<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>
@${CLAUDE_PLUGIN_ROOT}/workflows/new-milestone.md
@${CLAUDE_PLUGIN_ROOT}/references/questioning.md
@${CLAUDE_PLUGIN_ROOT}/references/ui-brand.md
@${CLAUDE_PLUGIN_ROOT}/templates/project.md
@${CLAUDE_PLUGIN_ROOT}/templates/requirements.md
</execution_context>
<context>
Milestone name: $ARGUMENTS (optional - will prompt if not provided)
Project and milestone context files are resolved inside the workflow (init new-milestone) and delegated via <files_to_read> blocks where subagents are used.
</context>
<process>
Execute the new-milestone workflow from @${CLAUDE_PLUGIN_ROOT}/workflows/new-milestone.md end-to-end.
Preserve all workflow gates (validation, questioning, research, requirements, roadmap approval, commits).
</process>