What is feature-branch?
Create a feature branch worktree as a sibling of the current project directory. TRIGGER when: user asks to create a branch, start a feature branch, or set up a worktree. Examples: "create a branch called add-user-export", "set up a worktree for fix-search". DO NOT TRIGGER when: user just wants to switch branches, view issues, or implement code. Source: smartworkx/dev-context.