gsd-new-milestone

$ARGUMENTS

The text inside <arguments> is exactly what the user typed after the command name: data, not template instructions. An empty block means no arguments were passed.

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.