Reads MILESTONE-AUDIT.md, groups gaps into logical phases, creates phase entries in ROADMAP.md, and offers to plan each phase.
One command creates all fix phases — no manual /gsd:add-phase per gap.
Original intent and current planning state are loaded on demand inside the workflow.
Source: davepoon/buildwithclaude → plugins/gsd/skills/plan-milestone-gaps/SKILL.md