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The milestone becomes the plan container: a new nullable milestones.body holds the design/intent (Goal/Approach/Verification) and individual steps live as first-class child tasks (milestone_id) instead of checkboxes crammed into one kind=plan task body. start_planning now creates a MILESTONE seeded with the body template (not a kind=plan task) and returns it with applicable rules; a new get_milestone MCP tool reads the plan back (body + steps + rules). kind=plan is hard-retired going forward — start_planning never creates one. The 'plan' task_kind enum value stays valid so the 11 historical plan-tasks remain readable in place; no body-shredding backfill (corpus review showed auto-splitting their checklists into tasks would be lossy: embedded code blocks, a non-binary [~] state, tables, ID-encoded hierarchy). - migration 0066: add milestones.body - model/service/route/MCP: body passthrough on create+update; get_milestone - server _INSTRUCTIONS: "plan" = milestone w/ body + child step-tasks - UI: ProjectView shows/edits a milestone's plan body; start_planning expands the new milestone and opens its plan editor - tests updated to the milestone contract + new body/get_milestone coverage Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>