜치 따서", "합쳐줘".
