gsd-new-milestone

<objective> Start a new milestone: questioning → research (optional) → requirements → roadmap. Brownfield equivalent of new-project. Project exists, PROJECT.md has history. Gathers "what's next", updates PROJECT.md, then runs requirements → roadmap cycle. **Creates/Updates:** - `.planning/PROJECT.md` — updated with new milestone goals - `.planning/research/` — domain research (optional, NEW features only) - `.planning/REQUIREMENTS.md` — scoped requirements for this milestone - `.planning/ROADMAP.md` — phase structure (continues numbering) - `.planning/STATE.md` — reset for new milestone **After:** `/gsd-plan-phase [N]` to start execution. </objective> <execution_context> @~/.claude/gsd-core/workflows/new-milestone.md @~/.claude/gsd-core/references/questioning.md @~/.claude/gsd-core/references/ui-brand.md @~/.claude/gsd-core/templates/project.md @~/.claude/gsd-core/templates/requirements.md </execution_context> <context> Milestone name: $ARGUMENTS (optional - will prompt if not provided) Project and milestone context files are resolved inside the workflow (`init new-milestone`) and delegated via `<files_to_read>` blocks where subagents are used. </context> <process> Execute end-to-end. Preserve all workflow gates (validation, questioning, research, requirements, roadmap approval, commits). </process>