<objective Review all 999.x backlog items and optionally promote them into the active milestone sequence or remove stale entries. </objective <process 1. List backlog items: 2. Read ROADMAP.md and extract all 999.x phase entries: Show each backlog item with its description, any accumulated context (CONTEXT.md, RESEARCH.md), and creation date. 3. Present the list to the user via AskUserQuestion: - For each backlog item, show: phase number, description, accumulated artifacts - Options per item: Promote (move to active), Keep (leave in backlog), Remove (delete) 4. For items to PROMOTE: - Find th…