plan-phase

Work breakdown for a plan — the current planning suite. Reads a Format: v2 plan.md, proposes an ordered phase list (noting in prose which phases are independent and which reconciles them), then writes one phase document per phase plus the checkbox execution.md tracker (never phases.md). UI phases get a spec item and a visual-verify gate box; every phase carries a compact evidence record. Use when the user invokes /plan-phase, or says "break this plan into phases", "WBS the plan", "create the execution.md tracker".